EB 8389-3 EN
Translation of original instructions

EXPERTplus Valve Diagnostics
TROVIS 3730-3 Electropneumatic Positioner

Firmware version 2.00.xx
Edition January 2019

Note on these operating instructions
These operating instructions assist you in operating the device safely. The instructions arebinding for handling SAMSON devices.
ÎÎ For the safe and proper use of these instructions, read them carefully and keep them forlater reference.
ÎÎ If you have any questions about these instructions, contact SAMSON‘s After-sales Service
Department (aftersalesservice@samson.de).

The operating instructions for the devices are included in the scope ofdelivery. The latest documentation is available on our website atwww.samson.de > Service & Support > Downloads > Documentation.

Definition of signal words! DANGER
Hazardous situations which, if not avoided,
will result in death or serious injury! WARNING
Hazardous situations which, if not avoided,
could result in death or serious injury

2! NOTICE
Property damage message or malfunction
Note
Additional information
Tip
Recommended action

EB 8389-3 EN

Contents

1

Safety instructions and measures....................................................................5

1.1

Notes on possible property damage.................................................................72

Operation......................................................................................................7

2.1

On-site operation............................................................................................8

2.2

Operation using TROVIS-VIEW........................................................................83

Start-up.........................................................................................................84

Device state...................................................................................................9

4.1
4.1.1

Information parameters and limits....................................................................9Reset............................................................................................................10

4.2
4.2.1

Status classification.......................................................................................12
Reset............................................................................................................12

4.3
4.3.1

Status messages............................................................................................13Group and condensed states..........................................................................13

4.4
4.4.1

Logging........................................................................................................14
Reset............................................................................................................14

4.5
4.5.1

Temperature.................................................................................................14
Reset............................................................................................................15

5

Monitoring...................................................................................................16

5.1
5.1.1
5.1.2
5.1.3
5.1.4

Histograms...................................................................................................16
Reset............................................................................................................16
Valve position...............................................................................................17
Set point deviation........................................................................................18
Load cycle....................................................................................................19

5.2
5.2.1
5.2.1.1
5.2.2
5.2.2.1

Course of end position..................................................................................21
Course of lower end position.........................................................................21
Reset............................................................................................................22
Course of upper end position.........................................................................24
Reset............................................................................................................24

EB 8389-3 EN

3Contents

6

Tests............................................................................................................24

6.1
6.1.1
6.1.2
6.1.2.1
6.1.2.2
6.1.2.3
6.1.3
6.1.4

Step response test (PST).................................................................................24
Test cancelation criteria.................................................................................25
Test start.......................................................................................................27
Manual start.................................................................................................28
Automatic start after 'Test interval' has elapsed................................................28
Start triggered by the binary input.................................................................28
Analysis and monitoring................................................................................29
Reset............................................................................................................30

6.2
6.2.1
6.2.2
6.2.2.1
6.2.2.2
6.2.3
6.2.4

Step response test (FST).................................................................................32
Test cancelation criteria.................................................................................32
Test start.......................................................................................................33
Manual start.................................................................................................34
Start triggered by the binary input.................................................................34
Analysis and monitoring................................................................................34
Reset............................................................................................................36

6.3

Dead band...................................................................................................38

6.4

Reset............................................................................................................39

7

Error messages and recommended corrective action......................................40

4

EB 8389-3 EN

Safety instructions and measures

1 Safety instructions and measures
Intended use
EXPERTplus is a diagnostic firmware integrated into the positioner which allows the predictive, status-oriented maintenance of valves with pneumatic actuators.
EXPERTplus records the valve condition while the process is running (in automatic mode) andgenerates messages on the required maintenance work. In addition, numerous tests can be
performed in manual mode to pinpoint emerging faults.
The diagnostic functions of EXPERTplus are completely integrated into the positioner.
Diagnostic data are compiled, saved and analyzed in the positioner itself. Classified status
messages on the state of the valve are generated from the analysis.
Reasonably foreseeable misuse
While the tests are being performed, the valve does not follow the set point. Instead, it is
moved according to the test specifications. Therefore, the tests can only be started when theconditions in the plant allow it.
Qualifications of operating personnel
The devices are to be configured and set by trained and experienced personnel only. According to these operating instructions, trained personnel refers to individuals who are able
to judge the work they are assigned to and recognize possible hazards due to their specialized training, their knowledge and experience as well as their knowledge of the applicablestandards.
Personal protective equipment
No personal protective equipment is required.
Revisions and other modifications
Revisions or other modifications of the product are not authorized by SAMSON. They are
performed at the user's own risk and may lead to safety hazards, for example. Furthermore,
the product may no longer meet the requirements for its intended use.
Safety features
The software in offline mode has no influence on the connected device.

