KH 6493 EN
Translation of original instructions

KH 6493 EN

TROVIS 6493 Compact Controller

Firmware version 4.03
Edition August 2021

Notes on this configuration manual
The documentation for TROVIS 6493 Compact Controller is divided into two parts:− Mounting and Operating Instructions u EB 6493
− Configuration Manual KH 6493
This Configuration Manual KH 6493 is intended for qualified personnel with experience incontrol engineering. The control options determined by the functions and parameters selected
are listed in detail.
It is assumed that users are familiar with the operation of the device, i.e. know how to selectand change a function or parameter. If necessary, refer to EB 6493. The Mounting and Operating Instructions EB 6493 describe the installation, electrical wiring and operation of thecontroller.
Note
The default setting of functions and parameters is printed in bold in the following sections.
Functions of TROVIS 6493 Compact Controller
All functions of the configuration and parameter level are described in this Configuration
Manual. The configuration level has nine menus assigned to functions and their parameters:
Each one of the nine menus contains the functions for a certain topic:
−
−
−
−
−
−
−
−
−

PAR:
IN:
SETP:
CNTR:
OUT:
ALRM:
AUX:
TUNE:
I-O:

Control parameters
Input
Set point
Controller
OutputLimit relay
Additional functions
Start-up adaptation
Process data

A list of menus, functions and parameters is available in u EB 6493.
"-CO-" on the display indicates a function and "-PA-" the parameter level.

2

KH 6493 EN

Functions of the binary input BI1− SETP menu
− SETP menu
− CNTR menu

-CO- SP.FU/RAMP-CO- SP.FU/CH.SP-CO- AC.VA

−
−
−
−
−

-CO- SAFE-CO- MA.AU-CO- RAMP-CO- BLOC-CO- B.OUT

OUT menu
OUT menu
OUT menu
OUT menu
OUT menu

KH 6493 EN

Start set point ramp (see section 3.2)
Switch between set points (see section 3.2)
Increase/decrease process variable (see section 4.8)
Activate constant output value (see section 5.1)
Manual/automatic switchover (see section 5.2)
Start output ramp (see section 5.4)
Blocking output variable (see section 5.5)
Activate binary outputs (see section 5.11)

3

4

KH 6493 EN

Contents

1

PAR menu: Control parameters.......................................................................7

2
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8

IN menu: Input...............................................................................................9-CO- IN1:
Input signal IN1.............................................................9-CO- IN2:
Input signal IN2...........................................................10-CO- MEAS:
Signal monitoring.........................................................10-CO- MAN:
Switch to manual mode in case of signal failure..............11-CO- CLAS:
Assignment of X and WE to analog inputs.....................12-CO- DI.FI:
Filtering of X and WE...................................................12-CO- SQR:
Root extraction of X and WE.........................................13-CO- FUNC:
Function generation of X and WE..................................13

3
3.1
3.2
3.2.1
3.2.2

SETP menu: Set point....................................................................................16-CO- SP.VA:
Set point adjustment.....................................................18-CO- SP.FU:
Set point functions........................................................19-CO- SP.FU/RAMP
Set point ramp.............................................................19-CO- SP.FU/CH.SP Set point switchover by binary input BI...........................23

4
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8

CNTR menu: Controller.................................................................................25-CO- C.PID:
Control algorithm.........................................................25-CO- SIGN:
Inversion error Xd........................................................28-CO- D.PID:
Assignment of the D element (control output)..................28-CO- CH.CA:
Control mode selection P(D)/PI(D)..................................28-CO- M.ADJ:
Operating point setting (manual mode) for YPID.............30-CO- DIRE:
Direction of action of the output variable........................31-CO- F.FOR:
Feedforward control.....................................................31-CO- AC.VA:
Increase/decrease process variable...............................33

5
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
5.11

OUT menu: Output.......................................................................................34-CO- SAFE:
Activate constant output value.......................................34-CO- MA.AU:
Manual/automatic switchover.......................................34-CO- Y.LIM:
Control signal limitation YPID........................................36-CO- RAMP:
Output ramp/output rate limitation YPID........................36-CO- BLOC:
Blocking output variable YPID........................................38-CO- FUNC:
Function generation of the output variable......................40-CO- Y.VA:
Signal range for analog output Y...................................40-CO- Y.SRC:
Source for analog output Y...........................................41-CO- CALC:
Mathematical adaptation analog output Y......................41-CO- C.OUT:
Two-step or three-step output.........................................42-CO- B.OUT:
Binary outputs BO1 and BO2 for status indication..........54

KH 6493 EN

Contents

6
6.1
6.2

ALRM menu: Limit relays...............................................................................55-CO- LIM1:
Limit relay L1...............................................................57-CO- LIM2:
Limit relay L2...............................................................58

7
7.1
7.2
7.3
7.4
7.5
7.6

AUX menu: Additional functions....................................................................59-CO- RE.CO:
Restart conditions after power failure.............................59-CO- ST.IN:
Reset to default settings.................................................59-CO- KEYL:
Lock control keys..........................................................60-CO- VIEW:
Top/bottom viewing angle of display.............................60-CO- FREQ:
Power line frequency (ripple filter)..................................61-CO- DP:
Decimal separator setting..............................................61

8

TUNE menu: Start-up adaptation...................................................................62

9
9.1
9.2
9.3
9.4
9.5

I-O menu: Process data.................................................................................62-CO- CIN:
Firmware version..........................................................62-CO- S-No:
Serial number..............................................................62-CO- ANA:Show analog inputs and outputs....................................63-CO- BIN:
Show binary inputs and outputs....................................63-CO- ADJ:
Calibration of analog inputs and analog output..............63

10
10.1
10.2
10.3

Sample applications.....................................................................................63
Temperature control ..................................................................................63
Pressure control..................................................................................68
Abbreviations..................................................................................72

KH 6493 EN

PAR menu: Control parameters

1 PAR menu: Control parameters
This menu does not include any functions. As soon as this level is opened, the controller immediately jumps to the parameter level -PA- to give quick access to the control parameters.
Note
The control parameters can also be set in the CNTR menu in the C.PID function (see section 4.1).
PAR
KP

Proportional-action coefficient[0.1 … 1.0 … 100.0]

TN

Reset time

[1 … 120 … 9999 s]

TV

Derivative-action time

[1 … 10 … 9999 s]

Y.PRE

Operating point[–10.0 … 0.0 … 110.0 %]KH 6493 EN

7

8

D

D

MEAS

MAN

Measuring range
monitoring

IN2

A

IN1

A

IN

IN2

IN1

I–O

CLAS[X]

CLAS[WE]

X

WE

Input
assignment

DI.FI[X]F

DI.FI[WE]F

SQR[X]X

SQR[WE]

WE

Dig. filter Root extraction

IN

CO.VA

WE.VA

I–O

FUNC[X]FUNC[WE]

Function generation

IN

LIM2
LIM2[L2.X]

LIM1[L1.X]

LIM2[L2.WE]

LIM2

LIM1

LIM1[L1.WE]

LIM1

ALRM

PAR menu: Control parameters

Fig. 1: IN menu

KH 6493 EN

IN menu: Input

2 IN menu: Input
The analog inputs (IN1, IN2) are set in the IN menu.

2.1 -CO- IN1:

Input signal IN1

This function is used to set the input signal and measuring range of the analog input IN1.
PAR

-CO- IN1

Input signal IN1

0–20 mA

0 to 20 mA

4–20 mA

4 to 20 mA

0–10 V

0 to 10 V

2–10 V

2 to 10 V

100 PTPt 100 (–100 … 500 °C)

Resistance values u EB 6493

1000 PT

Pt 1000 (–100 … 500 °C)

Resistance values u EB 6493

100 NINi 100 (–60 … 250 °C)

Resistance values u EB 6493

1000 NINi 1000 (–60 … 250 °C)

Resistance values u EB 6493

0–1 KOHM

0 to 1000 Ω-PA- IN1
 IN1

Lower measuring range value[–999.0 … 0.0 …  IN1]

 IN1

Upper measuring range value[ IN1 … 100.0 … 9999]

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9

IN menu: Input

2.2 -CO- IN2:

Input signal IN2This function is used to set the input signal and measuring range of the analog input IN2.
IN

-CO- IN2

Input signal IN2

0–20 mA

0 to 20 mA

4–20 mA

4 to 20 mA

0–10 V

0 to 10 V

2–10 V

2 to 10 V

100 PTPt 100 (–100 … 500 °C)

Resistance values u EB 6493

1000 PT

Pt 1000 (–100 … 500 °C)

Resistance values u EB 6493

100 NINi 100 (–60 … 250 °C)

Resistance values u EB 6493

1000 NINi 1000 (–60 … 250 °C)

Resistance values u EB 6493

0–1 KOHM

0 to 1000 Ω-PA- IN2
 IN2

Lower measuring range value[–999.0 … 0.0 …  IN2]

 IN2Upper measuring range value[ IN2 … 100.0 … 9999]

2.3 -CO- MEAS:

Signal monitoring

This function is used to monitor the signal range of the analog inputs IN1 and IN2 for limit
violations.
When the signal leaves the rated signal range, the fault alarm output (BO3) is activated andthe alarm icon
appears on the display. Additionally, a reading on the display blinks to indicate:− '__o1':Upper limit violation of rated signal range at analog input IN1 or at analog
inputs IN1 and IN2− '__u1':

Lower limit violation of rated signal range at analog input IN1 or at analog
inputs IN1 and IN2− '__o2':Upper limit violation of rated signal range at analog input IN2− '__u2':Lower limit violation of rated signal range at analog input IN2

10

KH 6493 EN

IN menu: Input

Note
The controller can be configured to switch to manual mode after a signal range violation isdetected (see section 2.4).
IN-CO- MEAS

Signal monitoringoFF ME.MOOFF

IN1 ME.MO

Analog input IN1IN2 ME.MO

Analog input IN2

ALL ME.MO

Analog inputs IN1 and IN2

2.4 -CO- MAN:

Switch to manual mode in case of signal failureThis function is used to automatically change the controller to the manual mode
after signal range violation when the signal monitoring is active (-CO- MEAS ≠ oFF ME.MO).
− F01 FAIL setting:

The controller changes to manual mode. The constant output value
Y1K1 is issued. The constant output value Y1K1 is not active unless the controller was in automatic mode at the time when thesignal range violation occurred.

− F02 FAIL setting:

The controller switches to manual mode. The last output value isissued.

The output value can be changed in manual mode with the cursor keys ( and ). The
controller can only switch back to automatic mode again after the signal range violation
stops.
IN-CO- MAN

Switch to manual mode in case of signal failure

oFF FAILOFF

F01 FAIL

With constant output value Y1K1

F02 FAIL

With last output value-PA- MAN
Y1K1

KH 6493 EN

Constant output value[–10.0 … 110.0 %]11IN menu: Input

Note
The Y1K1 parameter can also be set in the -CO- SAFE and -CO- RE.CO functions (see section 5.1 and section 7.1).