EB 8389-3 EN

5

Safety instructions and measures

Warning against residual hazards
The software in online mode has a direct influence on the connected device and, as a result,on the valve. To avoid personal injury or property damage, plant operators and operating
personnel must prevent hazards that could be caused in the control valve by the process medium, the operating pressure, the signal pressure or by moving parts by taking appropriate
precautions. They must observe all hazard statements, warning and caution notes in the referenced documents.
Responsibilities of the operator
The operator is responsible for proper operation and compliance with the safety regulations.
The operator is obliged to provide these operating instructions as well as the referenced documents to the operating personnel and to instruct them in proper operation. Furthermore, theoperator must ensure that operating personnel or third persons are not exposed to any danger.
Responsibilities of operating personnel
Operating personnel must read and understand these operating instructions as well as thereferenced documents and observe the specified hazard statements, warnings and caution
notes. Furthermore, the operating personnel must be familiar with the applicable health,safety and accident prevention regulations and comply with them.
Referenced standards and regulations
None
Referenced documentation
The following documents apply in addition to these operating instructions:−− Mounting and operating instructions (EB), safety manual (SH) and configuration manual(KH) for mounted device:u EB 8484-3 and u KH 8384-3−− Mounting and operating instructions for the associated control valve (actuator, valve andother valve accessories)

6

EB 8389-3 EN

Operation

1.1 Notes on possible property damage! NOTICE
Valve malfunction due to a configuration that does not meet the requirements of theapplication.
Settings for the EXPERTplus valve diagnostics can be made in the TROVIS-VIEW
software. In online mode of this software, the configuration and parameter settings
take effect immediately in the connected positioner and affect the control valve as aresult.
ÎÎ Only activate the online mode when configurations, parameter settings andmeasured values are to be transferred from or to the device.

2 Operation
Operation using TROVIS-VIEW/DD/DTM/eDD
EXPERTplus allows the parameters to be viewed or changed using the TROVIS-VIEW software or DD/DTM/eDD.
−− TROVIS-VIEW · SAMSON user interface used to configure various SAMSON devices−− DTM · Device type manager to describe the device and communication properties−− DD/eDD · Device description/enhanced device description
Note
All parameter settings and configurations must also be downloaded onto the positioner toallow them to become effective.

EB 8389-3 EN

7

Start-up

2.1 On-site operation

3 Start-up

Some parameters can be changed at thepositioner as well as over the user interface.
Refer to the mounting and operating
instructions of the TROVIS 3730-3 Positioner(u EB 8484-3) for a list of all parametersthat can be changed at the positioner.

The positioner must be initialized to use thefull scope of the valve diagnostics. Duringinitialization the positioner adapts itself optimally to the friction conditions and the signal
pressure required by the control valve. The
positioner can be initialized using one of thefollowing initialization modes: MAX, NOM
or MAN. All functions of EXPERTplus cannot
be used when a positioner has been initialized in the SUB mode.

2.2 Operation using TROVISVIEW
Operation using TROVIS-VIEW is describedin these operating instructions. The following
applies in this case:−− The default settings of parameters are
written in square brackets [ ].
−− Operation applies to the 'Diagnosis' userlevel.
Note
The installation and operation of the
TROVIS-VIEW software is explained in detailin the Operating Instructions u EB 6661.
These instructions are available on theInternet and in the [?] menu in TROVISVIEW.
Tip
The [Find...] function in the menu bar can beused to look for parameters:

1. Connect the positioner with the configuration and operating software.
ÎÎ The TROVIS-VIEW software on acomputer can be connected to thepositioner using an isolated USB
interface adapter (order no. 14009740).
2. Put the positioner into operation as described in the Mounting and Operating
Instructions u EB 8484-3.
When initialization fails, the positioner
generates a status message with theassigned status classification. See
section 4.
If a status message is generated duringinitialization, the group status 'Start-up'
and 'Initialization' are also generated
with the assigned status classification.
See section 4.
> Diagnosis/maintenance > Device state >Status classification−−Start-up:
, , ,

8

,

, [Highest classification]

EB 8389-3 ENDevice state−−Initialization:, , , ,

3. Read out positioner data.
, [Highest classification]−−Init: incorrect operating mode: [,−−Init: travel too small:

,[

],

],

,

,

,

,

,

ÎÎ In TROVIS-VIEW: select menu [Device> Read].