2.5 -CO- CLAS:

Assignment of X and WE to analog inputs

The controller operates internally with the input variables X and WE. This function is used toassign the input variables to the analog inputs IN1 or IN2. By default, X is assigned to analog input IN2 and WE to analog input IN1.
IN

-CO- CLAS

Assignment of X to analog inputs

In2 X

X = IN2

In1 X

X = IN1
Assignment of WE to analog inputs

In1 WE

WE = IN1

In2 WE

WE = IN2

2.6 -CO- DI.FI:

Filtering of X and WEThis function is used to filter the input variables X and/or WE.
The first-order filter (low-pass filter or Pt1 behavior) smoothens the selected signals and suppresses input signal interferences of a higher frequency. The time constant of the Pt1 element
is defined by the parameters TS.X for the input signal X and TS.WE for the input signal WE.
IN-CO- DI.FI

Filtering input variable X

oFF X

OFF

on X

ON

TS/X

Time constant X filter[0.1 … 1.0 … 100.0 s]

Filtering input variable WE

12oFF WE

OFF

on WE

ON

TS.WE

Time constant WE filter[0.1 … 1.0 … 100.0 s]

KH 6493 EN

IN menu: Input

2.7 -CO- SQR:

Root extraction of X and WEThis function is used to calculate the square root of the input variable and standardized it internally to 0 to 100 %: X' = 10 · √X and WE' = 10 · √WE.
The root extraction is used for flow rate measurement using an orifice plate assembly to calculate the flow rate from the measured differential pressure.
IN-CO- SQR

Root extraction input variable X

oFF X

OFF

on X

ON
Root extraction input variable WEoFF WE

OFF

on WE

ON

2.8 -CO- FUNC:

Function generation of X and WE

The function generation of the input signal causes it to be revaluated for further processing.
Function generation allows auxiliary, reference or equivalence variables, inherent in measurement or industrial processes, to be adapted for the control circuit or to perform a linearization if the correlation between the input signal and the output signal required is known(i.e. due to scientific laws, empirical data or measured data). This could be correlation between steam pressure and temperature, for example.
Seven coordinates exist for function generation. Each coordinate is defined by an input value
and an output value.
− The values are entered as absolute values (e.g. in °C or bar).
− The MIN and MAX parameters are used to determine the measuring range of the output
signal E’. Provided K1.Y or K7.Y do not match MIN and MAX, the output values for thefunction-generated signal, which are below or above these limits, are constantly set toK1. Y or K7.Y.
− The controller completes the polygonal curve by generating straight lines (see Fig. 2). If
an output value is entered to be greater than MAX or smaller than MIN, it is fixed to thevalue of MAX or MIN. An example for using function generation can be found in section 10.

KH 6493 EN

13

IN menu: Input

E'
MAX
K7.Y
E

E'

K5.Y

K1.Y
MIN
K1.X

K5.X K6.X K7.X

MIN

Lower output signal
measuring range value

MAX

Upper output signal
measuring range value

K1.Y

Output value 1

K5.Y

Output value 5

K7.Y

Output value 7

K1.X

Input value 1

K5.X

Input value 5

K6.X

Input value 6

K7.X

Input value 7

E

Signal (e.g. input
signal) that is to beprocessed throughfunction generation

E'

Signal (e.g. output
signal) that has beenprocessed throughfunction generation

E

Fig. 2: Function generation

Note− We recommend either drawing up a table or creating a curve in a Cartesian coordinate
system. Choose the seven points in such a way that a curve can easily be created. The controller calculates the straight lines between adjacent points. Seven points must be specified
even if the signal curve can be sufficiently characterized by less points. If necessary, thefirst two or last two points can have the same values.
− The course of the polygonal curve is not limited by the software. Polygonal curves withmore than one maximum or minimum are possible. However, make sure that only one output value is assigned to an input value. Otherwise, a clear assignment of the input signal is
not achieved.

14

KH 6493 EN

IN menu: Input

IN-CO- FUNC

Function generation input variable X

oFF X

OFF

on X

ON

-PA- FUNC/X
MIN

Lower measuring range value Output [–999.0 … 0.0 … MAX]signalMAX

Upper output signal measuring range [MIN … 100.0 … 9999]
value

K1.X

Input value 1[ IN1 …  IN1;  IN2 …  IN2]

K1.Y

Output value 1[MIN … MAX]

…

…

…

K7.X

Input value 7[ IN1 …  IN1;  IN2 …  IN2]

K7.Y

Output value 7[MIN … MAX ]Function generation input variable WEoFF WE

OFF

on WE

ON

-PA- FUNC/WE
MIN

Lower measuring range value Output [–999.0 … 0.0 … MAX]signalMAX

Upper output signal measuring range [MIN … 100.0 … 9999]
value

K1.X

Input value 1[ IN1 …  IN1;  IN2 …  IN2]

K1.Y

Output value 1[MIN … MAX]

…

…

…

K7.X

Input value 7[ IN1 …  IN1;  IN2 …  IN2]

K7.Y

Output value 7[MIN … MAX ]KH 6493 EN

15

SETP menu: Set point

3 SETP menu: Set point
The functions for the set point are determined in this menu. The compact controller has twointernal set points W and W2 as well as an external set point WE.

16

KH 6493 EN

I–O

FE.CO

KH 6493 EN
W/W2/WE
SP.VA

SP.FU

W2

W2

CH.SP

W

W

BI

WE

WE

Select set point

SETP

SP.FU

RAMP

Set point
ramp

SP.CO

I–O

SETP menu: Set point

Fig. 3: SETP menu

17

SETP menu: Set point

3.1 -CO- SP.VA:

Set point adjustment

This function is used to activate the set point W2 or WE. The internal set point W is always
activated. The set point and the associated measuring range are set in the parameter level.
The measuring range ( WINT,  WINT) must match the measuring range of the controlled
variable X ( IN1,  IN1 or  IN2,  IN2) or the output range (MIN, MAX) when function
generation is used. The internal set points W and W2 can be adjusted within the lower andupper range values ( WRAN,  WRAN).
Function of the input variable WE:− on WE setting: WE is used as an external set point.
− F01 WE setting: WE is used with a three-step output for external position feedback (seesection 5.10). WE is not displayed in the operating level when this setting is used. Reading only appears in the I-O menu (see section 9.3).
− F02 WE setting: WE is used for feedforward control (see section 4.7). WE is not displayed in the operating level when this setting is used. Reading only appears in the I-O
menu (see section 9.3).
SETP-CO- SP.VA

Internal set point W

on W

ON

-PA- SP.VA/W
W

Internal set point WINT

Lower measuring range value W/W2[–999.0 … 0.0 …  WINT] WINT

Upper measuring range value W/
W2[ WINT … 100.0 … 9999]

 WRAN

Lower adjustment limit W/W2

[ WINT … 0.0 …  WRAN]

 WRAN

Upper adjustment limit W/W2

[ WRAN … 100.0 …  WINT][ WRAN … 0.0 …  WRAN]

Internal set point W2
oFF W2

OFF

on W2

ON

-PA- SP.VA/W2
W2Internal set point 2[ WRAN … 0.0 …  WRAN]

Input variable WEoFF WE18

OFFKH 6493 EN

SETP menu: Set point

on W2

External set point WE

F01 WE

Input for external feedback with three-step output

F02 WE

Input for feedforward control

3.2 -CO- SP.FU:
3.2.1

Set point functions-CO- SP.FU/RAMP Set point ramp

A set point ramp is especially suitable for controlled systems that work well with fast set pointchanges. Oscillations can be prevented by a ramped transition from one set point to a second set point. The set point at the SP.CO comparator in the set point ramp changes at a constant rate from the start set point to the target set point within the adjusted running time. The
setting of the -CO- SP.FU function is used to determine whether the ramp is to start with thecurrent value of the controlled variable X at the comparator, with the start value WIRA orwith another set point.
The TSRW parameter determines the running time of the set point ramp for the entire measuring range ( WINT to  WINT). When the set point changes from a value W to a newvalue W2, the actual running time of the set point ramp is the time t1 as shown in Fig. 4,
Fig. 5and Fig. 6.
The value for the TSRW parameter can be calculated as follows:
TSRW = t1 ·KH 6493 EN

 WINT –  WINTW2 – W

19

SETP menu: Set point− F01 RAMP setting – Start set point ramp with current value of the controlled variable
X at the comparator: this ramp function is started by the binary input. The set point at
the SP.CO comparator adopts the current value of the controlled variable X at the comparator when the binary input is activated. The ramp is started and the set point runs
until the target set point is reached (internal or external set point ) after the signal at thebinary input changes from active (1) to inactive (0). The ramp stops after the target set
point is reached. Afterwards the set point at the SP.CO comparator follows the target set
point (e.g. W) directly without any delay.
If the controller is switched to manual mode while the ramp is running, it is stopped andthe set point adopts the current value of the controlled variable X. The ramp continues to
run until the target set point is reached after the controller is switched back to the automatic mode. The set point at the SP.CO comparator returns to the current value of thecontrolled variable X at the comparator after the binary input is activated again while
the ramp is running (retriggering).
If the controller runs in automatic mode after the supply voltage is interrupted for morethan one second, the set point at the SP.CO comparator adopts the current value at thecomparator (with an active binary input) or the target set point (with an inactive binary
input).
SP.CO
X
WINT
W
SP.CO
X
WINT

t1
TSRW

t in sBI
1

Lower measuring

 WINT range value0t in sHand
Autot in sUpper measuring

 WINT range value
TSRW

Running time of set
point ramp

t1

Actual running timeof set point ramp

Fig. 4: Set point ramp start with BI, SP.CO = X

20

KH 6493 EN

SETP menu: Set point− F02 RAMP setting – Start set point ramp with start set point: this ramp function is started by the binary input. The set point at the SP.CO comparator is set to the predetermined start set point WIRA when the binary input is active.
The ramp is started and the set point runs until the target set point is reached (internal orexternal set point) after the signal at the binary input changes from active (1) to inactive(0). The ramp stops after the target set point is reached. Afterwards the set point at the
SP.CO comparator follows the target set point (e.g. W) directly without any delay.
If the controller is switched to manual mode while the ramp is running, it is stopped andthe set point at the SP.CO comparator adopts the current value of the controlled variable
X.
The ramp continues to run until the target set point is reached after the controller isswitched back to the automatic mode. The set point at the SP.CO comparator returns tothe current value at the X comparator after the binary input is activated again while theramp is running (retriggering).
If the controller runs in automatic mode after the supply voltage is interrupted for morethan one second, the set point at the SP.CO comparator adopts the start set point WIRA
(with an active binary input) or the target set point (with an inactive binary input).