,−−Init: rated travel not achieved:, [ ], , ,−−Init: pin position:,[−−Init: no movement:

,[

],

,
],

,
,

,

−−Init: canceled (control accuracy):, , [highest classification],−−Init: low control accuracy:, [highest classification]

,

,

,

,

−−Positioner not initialized:

,

,[

],

,

−−Init: canceled externally:

,[

],

,

,

−−Init: angle limitation:, , , , , [highest classification]−−Init: timeout:, , , ,

, [highest classification]> Diagnosis/maintenance > Device state >Status messages−−Start-up−−Initialization error−−Init: incorrect operating mode−−Init: travel too small−−Init: rated travel not achieved−−Init: no movement−−Init: pin position−−Init: canceled (control accuracy)−−Init: low control accuracy

4 Device state
4.1 Information parameters
and limits[> Diagnosis/maintenance > Device state]contains information parameters on the positioner state and the limits used to generate
status messages.
Stress factor
The stress factor range is directly linked to
the load cycle histogram. See section 5.1.4.
The load on the bellows and/or packing canbe read from the 'Dynamic stress factor' parameter.
−− 'Dynamic stress factor'−− 'Stem seal'−−Init: positioner not initialized> Diagnosis/maintenance > Device state−−Init: canceled externally−−Stem seal: Self-adjusting, Adjustable, Bellows, Other, [Not selected]−−Init: angle limitation−−Init: timeout

EB 8389-3 EN

9Device state

Total valve travel−− 'Total valve travel': totaled full valve travel cycle−− 'Total valve travel limit': the 'Total valve
travel' status message is generated when
the total valve travel exceeds the limit.
> Diagnosis/maintenance > Device state−−Total valve travel:
1000 to 90,000,000, [1,000,000]

Set point deviation−− 'Lag time for set point deviation': the lagtime is determined during initialization. It
is the reset criterion for the 'Set point deviation' status message.
A transit time of less than 180 s determined during initialization causes the'Lag time of set point deviation' to be set
to 30 s. A transit time of 180 s or moredetermined during initialization causes
the 'Lag time of set point deviation' to be
set to six times the transit time.

Temperature−− See section 4.5 for [Temperature] folder.
Time−− 'Operating hours counter'−− 'Device switched on since last initialization'−− 'Device in closed-loop operation'−− 'Device in closed-loop operation sincelast initialization'
Counter−− 'Number of initializations'−− 'Number of zero calibrations'Save−− 'Diagnostic data': the diagnostic data are saved in a non-volatile memory(EEPROM).

4.1.1

Reset

'Reset(standard)''Reset(advanced)'

RestartResetinitialization

ÎÎ Refer to Table 1'Resetdiagnosis'−− 'Tolerance band for set point deviation+/-': a set point deviation is recognized
as a system deviation when the valve po-sition deviates from the set point by thevalue adjusted in this parameter.

Reset information parameters without operating hours
counter

NO

YES

YES

NO

NO

Reset operating hours counter

NO

NO

NO

NO

NO

Reset limits

NO

YES

YES

NO

NO

Table 1: Reset in[> Diagnosis/maintenance > Device state]

1)

10Reset depending on limit

EB 8389-3 ENDevice stateFig. 1: > Diagnosis/maintenance > Device state

EB 8389-3 EN

11

Device state

4.2 Status classification
A status classification is assigned to the status messages of the EXPERTplus valve diagnostics. This assigned status appears when astatus message is generated.

Priority

The following classifications are possible:−−

No message
If an event is classified as ‘No message’, this event does not have any
affect on the condensed state.

−−

Maintenance required
The positioner still performs its control task (with restrictions). A maintenance demand has been determined.
The wear tolerance will soon be exhausted or is reducing at a faster rate
than expected. Maintenance is necessary in the medium term.

−−

Out of specification
The positioner is running outside thespecified operating conditions or has
not yet been initialized.

−−

Function check
Test or calibration procedures are
performed in the positioner. The positioner is temporarily unable to perform its control task as long as theprocedure is taking place.