KH 6493 EN

21

SETP menu: Set point

SP.CO
X
WINT
W

X

WIRA
WINT

SP.CO

t1
TSRW

t in sLower measuring

BI1

 WINT range value

Upper measuring

0t in sHand
Autot in s WINT range value
TSRW

Running time of set
point ramp

WIRA

Start value

t1

Actual running timeof set point ramp

Fig. 5: Set point ramp start with BI, SP.CO = WIRA

− F03 RAMP setting – Set point ramp constantly active, no starting condition:
the ramp function is constantly active. Every change of the set point causes the set pointat the SP.CO comparator to change according to the ramp function even when switching
between set points. The diagram shows the course of the set point ramp (SP.CO) after aswitchover of the set points W and W2 by the binary input (additional settings: -CO- SP.
VA = on W2 and -CO- SP.FU = F01 CH.SP). If the controller is switched to manualmode while the ramp is running, it is stopped and the set point at the SP.CO comparator
adopts the current value at the comparator X. The rump continues to run until the target
set point is reached after the controller is switched back to the automatic mode. If thecontroller runs in automatic mode after the supply voltage is interrupted for more than
one second, the set point at the SP.CO comparator adopts the target set point.

22

KH 6493 EN

SETP menu: Set point

SP.CO
X
WINT
W2

W
WINT

SP.CO

X

t1

t1

TSRW

TSRW

t in sBI
1

Lower measuring

 WINT range value0t in sHand
Autot in sUpper measuring

 WINT range value
TSRW

Running time of set
point ramp

t1

Actual running timeof set point ramp

Fig. 6: Constantly active set point ramp

3.2.2

-CO- SP.FU/CH.SP Set point switchover by binary input BI

This function is used to determine the conditions for switching between the internal and external set point.
− oFF CH.SP setting: No set point switchover− F01 CH.SP setting: Switchover between the active internal and external set point by thebinary input BI (W/W2 to WE)
WE is active when the binary input is active.
− F02 CH.SP setting: Switchover between the internal set points by the binary input BI (Wto W2)
W2 is active when the binary input is active.
W is active when the binary input is not active.
The -CO- SP.VA function must not be set to 'on WE'. If the set point W2 is activated at
the keys while the binary input is not active, it is not possible to switch to the set point W
with the binary input.

KH 6493 EN

23

SETP menu: Set point

Note
Several functions can be assigned to the binary input (see section 1).
SETP-CO- SP.FU

Set point ramp

oFF RAMP

OFF

F01 RAMP

Started with current value by binary input BI1

F02 RAMP

Started with WIRA by binary input BI1

F03 RAMP

Without start condition

PA- SP.FU/RAMP
TSRWRunning time

[1 … 10 … 9999 s]

WIRA

Start value[ WINT … 0.0 …  WINT]

Switchover W(W2)/WE by BI

24

oFF CH.SP

OFF

F01 CH.SP

W(W2)/WE by binary input BI1

F02 CH.SP

W/W2 by binary input BI1

KH 6493 EN

CNTR menu: Controller

4 CNTR menu: Controller
The control behavior is defined in this menu, especially the controller behavior with either the
P, PI, PD, PID or P²I action. Additionally, feedforward control and additional control functions
can be set in this menu.

4.1 -CO- C.PID:

Control algorithm

This function is used to configure the control algorithm and its control parameters. The controller is set by default to act with PI action.
− The proportional-action coefficient KP acts as gain on the P, I and D terms. Increasing
the proportional-action coefficient of a P controller causes the output amplitude to increase.
− The reset time TN is the parameter of the I term. The reset time TN is the time it takes forthe integral component during a step response in a PI controller to produce a change inthe output identical to the change produced by the P component.
Increasing the reset time TN causes a reduction in the rate of change in the output whenthe error is constant.
− The derivative-action time TV is the parameter of the D term. The derivative-action time
TV is the time it takes the rise response of a PD controller to reach a certain output earlier than it would with just its P term.
Increasing the derivative-action time TV causes an increase in output amplitude whenthe error rate of change is constant. After ramped error changes, a larger derivative-action time TV causes the D term to continue to have a longer effect.
− The derivative-action gain TVK1 is a gain factor on the D term.
− The operating point Y.PRE of the P or PD controller determines the output value, which is
fed to the controlled system when the process variable is the same as the set point.
− The dead band error DZXD is used to define the range of the error. Within this range,
the effective error is zero. The control signal is not changed. The dead band can be used
to suppress the response of the control loop. A valve is prevented from responding too
frequently to signal changes (oscillation).
− Error limitation
The  DZXD and  DZXD parameters limit the effective error for calculating the output
signal.
The  DZXD parameter is used to define the lower limit of the negative error and the 
DZXD parameter the upper limit of the positive error.

KH 6493 EN

25

WE

26

F.FOR

(+/–) ( WE – FC.K1 ) x FC.K2 + FC.K3≥0

Feedforward control

CNTR

+

AC.VA

AV.K1

BI

+
–

+

X

XD

SIGN

*–1

Process variable

X

W

Comparator

XD

X
DPID

C.PID

D

I

P

M.ADJ

CH.CA

Dead band Limiter

+

L1.XD

LIM1

Y.PRE

+

DIRE

Reversal of thedirection of action

L2.XD

LIM2

Limit monitor

ALRM

Xd %

CNTR menu: Controller

Fig. 7: CNTR menu

KH 6493 EN

CNTR menu: Controller

Assignment between control parameters and control behavior
P

PI

PD

PID

P²I

KP

•

•

•

•

•

TN

–

•

–

•

•

TV

–

–

•

•

–

TVK1

–

–

•

•

–

Y.PRE

•

•

•

•

•

DZXD

•

•

•

•

•

 DZXD

•

•

•

•

•

 DZXD

•

•

•

•

•

CNTR

-CO- C.PID

Control algorithm

P CP.YP

P behavior

PI CP.YP

PI behavior

Pd CP.YP

PD behavior

PId CP.YP

PID behavior

PPI CP.YP

P²I behavior-PA- C.PID
KP

Proportional-action coefficient[0.1 … 1.0 … 100.0]

TN

Reset time

[1 … 120 … 9999 s]

TV

Derivative-action time

[1 … 10 … 9999 s]

TVK1

Derivative-action gain

[0.10 … 1.00 … 10.00]

Y.PRE

Operating point[–10 … 0.0 … +110.0 %]DZXDDead band error Xd[0.0 … –110.0 %] DZXD

Minimum effective error Xd[–110.0 % …  DZXD] DZXD

Maximum effective error Xd[ DZXD … 110.0 %]Note
The control parameters KP, TN, TV and Y.PRE can also be set in the PAR menu.

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CNTR menu: Controller

4.2 -CO- SIGN:

Inversion error Xd

The error's direction of action can be inverted. The inversion converts an increasing error into a decreasing error or a decreasing error into an increasing error. This also inverts the direction of action of the output signal.
CNTR-CO- SIGN

Inversion error Xd

dir.d XD

Not inverted

in.d XD

Inverted

Note
The adjusted direction of action can also be changed with the -CO- DIRE function (see section 4.6).

4.3 -CO- D.PID:

Assignment of the D element (control output)

Either the error or controlled variable can be assigned as the source for the derivative component in PD and PID controllers.
− F01 DP.YP setting: The error Xd is the source for the D component. A change of the controlled variable and set point have an effect on the output over the D component.
− F02 DP.YP setting: The controlled variable X is the source for the D component. Achange of the controlled variable has an effect on the output over the D component. Achange of the set point is not included in the D component.
CNTR-CO- D.PID

Assignment D element control output

F01 DP.YP

To error

F02 DP.YP

To controlled variable

4.4 -CO- CH.CA:

Control mode selection P(D)/PI(D)Control mode changeover enables PI and PID controllers to be operated with or without integral action. This function allows the integral action to be activated automatically by the error
or set point. This function can only be selected when a PI or PID action has been configured(see section 4.1).
The control mode selection P(D)/PI(D) is preferably to be used when the valve is to move as
quickly as possible to the set point without overshooting while no steady-state error is to ex-

28

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CNTR menu: Controller

ist. This is required especially for control of discontinuous processes, such as during batch
operation of an autoclave, an open-steam vulcanizer or a hearth furnace.
When control mode changeover is selected, the P(PD) or PI(PID) action is active dependingon the error or set point. Outside a definable range of the error or set point, the controller
works with the P or PD control parameters. Within this range, the integral action is activated.
The parameters CLI.P and CLI.M are used to define this range. Fig. 8 clearly show this behavior.
Note
Special note for F01 CC.P setting: The operating point is determined by the last manual output value if the controller changes from manual to automatic mode while the error is outside
the defined range. The operating point applies until the error enters the defined range. In thisrange, the operating point is determined by the PI(D) behavior. The integral action is saved
and the last output value is set as the operating point when the error leaves the defined area
again. If the controller changes from automatic to manual mode, the operating point required for the plant must be reset again before returning to the automatic mode. The operating point is only saved temporarily (Y.PRE parameter does not have any effect). After a power failure, the operating point must be reset in manual mode.
CNTR-CO- CH.CA

Control mode selection P(D)/PI(D)oFF CC.P

OFF

F01 CC.P

By errorF02 CC.P

By set point-PA- CH.CA
CLI.P

Max. limit for PI(D) control[–110.0 … 10.0 … +110.0 %]

CLI.M

Min. limit for PI(D) control[–110.0 … –10.0 … +110.0 %]KH 6493 EN

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CNTR menu: Controller

W, XD
P(D)

CLI.P

PI(D)
CLI.M
P(D)
t

W

Set point

Xd

Error

CLI.P

Maximum limit for therange of PI(D) control

CLI.M

Minimum limit for therange of PI(D) control

Fig. 8: Control mode changeover

4.5 -CO- M.ADJ:
Operating point setting (manual mode) for YPID
This function is used to define an operating point in manual mode. In automatic mode, thedefined operating point is added to the calculated output variable.
The defined operating point remains active until either the operating point adjustment inmanual mode is deactivated by selecting oFF MA.YP or until a new operating point is adjusted in manual mode. If you deactivate operating point adjustment in manual mode, the output
variable defined in manual mode assumes the calculated value within approx. two seconds.
After a power failure, the operating point must be reset in manual mode.
CNTR

30

-CO- M.ADJ

Operating point setting (manual mode) for YPID

oFF MA.YP

OFF

on MA.YPON

KH 6493 EN

CNTR menu: Controller

4.6 -CO- DIRE:

Direction of action of the output variable

The DIRE function allows the direction of action of the output variable to be changed tomatch the direction of action of the control loop or control valve. The output variable may either act directly or inversely to the error (error = set point – process variable).
Note
The adjusted direction of action can also be changed with the -CO- SIGN function (see section 4.2).
CNTR-CO- DIRE

Direction of action of the output variable

dir.d DI.AC

Directin.d DI.AC

Inverted

4.7 -CO- F.FOR:

Feedforward control

The input variable WE can be used for feedforward control (see section 3.1).
The feedforward input signal can be multiplied and added by parameters according to theformula. The feedforward control signal is then connected to the controlled variable.
±(WE – FC.K1) · FC.K2 + FC.K3, with (WE – FC.K1) ≥ 0
FC.K1, FC.K2 and FC.K3 are constants that are defined in the parameter level. The mathematical sign of the formula is determined in the -CO- F.FOR function (see section 4.7).
The -CO- F.FOR function can be used for a measured value correction.
For example, if a Pt 100 sensor is connected in a two-wire circuit and the line resistancecauses a higher temperature reading, this reading error can be compensated for with a negative correction value.
Example: the temperature reading is too high by 2 °C (measuring range 0 to 100 °C). The
following setting is made to compensate for the reading error:− Function: -CO- F.FOR, POS FECO setting− Parameters -PA-: FC.K1 = 0.0 %, FC.K2 = 0.0, FC.K3 = –2.0 %KH 6493 EN

31

CNTR menu: Controller

Note
A measured value correction can also be performed with the function generation of the input
variable (-CO- FUNC, see section 2.8) or with the calibration of the input (-CO- ADJ, seesection 9.5).
a)

WE' in %WE' = +(WE – FC.K1) · FC.K2 + FC.K3

FC.K2

FC.K3
FC.K1

b)

WE in %

WE' in %WE' = –(WE – FC.K1) · FC.K2 + FC.K3

FC.K3

FC.K2
FC.K1

WE in %

-WE' in %WE

Input variable

WE'

Input variable (valuated)

FC.K1

Constant 1

FC.K2

Constant 2

FC.K3

Constant 3

Fig. 9: Feedforward control with positive (a) and negative (b) signs

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CNTR menu: Controller

CNTR

1)
2)

-CO- F.FOR

Feedforward control

oFF FECO

DeactivatedP0S FECO

With positive sign

nE6 FECO

With negative sign

FC.K1

Constant 1 for feedforward control[0.0 … 110.0 %] 1)

FC.K2

Constant 2 for feedforward control[0.0 … 1.0 … 100.0]

FC.K3

Constant 3 for feedforward control[–110.0 … 0.0 … 110.0 %] 1) 2)

Percent based on the measuring range of the controlled variable X.
The FC.K3 parameter can be adjusted within the range –9.99 to 99.99 with two decimal places.

4.8 -CO- AC.VA:

Increase/decrease process variableThis function is used to add the input signal X to the constant AV.K1 when the binary input isactivated. The new process variable is used for closed-loop control and is shown on the display (top row). The input signal X is used again for closed-loop control as soon as the binary
input is inactive again.
CNTR-CO- AC.VA

Increase/decrease process variableoFF IN.DE

Deactivatedbi1 IN.DE

By binary input BI

AV.K1

Constant in percent (± process variable)[–110.0 … 0.0 … 110.0 %]Note
Several functions can be assigned to the binary input (see section 1).

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OUT menu: Output

5 OUT menu: Output
The controller's output functions are set in this menu.

5.1 -CO- SAFE:

Activate constant output value

A predefined output value Y1K1 can be issued at the control output Y by the binary input inautomatic mode. The constant output value is activated when the binary input is active.
Closed-loop control continues starting from this output value after the binary input is inactive
again. The function can be used to enable control.
The constant output value cannot be activated in manual mode.
OUT-CO- SAFE

Activate constant output valueoFF SA.VA

OFF

bi1 SA.VA

By binary input BI1-PA- SAFE
Y1K1

Constant output value[–10.0 … 0.0 … 110.0 %]Note
Several functions can be assigned to the binary input (see section 1).

5.2 -CO- MA.AU: Manual/automatic switchover
This function is used to switch the controller to the manual modeand locks the
key aswell when the binary input is activated. The controller switches back to automatic mode when
the binary input is deactivated.
After the binary input is inactive again, the controller can be switched in manual mode backto automatic mode using the
key.
OUT

-CO- MA.AU

Manual/automatic switchoveroFF CH.MAOFF

bi1 CH.MA

By binary input BI

Note
Several functions can be assigned to the binary input (see section 1).

34

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KH 6493 EN

5)

4)

3)

2)

1)

MA.AU

Manual

YPID
X
XD
WE

Y.LIM

Limitation

C.OUT

1/– PPC

Y

5)

Y.SRC

FUNC[FU.YP]

Function
generation

OUT

Adaptation of the control output

OUT

ADAP

ADAP

Adaptation

TUNE

WE
Automatic
mode

BI

WE
Automatic
mode

BI

B.OUT[B.B02]

Configuration B02

B.OUT[B.B01]

Configuration B01

CALC(+/–) ( Y – CA.K1 ) x CA.K2 + CA.K3
≥0

BLOC

Blocking

OUT

RAMP

Ramp

Output Y

YPID

4)

I–O

Assignment to two-step or three-step output
Assignment to the binary output BO1, BO2
Assignment to the limit relay L1, L2
y reading in the operating level in manual modey reading in the operating level in automatic mode

2P
3P int. RF
3P ext. RF

Two-step/three-step output

SAFE

Constant
output value

OUT

LIM2

LIM1

YOUT

I–O

3)

2)

1)

3)

2)

1)

OUT

LIM2
[L2.YP]

LIM2

Y.VA

0-20 mA
4-20 mA

Control signal
range

LIM1
[L1.YP]

LIM1

ALRM

L2

L1

Y

OUT menu: Output

Fig. 20: OUT menu

35

OUT menu: Output

5.3 -CO- Y.LIM:

Control signal limitation YPID

Control signal limitation is always active. This functions allows you to determine the parameters for the minimum and maximum output variable.
0 % represents 4 mA and 100 % represents 20 mA for a 4 to 20 mA control signal.
OUT-CO- Y.LIM

Control signal limitation YPID

on LI.YP

ON-PA- Y.LIM
YMinimum output variable[–10.0 … 0.0 … 110.0 %]YMinimum output variable[–10.0 … 100.0 … 110.0 %]5.4 -CO- RAMP:

Output ramp/output rate limitation YPID

Settings F01 RA.YP und F02 RA.YP –Output ramp
The output ramp is the change of the output variable at a constant rate. The TSRA parameter
determines the running time of the output ramp and the rate as a result.
It is based on a change of the output variable by 100 % (Fig. 10). The control output is set tothe start value when the binary input is activated. The deactivation of the binary input causes
the output ramp to start.
− The F01 RA.YP setting sets the start value to –10.0 %.
− The F02 RA.YP setting allows the start value to be set as required using the Y1RA parameter.
Manual mode and restart after supply voltage failure cause the output ramp to be deactivated.
Settings F03 RA.YP, F04 RA.YP and F05 RA.YP –Limitation of rate of change of the output variable
The rate of change of the output variable can be restricted when the output variable rises
and/or falls. The output variable changes in the restricted direction(s) only as fast at the rate
fixed by the TSRA parameter. The TSRA running time is based on a change of the output
variable by 100 %. A limitation does not apply when the actual rate of change of the output
variable is lower than the defined rate of change.

36

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OUT menu: Output

Fig. 11 shows how the described function works. The rate of change of the output variable vy
is calculated as follows: ≥
vy =

100 %
TSRA

Ramp (increasing)
Start value Y1RA = 0 %
YOUT
YPID
100

Ramp (increasing)
0 % < Start value Y1RA < 100 %
YOUT
YPID

%

%

100
YPID

YPID

YOUT

YOUT
Y1RA = 0

TSRA

t in s

BI
1

Y1RA
0

TSRA

t in sBI100t in st in sRamp (decreasing)
Start value Y1RA = 100 %
YOUT
YPID
Y1RA = 100

%

YOUT
YPID

0

TSRA

t in sBI
10BI

Binary input

TSRA

Running time

YOUT

Analog output

YPID

Internal output variable

Y1RA

Start value

t in sFig. 10: Output ramp: setting F02 RA.YP Ramp increasing/decreasing, start with Y1RA by BI

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37

OUT menu: Output

OUT-CO- RAMP

Output ramp/limitation of rate of change for output variable

oFF RA.YP

OFF

F01 RA.YP

Ramp increasing, start with –10 % by BI1

F02 RA.YP

Ramp increasing/decreasing, start with Y1RA by BI1

F03 RA.YP

Limitation when output variable decreases and increases

F04 RA.YP

Limitation when output variable increases

F05 RA.YP

Limitation when output variable decreases-PA- RAMP/RA.YP
TSRA

Running time

[1 … 9999 s]

Y1RAStart value[–10.0 … 0.0 … 110.0 %]Note
Several functions can be assigned to the binary input (see section 1).

5.5 -CO- BLOC:

Blocking output variable YPID

This functions blocks the control signal when the binary input BI is activated. The current output value remains active at the control output while the binary input is active. As soon as thebinary input is deactivated, the blocking stops and the control loop continues using the last
output value.
OUT-CO- BLOC

Blocking output variable YPIDoFF BL.YPOFF

on BL.YP

By binary input BI1

Note
Several functions can be assigned to the binary input (see section 1).

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OUT menu: Output

YOUT
YPID

F03 RA.YP setting
Limitation when output
variable decreases and increases

%

100

YPID
YOUT

0

YOUT
YPID

F04 RA.YP setting
Limitation when output
variable increases

TSRA

TSRA

t in s

%

100

YPID
YOUT

0

YOUT
YPID

F05 RA.YP setting
Limitation when output
variable decreases

TSRA

t in s

%

100

YOUT

0

YPID

TSRA

t in sTSRA

Running time

YOUT

Analog output

YPID

Internal output variable

Fig. 11: Limitation of rate of change for output variable

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39

OUT menu: Output

5.6 -CO- FUNC:

Function generation of the output variable

Similar to the input variables X and WE, function generation can also be performed for the
output variable Y. Read section 2.8 for a detailed description of the function generation. The
input and output values are specified in percent.
OUT-CO- FUNC

Function generation of the output variable

oFF FU.YPOFF

on FU.YP

ON-PA- FUNC/FU.YP
K1.X

Input value 1[–10.0 … 0.0 … 110.0 %]K1.Y

Output value 1[–10.0 … 0.0 … 110.0 %]

…

…

…

K7.X

Input value 7[–10.0 … 0.0 … 110.0 %]K7.Y

Output value 7[–10.0 … 0.0 … 110.0 %]5.7 -CO- Y.VA:

Signal range for analog output Y

This function is used to set the signal range of the analog output.
OUT

40-CO- Y.VA

Signal range for analog output Y

oFF Y

OFF

0–20 mA

0 to 20 mA

4–20 mA

4 to 20 mA

0–10 V

0 to 10 V

2–10 V

2 to 10 V

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OUT menu: Output

5.8 -CO- Y.SRC:

Source for analog output Y

This function is used to determine the source for the analog output Y. The output variable YPID is assigned to the analog output by default. Optionally, the input variables X, WE or theerror Xd can be assigned as the source.
The input variables X and WE are issued based on the input measuring range (e.g. for an input measuring range 0 to 200 °C):
X = 0 °C  Y = 0 % (e.g. 4 mA) and X = 200 °C  Y = 100 % (e.g. 20 mA)
The error is issued based on the range –100 to +100 %, i.e.:
Xd = –100 %  Y = 0 % (e.g. 4 mA) and X = +100 %  Y = 100 % (e.g. 20 mA)
OUT-CO- Y.SRC

Source for analog output Y

on Y.PID

Output YPID

on Y.X

Input X

on Y.WE

Input WE

on Y.XD

Error Xd

5.9 -CO- CALC:

Mathematical adaptation analog output Y

This function is used for the mathematical adaptation of a continuous-action output. The following formulas are used:
YOUT = ±(Y – CA.K1) · CA.K2 + CA.K3
OUT-CO- CALC

Mathematical adaptation analog output Y

oFF CA.Y

OFF (no output signal)

on CA.Y

Without condition

PO5 CA.Y

With positive sign

nE6 CA.Y

With negative sign

-PA- CALC/CA.Y
CA.K1

Constant 1[0.0 … 100.0 %]CA.K2

Constant 2[0.0 … 1.0 … 10.0]

CA.K3

Constant 3[–10.0 … 0.0 … 110.0 %]KH 6493 EN

41

OUT menu: Output

5.10 -CO- C.OUT:

Two-step or three-step output

This function is used to set the two-step or three-step output.
− Setting on 2.STP – Two-step output as limit monitoring of the output variable
The two-step output Y+ acts on the relay BO1. It can assume the ON or OFF states. For
example, it can be used to control electric heating (oven). This version of the two-step
output corresponds to monitoring for a violation above the limit TZ by the output variable YPID. The activation point is determined by the limit TZ and the deactivation pointby the switching differential XSDY. The
icon appears on the display as soon as therelay BO1 is activated.
In manual mode, the two-step output is deactivated and the
key can be used to activate the relay BO1.
Electrical connection u EB 6493.
XSDY

Y+
1
YPID

Y+
0
TZ YPID

Fig. 12: Two-step output

Note− Other versions of the two-step output can be configured:(1) Two-step output with pulse width modulation (PWM), see page 47.
(2) Two-step output as limit monitoring of the error Xd or controlled variable X with the L1
and L2 limit relays (see page 55)− If the relay BO1 is used with the 'on 2.STP' setting as a two-step output, the relay BO2 isavailable for the output of limit alarms or status alarms.

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OUT menu: Output

OUT-CO- C.OUT

Two-step or three-step output

on 2.STP

Two-step output-PA- C.OUT/2.STP
XSDY

Switching differential[0.10 … 0.50 % … TZ]

TZ

Dead band[XSDY … 2.00 … 100.0 %]− i.Fb 3.STP setting: Three-step output with internal feedback
The three-step output is used to control an electric actuator or other equipment with integrated behavior over two relays.
The relay BO1 moves the actuator in the + direction (e.g. actuator stem retracts or thevalve opens) and the relay BO2 in the – direction (e.g. actuator stem extends or thevalve closes). The actuator stops when both relays are switched off.
For the three-step output with internal feedback, the position of the actuator is calculated
from the entered transit time TY (transit time of the actuator) and the internally fed backcontrol pulses. In this case, it is important to note that the actual position of the actuator
may deviate from the calculated position.
The three-step output has two pairs of switching points Y+ and Y– each with an activation and deactivation point.
The switching differential XSDY is used to set the distance between the activation anddeactivation points. A lower XSDY setting causes the control pulses to become shorterand the switching frequency to increase. Note that the switching differential must always
be lower than TZ/2.
The dead band TZ is used to set the distance between the activation points of control
pulses Y+ and Y–. The switchover between Y+ and Y– takes longer, the higher the TZ isset.
The comparator calculates the difference from the output variable YPID (target position)and the feedback signal Y’ (calculated actual position). Depending on the difference
YPID – Y’, the control pulses are generated as follows:– The + output BO1 is switched on when the difference between the target and actual
position is greater than TZ/2.
– The — output BO2 is switched on when the difference between the target and actual
position is –TZ/2.
– The BO1 and BO2 are switched off when the difference between the target andactual position is smaller than (TZ/2 – XSDY) and greater than (–TZ/2 + XSDY).

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43

OUT menu: Output

TZ
Y+
1)

W

+

X

–

Y+

41
BO1

L

42
43

XSDY

YPID +

PID

XSDY

Y'

YPID – Y'

–

2)

Y–
Y–

51
BO2

52
53
N

M

Y'

%

100
0
1)

Reading of the output variable– in the operating level as Y in automatic mode
– in the I-O/ANA menu as YPID

t
TY s
2)

Reading of the internal position feedback in theoperating level as Y in manual mode

Fig. 13: Three-step output with internal feedback− The control pulse Y+ switches the relay BO1 on permanently if the output variable YPID isequal or greater than 100 %.
− The control pulse Y– switches the relay on permanently if the output variable YPID isequal or smaller than 0 %.
In manual mode, the relays are not activated over the three-step output.
In manual mode, thekey is used to control the relay BO1 (Y+) and thethe relay BO2 (Y–).

key to control

Note
Note on the control signal limitation -CO- Y.LIM: The Y parameter must not be set to begreater than 0.0 % and the Y parameter not lower than 100.0 % to ensure the three-step
output can move the actuator to the end position on demand with the constant signals Y+
and Y– (see section 5.3).

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OUT menu: Output

OUT-CO- C.OUT

Two-step or three-step output

i.Fb 3.STP

Three-step output with internal feedback-PA- C.OUT/3.STP
XSDY

Switching differential[0.10 … 0.50 % … TZ]

TZ

Dead band[XSDY … 2.00 … 100.0 %]TYTransit time

[1 … 60 … 9999 s]− E.Fb 3.STP setting: Three-step output with external feedback
The three-step output is used to control an electric actuator or other equipment with integrated behavior over two relays.
The relay BO1 moves the actuator in the + direction (e.g. actuator stem retracts or thevalve opens) and the relay BO2 in the – direction (e.g. actuator stem extends or thevalve closes). The actuator stops when both relays are switched off.
For the three-step output with external feedback, the position of the actuator is fed backover the input variable WE by a potentiometer, for example.
The switching differential XSDY is used to set the distance between the activation anddeactivation points. A lower XSDY setting causes the control pulses to become shorterand the switching frequency to increase. Note that the switching differential must always
be lower than TZ/2.
The dead band TZ is used to set the distance between the activation points of control
pulses Y+ and Y–. The switchover between Y+ and Y– takes longer, the higher the TZ isset.
The comparator calculates the difference YPID – WE from the output variable YPID (target position) and the feedback signal WE (actual position). Depending on the difference, the control pulses are generated as follows:– A difference greater than TZ/2 causes the control pulse Y+ to switch on relay BO1.
– A difference smaller than TZ/2 causes the control pulse Y– to switch on relay BO2.
– A difference smaller than the amount TZ/2 – XSDY causes both relays to be
switched off.
In manual mode, the relays are not activated over the three-step output.
In manual mode, thekey is used to control the relay BO1 (Y+) and the
key tocontrol the relay BO2 (Y–).
The input variable WE must be configured for position feedback.

KH 6493 EN

45

OUT menu: Output

Example: position feedback with a potentiometer over input IN2– Set input signal for analog input IN2:
IN menu, -CO- IN2 function, 0–1 kOHM setting (see section 2.2)
– Assign input variable WE to the analog input IN2:
IN menu, -CO- CLAS function, In2 WE setting (see section 2.5)
– Assign input variable WE to the external position feedback:
SETP menu, -CO- SP.VA function, F01 WE setting (see section 3.1)
TZ
Y+
1)

W

+

X

–

41
BO1

L

42
43

XSDY

YPID +

PID

XSDY

Y+

WE

YPID – WE

–

2)

Y–
Y–

51
BO2

52
53
N

M
100 %
IN1/IN2
0%

1)

Reading of the output variable– in the operating level as Y in automatic mode
– in the I-O/ANA menu as YPID

2)

Reading of the external position feedback– in the operating level as Y in manual mode
– in the I-O/ANA menu as FE.CO

Fig. 14: Three-step output with external feedback

Note
The target position of the actuator can be restricted in -CO- Y.LIM with the Y and Y parameters (travel limit).

46

KH 6493 EN

OUT menu: Output

OUT-CO- C.OUT

Two-step or three-step output

E.Fb 3.STP

Three-step output with external feedback-PA- C.OUT/3.STP
XSDY

Switching differential[0.10 … 0.50 % … TZ]

TZ

Dead band[XSDY … 2.00 … 100.0 %]− Setting PP 2.STP – on/off output with pulse width modulation (PWM)
The on/off output with pulse width modulation (PWM) converts the continuous YPID signal into a pulse sequence with a pulse width modulation that varies depending on the
YPID value (Fig. 15). The two-step output can be used to control electric heating (oven).
The duty cycle TE of the two-step signal Y+ is calculated as follows:TE =(Y in % – TZ in %) · KPL1
100 %· TYL1 in s

The TYL1 parameter is the cycle duration and at the same time the maximum duty cycle.
KPL1 is a gain factor.
The  TYL1 parameter indicates the minimum duty cycle of the two-step signal Y+.
It is at least 0.3 seconds (due to the hardware).
By selecting the appropriate TYL1, KPL1 and  TYL1 parameters, it is possible toachieve a compromise between a low fluctuation range of the controlled variable (highswitching frequency) and a long service life of the control valve (low switching frequency) at the two-step output with PWM. The two-step output acts directly on the relay BO1
and in reverse on the relay BO2.
In manual mode, the two-step output is controlled over the manual output value and thepulse of the relay according to the adjusted pulse width ratio.