−−12−− Highest classification
Status classification of a group status(see section 4.3.1). The group status depends on the status classification assigned to the status messages: the status
message with the highest classification
determines the group status.
Note
In the 'On-site: write' TROVIS-VIEW userlevel, the active status messages arevisible. In some cases, only the active
group status is visible without theassigned status messages.
The status classification is predetermined in[> Diagnosis/maintenance > Device state >Status classification]. All status messages are
assigned to a status by default.
Note
The 'Out of specification' status is assigned
to a positioner that has not yet been initialized.

4.2.1

Reset

ÎÎ Refer to Table 2

FailureThe positioner cannot perform its
control task due to a functional fault
in the positioner itself or in one of its
peripherals.

EB 8389-3 ENTable 2: Reset in [> Diagnosis/maintenance >Device state > Status classification]'Resetdiagnosis''Reset(standard)''Reset(advanced)'

RestartResetinitialization

Device state

Reset status classification

NO

NO

YES

NO

NO

4.3 Status messages
The valve diagnostics integrated into the positioner generates classified status messages.
All status messages with their assigned status
are listed in [> Diagnosis/maintenance >Device state > Status classification].
Note
The '
No message' status is generated
when:−−The conditions to generate a status message are not fulfilled.
−−The conditions to generate a status message are fulfilled, but the status message isassigned the 'No message' status.
ÎÎ We recommend following the instructions
listed in the Appendix when a status
message occurs.

4.3.1

Group and condensed
statesTo provide a better overview on the individual status messages, various status messages
are summarized in a group status. If a status
message assigned to a group is active, thegroup status is generated according to thepredefined status classification.
The condensed state is summary of all status
messages. To provide a better overview on
the condition of the valve, all status messages are summarized in a condensed state
which is made up from a summary of allclassified messages in the positioner. The status message with the highest priority determines which condensed state is set. The status message with the highest priority determines the condensed state.
Tip
The condensed state is indicated on theright-hand corner of the status bar in
TROVIS-VIEW.

EB 8389-3 EN

13

Device state

4.4 Logging

4.5 Temperature

EXPERTplus can log up to 400 events. They
are listed in [> Diagnosis/maintenance >Device state > Logging] together with additional information on the event and the time
it occurred.

The temperature inside the device is displayed:

Logging starts automatically. It does notneed to be activated by the user.
For example, the following events arelogged:−− The positioner was started up.
−− The positioner was successfully initialized.
−− EXPERTplus generates a status message.
−− A generated status message has beencanceled.
−− A test was successfully completed.
Tip
Use [Find...] function to find a certain event:

Note
When the 'Log 'No message' (NAMUR
classification)' parameter is activated, events
are also logged even when their statusclassification is set to 'No message'. The
activation does not affect the issuing of status
messages.

4.4.1

Reset

ÎÎ Refer to Table 3

14−− 'Temperature inside device': current temperature inside the device−− 'Min. temperature inside device': thelowest temperature inside the device
while in service−− 'Max. temperature inside device': thehighest temperature inside the device
while in service−− 'Minimum temperature limit': the 'Temperature inside device below min. limit'
status message is generated with the assigned status classification when the temperature inside the device falls below thelimit. The status message is canceled assoon as the temperature rises above thelimit again.
−− 'Maximum temperature limit': the 'Temperature inside device above max. limit'
status message is generated with the assigned status classification when the temperature inside the device exceeds thelimit. The status message is canceled assoon as the temperature falls below thelimit again.
Note
The 'Minimum temperature limit' and 'Maximum temperature limit' parameters are set to–60 °C and 80 °C respectively by default.
These settings can only be changed in the'Customer expert' user level.

EB 8389-3 ENDevice state

4.5.1

Reset

RestartResetinitialization

YES

NO

NO

Table 4: Reset in [> Diagnosis/maintenance >Device state > Temperature]
Reset temperature values

NO

NO

1)

1)

Reset
initialization'Reset(advanced)'

YES

Restart'Reset (standard)'

NO'Reset(advanced)''Reset diagnosis'

YES'Reset (standard)'

Reset logging'Reset diagnosis'

Table 3: Reset in [> Diagnosis/maintenance >Device state > Logging]'Reset logging'ÎÎ Refer to Table 4

NONO

YES = 'Minimum temperature limit' and 'Maximum temperature limit'
NO = 'Temperature inside device', 'Min. temperature inside device' und 'Max. temperature insidedevice'Fig. 2: > Diagnosis/maintenance > Device state > Logging

EB 8389-3 EN

15

Monitoring

5 Monitoring
Monitoring compiles data while the process
is running without disrupting the process.
The data are saved and analyzed in the positioner, i.e. the positioner follows the set
point to position the valve. A classified status
message is generated when the positioner
detects an event.