1)

W
X

+
–

PID

YPID +

Y+

TE
TYL1
KPL1
TZ

TYL1

TE
Y+

YPID
%

41
BO1

t
TYL1

TYL1
1)

42
43

s

Reading of the output variable– in the operating level as Y
– in the I-O/ANA menu as YPID

Fig. 15: Two-step output with PWM

KH 6493 EN

47

OUT menu: Output

Note− Another version of the two-step output can be set:
(1) Two-step output as limit monitoring of the error Xd or controlled variable X with the L1
and L2 limit relays (see section 6)(2) Two-step output as limit monitoring of the output variable Y (see section 5.10 for 'on
2.STP' setting).
− The relay BO1 cannot be used for limit monitoring when the two-step output is configured.
The relay no longer acts as a two-step output with PWM if limit monitoring (-CO- LIM2) is
configured for relay BO2.
− The minimum duty cycle is (also) set in -CO- Y.LIM with the Y parameter in percent in relation to the cycle duration.
− The maximum duty cycle is set in -CO- Y.LIM with the Y parameter in percent in relation
to the cycle duration.
OUT-CO- C.OUT

Two-step or three-step output

PP 2.STP

Two-step output with PWM-PA- C.OUT/2.STP
KPL1

48

Gain Y+ (BO1)[0.1 … 1.0 … 100.0]

TYL1

Cycle duration Y+ (BO1)[1.0 … 10.0 … 9999 s]

 TYL1

Min. duty cycle Y+ (BO1)[0.1 … 1.0 s … TYL1]

TZ

Dead band[0.10 … 2.00 … 100.0 %]KH 6493 EN

OUT menu: Output− i.PP 3.STP setting: Three-step output with internal feedback and PWM
For the three-step output with internal feedback and pulse width modulation, the control
pulses are issued with pulse width modulation.
The position of the actuator is calculated from the entered transit time TY (transit time of
the actuator) and the internally fed back control pulses. In this case, it is important tonote that the actual position of the actuator may deviate from the calculated position.
A characteristic can be adjusted for the control pulses Y+ and Y–.
– The distance between both characteristic zero points is set by setting the dead band
TZ. The switchover between Y+ and Y– takes longer, the higher you set TZ.
– The KPL1 parameter is used to adjust the gain of the characteristic for the signal Y+.
– The KPL2 parameter is used to adjust the gain of the characteristic for the signal Y–.
– The TYL1 parameter is used to adjust the cycle duration of the characteristic for thesignal Y+.
– The TYL2 parameter is used to adjust the cycle duration of the characteristic for thesignal Y–.
– The TYL1 parameter is used to adjust the minimum duty cycle for the signal Y+.
– The TYL2 parameter is used to adjust the minimum duty cycle for the signal Y–.
The minimum duty cycle is at least 0.3 seconds (due to the hardware).
The three-step output can be adapted to various transit times (e.g. the extending and retracting the actuator) with gain factors and cycle durations.
The comparator calculates the difference from the output variable YPID (target position)and the feedback signal Y’ (calculated actual position). Depending on the difference YPID – Y’, the control pulses are generated as follows:– The control pulses Y+ become longer as the positive difference increases.
– The control pulses Y– become longer as the negative difference increases.
– A control pulse is not issued if the difference is within the range of ±TZ/2.
– A control pulse Y+ is not issued if the positive difference is smaller than TZ/2 +TYL1.
– A control pulse Y– is not issued if the negative difference is smaller than TZ/2 +TYL2.
– The control pulse Y– switches the relay BO2 on permanently if the output variable
YPID is equal or smaller than 0 %.
– The control pulse Y+ switches the relay BO1 on permanently if the output variable
YPID is equal or greater than 100 %.
In manual mode, the relays are not activated over the three-step output.
In manual mode, thekey is used to control the relay BO1 (Y+) and thecontrol the relay BO2 (Y–).

KH 6493 EN

key to

49

1)

X

50

PID
2)

1)

Y'

YPID +– KPL2TE
TYL2YPID – Y'

KPL1

Reading of the output variable– in the operating level as Y in automatic mode
– in the I-O/ANA menu as YPID

–

+

W

TE
TYL1
TZ

2)

TY

s

t

TYL2

TYL2

%

TE

TYL1

TE

TYL2

TYL1

TYL1

s

t

s

t

Y–

Y+

BO2

BO1

Reading of the internal position feedback in theoperating level as Y in manual mode

0

100

Y'

Y–

Y+

53

52

51

43

42

41

M

L

N

OUT menu: Output

Fig. 16: Three-step output with internal feedback and PWM

KH 6493 EN

OUT menu: Output

OUT-CO- C.OUT

Two-step or three-step output

i.PP 3.STP

Three-step output with internal feedback and PWM-PA- C.OUT/2.STP
KPL1Gain Y+ (BO1)[0.1 … 1.0 … 100.0]

KPL2

Gain Y– (BO2)[0.1 … 1.0 … 100.0]

TYL1

Cycle duration Y+ (BO1)[1.0 … 10.0 … 9999 s]

TYL2

Cycle duration Y– (BO2)[1.0 … 10.0 … 9999 s]

 TYL1

Min. duty cycle Y+ (BO1)[0.1 … 1.0 s … TYL1]

 TYL2

Min. duty cycle Y– (BO2)[0.1 … 1.0 s … TYL2]

TZ

Dead band[0.10 … 2.00 … 100.0 %]TYTransit time

[1 … 60 … 9999 s]− E.PP 3.STP setting: Three-step output with external feedback and PWM
For the three-step output with external feedback and pulse width modulation, the control
pulses are issued with pulse width modulation.
The position of the actuator is fed back over the input variable WE by a potentiometer,
for example.
A characteristic can be adjusted for the control pulses Y+ and Y–.
– The distance between both characteristic zero points is set with the dead band TZ.
The switchover between Y+ and Y– takes longer, the higher the TZ is set.
– The KPL1 parameter is used to adjust the gain of the characteristics for the signal
Y+.
– The KPL2 parameter is used to adjust the gain of the characteristics for the signal Y–.
– The TYL1 parameter is used to adjust the cycle duration of the characteristic for thesignal Y+.
– The TYL2 parameter is used to adjust the cycle duration of the characteristic for thesignal Y–.
– The TYL1 parameter is used to adjust the minimum duty cycle for the signal Y+.
– The TYL2 parameter is used to adjust the minimum duty cycle for the signal Y–.

KH 6493 EN

51

OUT menu: Output

The minimum duty cycle is at least 0.3 seconds (due to the hardware).
The comparator calculates the difference YPID – WE from the output variable YPID (target position) and the input variable WE (actual position). Depending on the difference,the control pulses are generated as follows:– The control pulses Y+ become longer as the positive difference increases.
– The control pulses Y– become longer as the negative difference increases.
– A control pulse is not issued if the difference is within the range of ±TZ/2.
– A control pulse Y+ is not issued if the positive difference is smaller than TZ/2 +TYL1.
– A control pulse Y– is not issued if the negative difference is smaller than TZ/2 +TYL2.
The input variable WE must be configured for position feedback.
Example: position feedback with a potentiometer over input IN2– Set input signal for analog input IN2:
IN menu, -CO- IN2 function, 0–1 kOHM setting (see section 2.2)
– Assign input variable WE to the analog input IN2:
IN menu, -CO- CLAS function, In2 WE setting (see section 2.5)
– Assign input variable WE to the external position feedback:
SETP menu, -CO- SP.VA function, F01 WE setting (see section 3.1)
In manual mode, the relays are activated over the three-step output. The manual output
value Y is used to determine the target position for the three-step output.
Note
The target position of the actuator can be restricted in -CO- Y.LIM with the Y and Y parameters (travel limit).

52

KH 6493 EN

KH 6493 EN

1)

–

PID

2)

WE – KPL2

YPID +

1)

TE
TYL2

Reading of the output variable– in the operating level as Y in automatic andmanual mode
– in the I-O/ANA menu as YPID

X

+

W

TE
TYL1
TZ

2)

Y–
TE

TYL2

TYL2

TYL1

TE

TYL2

TYL1

TYL1

IN1/IN2

s

t

s

t

Y–

Y+

53

52

51

43

42

41

0%

100 %

BO2

BO1

Reading of the external position feedback in I-O/ANA menu
as FE.CO

YPID–WE

KPL1

Y+

M

N

L

OUT menu: Output

Fig. 17: Three-step output with external feedback and PWM

53

OUT menu: Output

OUT-CO- C.OUT

Two-step or three-step output

E.PP 3.STP

Three-step output with external feedback and PWM-PA- C.OUT/3.STP
KPL1Gain Y+ (BO1)[0.1 … 1.0 … 100.0]

KPL2

Gain Y– (BO2)[0.1 … 1.0 … 100.0]

TYL1

Cycle duration Y+ (BO1)[1.0 … 10.0 … 9999 s]

TYL2

Cycle duration Y– (BO2)[1.0 … 10.0 … 9999 s]

 TYL1

Min. duty cycle Y+ (BO1)[0.1 … 1.0 s … TYL1]

 TYL2

Min. duty cycle Y– (BO2)[0.1 … 1.0 s … TYL2]

TZ

Dead band[0.10 … 2.00 … 100.0 %]5.11 -CO- B.OUT:
Binary outputs BO1 and BO2 for status indication
This function is used to set the binary outputs BO1 and BO2 to indicate operating states. The
status of the binary outputs can be read in the I–O menu (BIN) (see section 9.4).
Note
The functions of two-step or three-step output -CO- C.OUT have priority over the functions of
the binary outputs B.OUT (see section 5.10). Only the function of BO2 can be used if the
C.OUT function is set to 'on 2.STP' or 'PP 2.STP' (see section 5.10). All settings of B.OUT
have priority over the setting of the LIM1 and LIM2 functions (see section 6.1 and section 6.2).
OUT

54-CO- B.OUT
oFF B.BO1
F01 B.BO1
F02 B.BO1
F03 B.BO1

Binary output BO1
OFFActive when binary input is set
Active when WE is active
Active in automatic modeoFF B.BO2

Binary output BO2OFF

F01 B.BO2

Active when binary input is set

F02 B.BO2
F03 B.BO2

Active when WE is active
Active in automatic mode

KH 6493 EN

ALRM menu: Limit relays

6 ALRM menu: Limit relays
The functions of the limit relays L1 and L2 are set in this menu.
The limit relays monitor a variable for a violation above or below limits. The -CO- LIM1 and-CO- LIM2 functions are used to enter the variable to be monitored and the condition (violation above or below the limit) to switch the limit relay L2.
The limit is defined in the parameter level with LI.X, LI.WE, LI.YPID or LI.XD. A switching differential (hysteresis) must also be defined with the L.HYS A parameter. This switching differential is the distance between the switching points to activate and deactivate the limit relay
and is specified in percent based on the measuring range.
Fig. 18 and Fig. 19 show an example of monitoring of the controlled variable X with the parameters that need to be set to illustrate the function of the limit relay. The example shows: if
a variable is monitored for a violation of a maximum limit, the limit relay is activated whenthe variable exceeds the adjusted limit LI.X, LI.WE, LI.YPID or LI.XD. In the reverse direction,
the limit relay is deactivated when the variable falls below the limit minus the switching differential L.HYS. If a variable is monitored for a violation of a minimum limit, the limit relay isactivated when the variable falls below the adjusted limit LI.X, LI.WE, LI.YPID or LI.XD. In thereverse direction, the limit relay is deactivated when the variable exceeds the limit plus theswitching differential L.HYS.
The
icon for limit relay 1 andlay is active.

for limit relay 2 appear on the display when the limit re-Controlled variable X lower than the limit

L.HYS-CO- LIM1: Lo L1.X
-PA- LI.X = 10.0 °C-PA- L.HYS = 0.5 %X
LI.X

Controlled variable X greater than the limit

L.HYS-CO- LIM1: Hi L1.X
-PA- LI.X = 90.0 °C-PA- L.HYS = 0.5 %X
LI.X

Fig. 18: Functioning of the limit relay L1 and L2 (example shows L1) – Part 1

KH 6493 EN

55

ALRM menu: Limit relays

Error Xd greater than the limit

L.HYS-CO- LIM1: Hi L1.XD-PA- LI.XD = 1.5 %-PA- L.HYS = 0.5 %
X
LI.XD

W

Error Xd greater than the limit
Application: Two-step controller for heating

L.HYS

X

-CO- LIM1: Hi L1.XD-PA- LI.XD = 0.5 %-PA- L.HYS = 1.0 %

LI.XD
W

Error Xd smaller than the limit

L.HYS-CO- LIM1: Lo L1.XD-PA- LI.XD = –1.5 %-PA- L.HYS = 0.5 %
X
W

LI.XD

Error Xd smaller than the limit
Application: Two-step controller for cooling

L.HYS

X

-CO- LIM1: Lo L1.XD-PA- LI.XD = –0.5 %-PA- L.HYS = 1.0 %

LI.XD
W

Absolute value of error Xd greater than the
limit

L.HYS

L.HYS

X
LI.XD

W

-CO- LIM1: AbS L1.XD-PA- LI.XD = 1.5 %-PA- L.HYS = 0.5 %LI.XD

Fig. 19: Functioning of the limit relay L1 and L2 (example shows L1) – Part 256

KH 6493 EN

ALRM menu: Limit relays

6.1 -CO- LIM1:

Limit relay L1This function is used to enter the variable to be monitored and the condition (violation above
or below the limit) to switch the limit relay L1. A detailed description of how the limit monitoring functions can be found on page 55.
Note
The functions of two-step or three-step output -CO- C.OUT (see section 5.10) and functions
for the binary outputs -CO- B.OUT (see section 5.11) have priority over the settings in functions -CO- LIM1 and -CO- LIM2.
ALRM-CO- LIM1

Limit relay 1

oFF L1

OFF

Lo L1.X

When X is not reached

Hi L1.X

When X is exceeded

Lo L1.WE

When WE is not reached

Hi L1.WE

When WE is exceeded

Lo L1.YP

When YPID is not reached

Hi L1.YP

When YPID is exceeded

Lo L1.XD

When Xd is not reached

Hi L1.XD

When Xd is exceeded

AbS L1.XD

When absolute value of Xd isexceeded-PA- LIM1/L1
LI.X

Limit for X[ IN1 … 100.0 …  IN1]
[ IN2 … 100.0 …  IN2]

LI.WE

Limit for WE[ IN1 … 100.0 …  IN1]
[ IN2 … 100.0 …  IN2]

LI.YP

Limit for YPID[ Y … 100.0 % …  Y]

LI.XD

Limit for Xd[–110.0 … 0.0 … 110.0 %]LI.HYS

Switching differential[0.10 … 0.50 … 100.0 %]KH 6493 EN

57

ALRM menu: Limit relays

6.2 -CO- LIM2:

Limit relay L2This function is used to enter the variable to be monitored and the condition (violation above
or below the limit) to switch the limit relay L2. A detailed description of how the limit monitoring functions can be found on page 55.
Note
The functions of two-step or three-step output -CO- C.OUT (see section 5.10) and functions
for the binary outputs -CO- B.OUT (see section 5.11) have priority over the settings in functions -CO- LIM1 and -CO- LIM2.
ALRM-CO- LIM2

Limit relay 2oFF L2

OFF

Lo L2.X

When X is not reached

Hi L2.X

When X is exceeded

Lo L2.WE

When WE is not reached

Hi L2.WE

When WE is exceeded

Lo L2.YP

When YPID is not reached

Hi L2.YP

When YPID is exceeded

Lo L2.XD

When Xd is not reached

Hi L2.XD

When Xd is exceeded

AbS L2.XD

When absolute value of Xd isexceeded-PA- LIM2/L2

58

LI.X

Limit for X[ IN1 … 100.0 …  IN1]
[ IN2 … 100.0 …  IN2]

LI.WE

Limit for WE[ IN1 … 100.0 …  IN1]
[ IN2 … 100.0 …  IN2]

LI.YP

Limit for YPID[ Y … 100.0 % …  Y]

LI.XD

Limit for Xd[–110.0 … 0.0 … 110.0 %]LI.HYS

Switching differential[0.10 … 0.50 … 100.0 %]KH 6493 EN

AUX menu: Additional functions

7 AUX menu: Additional functions
7.1 -CO- RE.CO:

Restart conditions after power failureThis function is used to define which controller output value and operating mode is to be used
after a restart due to power failure.
− F01 MODE setting: Manual mode with constant output value Y1K1
− F02 MODE setting: Automatic mode, start with output value Y1K1 and the current set
point
AUX

-CO- RE.CO

Restart conditions after power failure

F01 MODE

Manual mode with constant output value Y1K1

F02 MODE

Auto, start with constant output value
Y1K1-PA- RE.CO/MODE
Y1K1

7.2 -CO- ST.IN:

Constant output value[–10.0 … 0.0 … 110.0 %]Reset to default settings

Î See u EB 6493.
This function causes all parameters, functions and calibration data to be reset. After the reset,"FrEE INIT" appears on the display.
AUX-CO- ST.IN

Reset to default settings

FrEE INITOFFAII INITAll functions, parameters and code number

FUnC INIT

All functions

PArA INIT

All parameters and code number

AdJ INIT

Calibration values for IN1, IN2, Y

KH 6493 EN

59

AUX menu: Additional functions

7.3 -CO- KEYL:

Lock control keys

The keys can be locked:− bi1 LOCK setting: Locks all keys over the binary input BI− on noH.W setting: the , ,andkeys are locked. The controller remains in theoperating mode that it was in before the keys were locked.
AUX-CO- KEYL

Lock control keys

oFF LOCKOFF

bi1 LOCK

Activate/deactivate over the binary input BI1

on noH.W

Selector, manual/automatic and cursor keys OFF

Note
Several functions can be assigned to the binary input (see section 1).

7.4 -CO- VIEW:

Top/bottom viewing angle of display

The contrast for the top and bottom viewing angle of the display can be changed from Level
1 to Level 10.
The default setting (Level 6) only needs to be changed in extreme installation situations.
AUX

60-CO- VIEW

Top/bottom viewing angle of display

01 VIEW

Level 1…

…

06 VIEW

Level 6…

…

10 VIEW

Level 10

KH 6493 EN

AUX menu: Additional functions

7.5 -CO- FREQ:

Power line frequency (ripple filter)

This function is used to filter out the supply voltage hum of 50 Hz or 60 Hz superimposed on
the analog input signals. For this purpose, the power line frequency of a low-voltage system
must be set at the controller. The power line frequency must be set even when the controller isoperated with DC voltage.
AUX-CO- FREQ

Power line frequency

on 50Hz50 Hz

on 60Hz

60 Hz

7.6 -CO- DP:

Decimal separator settingThis function is used to set the number of decimal places for the controlled variable and set
point readings.
Additionally, the decimal places for parameters directly related to the analog inputs can bechanged with this function. These parameters include:− Measuring ranges of the analog inputs− Function generation of input variables X and WE− Limits LI.X and LI.WE for limit monitoring of input variables X and WE
The number of decimal places is automatically reduced if the measured value (parameter value) is so high that it cannot be displayed with the decimal separator settings. The number ofdecimal places increase again to the configured decimal separator setting when the measured value (parameter value) falls.
AUX-CO- DP

Decimal separator settingon DP1

No digiton DP2

One digit

on DP3

Two digits

KH 6493 EN

61

TUNE menu: Start-up adaptation

8 TUNE menu: Start-up adaptation-CO- TUNE: Start-up adaptation
Î u EB 6493.
The purpose of the adaptation is to quickly determine the best settings for the control parameters KP, TN and TV with minimum knowledge of the process to be controlled.
TUNE-CO- ADAP

AdaptationoFF ADP.S

OFF

run ADP.S

Start-PA- ADAP
KP

Proportional-action coefficient[0.1 … 1.0 … 100.0]

TN

Reset time

[1 … 120 … 9999 s]

TV

Derivative-action time

[1 … 10 … 9999 s]

Y.JMP

Step-change value for adaptation[–100.0 … 20.0 … 100.0 %]9 I-O menu: Process data
Î u EB 6493.
You can read various variables and data in this menu. In addition, you can calibrate zeroand span for the analog inputs IN1 and IN2 as well as the analog output Y.

9.1 -CO- CIN:

Firmware version

Read the firmware version
I-O-CO- CIN

9.2 -CO- S-No:

Firmware version

Serial number

Read the serial number
I-O

62-CO- S-No

Serial number

KH 6493 EN

I-O menu: Process data

9.3 -CO- ANA:Show analog inputs and outputs

The analog values are shown in this function.
I-O-CO- ANA

Analog values

IN1

Analog input IN1

IN2

Analog input IN2

CO.VA

Controlled variable before function
generation

WE.VA

WE before function generation

FE.CO

WE after function generation

SP.CO

Set point at comparator

YPID

YPID after limitation

YOUT

Analog output

9.4 -CO- BIN:

Show binary inputs and outputs

The states of the binary input and the binary outputs are shown in this function
I-O-CO- BIN

Binary values

BI1

Binary input BI

BO1

Binary output BO1

BO2

Binary output BO2

9.5 -CO- ADJ:
outputCalibration of analog inputs and analog

Î u EB 6493.
This functions allows you to calibrate the zero and span for the analog inputs and analog
output.
The analog inputs and analog output are factory-calibrated.
I-O-CO- ADJ

Calibration

AdJ IN1

Analog input IN1

AdJ IN2

Analog input IN2AdJ YOUT

Analog output

KH 6493 EN

63

I-O menu: Process data64

KH 6493 EN

Sample applications

10 Sample applications
10.1 Temperature control
Sample application 1:
Flow temperature control of a heat exchanger(fixed set point control with Pt 100 input and mA output)
The controller receives the flow temperature (T) in the secondary circuit from a resistancethermometer (Pt 100) at the input IN2. It issues a 4 to 20 mA signal at output Y to position
the valve in the primary circuit to keep the flow temperature constant to 50 °C.
TROVIS 6493
WX
Y
4 ... 20 mA

IN2
T

Pt 100Fig. 21: Temperature control · Sample application 1

Based on the default settings, only the settings marked with  need to be changed.
PAR
Proportional-action coefficient (specific to plant)
Reset time (specific to plant) -PA

KP

= 1.0

TN

= 120 sIN
Input IN2: Input signal Pt 100

-CO-

IN2

= 100 PT

Input IN2: Lower measuring range value 0 °C

-PA-

 IN2

= 0.0 °C

 IN2

= 100.0 °C

CLAS= In2 X

Input IN2: Upper measuring range value 100 °C
Input variable X: Input IN2

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-CO-

63

Sample applications

SETP
-CO-

 -PA-

Internal set point: 50 °C

SP.VA= on WW= 50 °C

CNTR
Control mode: PI

-CO-

C.PID

= PI CP.YP

Operating direction: Increasing

-CO-

DIRE

= dir.d DI.AC

Y.VA= 4–20 mA

RE.CO= F02 MODE

Y1K1

= 0.0 %OUT
-CO-

Output signal Y: 4 – 20 mA

AUX
Restart conditions after power failure: in automatic
mode

-CO-

Start value of output variable Y

Sample application 2:
Flow temperature control of a heat exchanger(fixed set point control with Pt 100 input and three-step output)
The controller receives the flow temperature (T) in the secondary circuit from a resistancethermometer (Pt 100) at the input IN2. It issues a three-step signal to position the valve in the
primary circuit to keep the flow temperature constant to 50 °C.
The transit time of the electric actuator is 120 s.
TROVIS 6493
W
X
Y

IN2
T

Pt 100M

Fig. 22: Temperature control · Sample application 264

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Sample applications

Based on the default settings, only the settings marked with  need to be changed.
PAR
Proportional-action coefficient (specific to plant)
Reset time (specific to plant) -PA

KP

= 1.0

TN

= 120 sIN
Input IN2: Input signal Pt 100

-CO-

IN2

= 100 PT

Input IN2: Lower measuring range value 0 °C

-PA-

 IN2

= 0.0 °C

 IN2

= 100.0 °C

CLAS= In2 X

Input IN2: Upper measuring range value 100 °C-CO-Input variable X: Input IN2

SETP-COInternal set point: 50 °C

 -PA-SP.VA= on WW= 50 °C

CNTR
Control mode: PI

-CO-

C.PID

= PI CP.YP

Operating direction: Increasing

-CO-

DIRE

= dir.d DI.AC

 -CO-C.OUT= i.Fb 3.STP

-PA-

XSDY

= 0.5 %

OUT
Three-step output with internal feedback
Switching differential
Dead band
Actuator transit timeSurcharge= 2.0 %

TY

= 120 sRE.CO

= F02 MODE

Y1K1

= 0.0 %

AUX
Restart conditions after power failure: in automatic
mode

-CO-

Start value of output variable Y

Variation on sample application 2:
If the measured temperature at the analog output is to be issued as a 4 to 20 mA signal, thefollowing settings need to be changed.
OUT
Output signal Y: 4 – 20 mA
Assign output to the input variable X

KH 6493 EN

-CO-



Y.VA

= 4–20 mA

Y.SRC= on Y.X

65

Sample applications

Sample application 3:
Flow temperature control of a heat exchanger based on the outdoor temperature(follow-up control with Pt 100 input and three-step output)
The controller receives the flow temperature (T2) in the secondary circuit from a resistancethermometer (Pt 100) at the input AI2. It issues a three-step signal to position the valve in the
primary circuit to keep the flow temperature constant.
In outdoor-temperature-compensated control, the set point is determined by the outdoor temperature. In this case, the outdoor temperature T1 is measured by a resistance thermometer
Pt 100 at input AI1 and assigned to the input variable WE. The function generation of the input variable WE is used to calculate the set point for flow temperature based on the outdoor
temperature.
1

2

3

4

5

6

7

Outdoor temperature T1 in °C

–20.0

5.0

25.0

25.0

25.0

25.0

25.0

Set point for T2 in °C

80.0

50.0

20.0

25.0

25.0

25.0

25.0

TROVIS 6493

WE °C

WE

Pt 100

IN1

X

80
Y

60

T1
IN2
T2

40
20

Pt 100

T1
–20

0

20 40

°C

M

Fig. 23: Temperature control · Sample application 3

Based on the default settings, only the settings marked with  need to be changed.
PAR
Proportional-action coefficient (specific to plant)
Reset time (specific to plant)66 -PA

KP

= 1.0

TN

= 120 s

KH 6493 EN

Sample applications

IN
Input IN1: Input signal Pt 100
Input IN1: Lower measuring range value 0 °C

 -CO-PA-

Input IN1: Upper measuring range value 100 °C

IN1= 100 PT

 IN1

= 0.0 °C

 IN1

= 100.0 °C

Input IN2: Input signal Pt 100

-CO-

IN2

= 100 PT

Input IN2: Lower measuring range value 0 °C

-PA-

 IN2

= 0.0 °C

Input IN2: Upper measuring range value 100 °C

 IN2= 100.0 °C

-CO-

CLAS

= In2 X

Function generation input variable WE

 -CO-

FUNC= on WE

Lower range value of the output signal

-PA-

MIN

= 0.0 °C

Upper range value of the output signal

-PA-

MAX

= 100.0 °C

 -PA -PA-

K1.X

= –20.0 °C

K1.Y= 80.0 °C-PA- -PA -PA-

K2.X

= 5.0 °C

K2.Y

= 50.0 °C

K3.X= 25.0 °C

 -PA -PA-

K3.Y

= 20.0 °C

Input value 4

K4.X= 25.0 °C

Output value 4

 -PA-

K4.Y= 20.0 °C-PA- -PA -PA-

K5.X

= 25.0 °C

K5.Y= 20.0 °C

K6.X= 25.0 °C

 -PA -PA-

K6.Y

= 20.0 °C

Input value 7

K7.X= 25.0 °C

Output value 7

 -PA-

K7.Y= 20.0 °C

SP.VA= on WW= 25 °C

SP.VA= on WE

Input variable X: Input IN2
Input variable WE: Input IN1

Input value 1
Output value 1
Input value 2
Output value 2
Input value 3
Output value 3

Input value 5
Output value 5
Input value 6
Output value 6= In1 WE

SETP
-COInternal set point: 25 °C
Enable external set point WE

 -PA -COCNTR

Control mode: PI

-CO-

C.PID

= PI CP.YP

Operating direction: Increasing

-CO-

DIRE

= dir.d DI.AC

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67

Sample applications

OUT -CO-

Three-step output with internal feedback
Switching differential-PA-

Dead bandActuator transit time

C.OUT

= i.Fb 3.STP

XSDY= 0.5 %

Surcharge= 2.0 %

TY

= 120 sRE.CO

= F02 MODE

Y1K1

= 0.0 %

AUX
Restart conditions after power failure: in automatic
mode

-CO-

Start value of output variable Y

Activate the external set point WE in the operating level:
1. Press

until 'WE' appears on the display (WE blinks).

2. Press

and activate WE (WE stops blinking).

10.2 Pressure control
Sample application 4:
Pressure control(fixed set point control with mA input and mA output)
The controller receives the pressure downstream of the control valve as a 4 to 20 mA signal
from a transmitter at the input IN1. It issues a 4 to 20 mA signal at the output Y to position
the valve to keep the pressure constant to 6 bar. The measuring range of the transmitter is 0
to 10 bar.
TROVIS 6493
W
X
Y

IN1

4 ... 20 mA

4 ... 20 mA

P

Fig. 24: Pressure control · Sample application 468

KH 6493 EN

Sample applications

Based on the default settings, only the settings marked with  need to be changed.
PAR
Proportional-action coefficient (specific to plant)
Reset time (specific to plant) -PA

KP

= 1.0

TN

= 10 s-CO-IN1= 4–20 mA

-PA-

 IN1

= 0 bar IN1= 10 bar

CLAS= In1 X

SP.VA

= on WW= 6 barIN
Input IN1: Input signal 4 to 20 mA
Input IN1: Lower measuring range value 0 bar
Input IN1: Upper measuring range value 10 bar

Input variable X: Input IN1

 -COSETP-CO-

Internal set point: 6 bar -PACNTR

Control mode: PI

-CO-

C.PID

= PI CP.YP

Operating direction: Increasing

-CO-

DIRE

= dir.d DI.AC

Y.VA= 4–20 mA

RE.CO= F02 MODE

Y1K1

= 0.0 %

OUT
Output signal Y: 4 to 20 mA-COAUX

Restart conditions after power failure: in automaticmode
Start value of output variable Y-CO-Sample application 5:
Pressure control(follow-up control with mA input and mA output)
The controller receives the pressure downstream of the control valve as a 4 to 20 mA signal
from a transmitter at the input IN1. It issues a 4 to 20 mA signal at the output Y to position
the valve to keep the pressure constant. The external set point is issued as a 4 to 20 mA signal.
The measuring range of the transmitter is 0 to 10 bar.

KH 6493 EN

69

Sample applications

TROVIS 6493
WE IN2X

4 ... 20 mA

Y

IN1

4 ... 20 mA

4 ... 20 mA

P

Fig. 25: Pressure control · Sample application 5

Based on the default settings, only the settings marked with  need to be changed.
PAR
Proportional-action coefficient (specific to plant)
Reset time (specific to plant) -PA

KP

= 1.0

TN

= 10 sIN
Input IN1: Input signal 4 to 20 mA

-CO-

IN1

= 4–20 mA

Input IN1: Lower measuring range value 0 bar

-PA-

 IN1

= 0 bar IN1= 10 barIN2= 4–20 mA

Input IN1: Upper measuring range value 10 bar

Input IN2: Input signal 4 to 20 mA-CO-

Input IN2: Lower measuring range value 0 bar

 IN2= 0 barInput IN2: Upper measuring range value 10 bar



 IN2

= 10 bar

Input variable X: Input IN1

 -CO-

CLAS= In1 X
= In2 WE

Input variable WE: Input IN2
SETP-COInternal set point: 6 bar
Enable external set point WE

 -PA -CO-SP.VA

= on WW= 6 barSP.VA= on WE

CNTR
Control mode: PI

-CO-

C.PID

= PI CP.YP

Operating direction: Increasing

-CO-

DIRE

= dir.d DI.AC70

KH 6493 EN

Sample applications

OUT
Output signal Y: 4 to 20 mA

-CO-

Y.VA

= 4–20 mA

RE.CO= F02 MODE

Y1K1

= 0.0 %

AUX
Restart conditions after power failure: in automatic
mode

-CO-

Start value of output variable Y

Activate the external set point WE in the operating level:
1. Press

until 'WE' appears on the display (WE blinks).

2. Press

and activate WE (WE stops blinking).

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71

10.3 Abbreviations
X

Controlled variableY

Output variable

W

Internal set point (reference variable)

W2

Internal set point (reference variable)

WE

External set point (reference variable), feedforward control input value,
external position feedback

Xd

Error



Minimum value of a variableMaximum value of a variable72

KH 6493 EN

SAMSON AKTIENGESELLSCHAFT
Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany
Phone: +49 69 4009-0 · Fax: +49 69 4009-1507
samson@samsongroup.com · www.samsongroup.com

2022-07-04 · English

KH 6493 EN