5.1 Histograms
Histograms are statistical analysis which are
performed by the positioner in the AUTO
and SAFE modes. For this purpose, data arelogged every second and saved in a
non-volatile memory every 24 hours.
Data logging and analysis do not need to be
activated.
EXPERTplus has histograms on the following
topics:−− Valve position (see section 5.1.2)−− Set point deviation (see section 5.1.3)−− Load cycle (see section 5.1.4)−− Drop-down menu: [Service life], Days,
Weeks, Months, Years−− Slider:Days: [Today], Yesterday, Day before
yesterday, Three days ago, …, Six daysago
Weeks: [This week], Last week, Week before last, Three weeks ago
Months: [This month], Last month, Monthbefore last, Three months ago, …, Elevenweeks agoYears: [This year], Last year, Year before
last, Three years ago, …, Five years ago

5.1.1

Reset

The valve position, set point deviation andload cycle histograms are all reset. It is notpossible to reset single histograms.

Table 5: Reset the valve position, set point
deviation and load cycle histograms.

'Resetdiagnosis''Reset(standard)''Reset(advanced)'

RestartResetinitialization

ÎÎ Refer to Table 5'Reset histograms'

The histograms can be displayed for different monitoring periods. The monitoring periods are defined in the drop-down menu andusing the slider at the bottom of the histogram:Reset measured data

YES

YES

YES

YES

NO

NO

16

EB 8389-3 EN

Monitoring

5.1.2

Valve position

The valve position histogram provides information about the range in which valve mainly works during its service life and whether
the operating range is possibly shifting.
The positioner records the valve position every second and assigns the data into predefined valve position classes. The distribution showing how often the sound level occurred within a valve position class is shownin a bar graph.
Analysis and monitoring
The first and last class indicate how often the'End position w ≤' and 'End position w ≥'functions have been triggered.

when the valve position reaches an adjustable set point.
−− The 'End position w ≥' function causes
the valve to move to the open position
when the valve position reaches an adjustable set point.
The functions can be adjusted in[> Configuration > Set point processing].
A valve position that is mainly located close
to the closed or open position pinpoint to avalve that is too large or too small.
ÎÎ We recommend checking the valve sizing.

−− The 'End position w ≤' function causes
the valve to move to the closed position

Fig. 3: > Diagnosis/maintenance > Monitoring > Histograms > Valve position

EB 8389-3 EN

17

Monitoring

5.1.3

Set point deviation

The set point deviation histogram provides
information on to which extent a set point
deviation has occurred and whether faults
may occur due to a restricted working range.
The positioner records the set point deviation
every second and assigns the data into predefined classes. The distribution showing
how often the set point deviation remained
within a class is shown in a bar graph.
Analysis and monitoring
Ideally, the set point deviation should be as
close to 0 % as possible.
Set point deviations greater than 1 % following in quick succession pinpoint to a limitation of the upper working range.

ÎÎ We recommend checking the attachment.
Set point deviations smaller than 1 % following in quick succession pinpoint to a limitation of the lower working range or to seatleakage.
ÎÎ We recommend checking the attachment
as well as the seat and plug for wear.
If almost all set point deviations during theshort-term monitoring are greater than 1 %or smaller than –1 %, this may indicated thatthe actuator or valve stem is jammed.
ÎÎ We recommend checking the plug stem
for external influences that could beblocking it.

Fig. 4: > Diagnosis/maintenance > Monitoring > Histograms > Set point deviation

18

EB 8389-3 EN

Monitoring

5.1.4

Load cycle

The load cycle histogram provides a statistical analysis of the cycles that the valve has
moved through. As a result, the cycle counter
also provides information on the dynamic
stress of a bellows seal and/or packing.
The positioner records the height of thecycles that the valve has moved throughtaking the selected stem seal into account.
The cycles are assigned to classes. The distribution showing how often the cycle occurred
within a class is shown in a bar graph.
Note
A valve cycle span starts at the point wherethe valve stroke changes direction until the
point where it changes direction again.

x [%]
1

3

2

4
t [s]

> Diagnosis/maintenance > Device state−−Stem seal: [Not selected], Self-adjusting, Adjustable, Bellows, Other! NOTICE
No analysis of 'Dynamic stress factor' with
'Stem seal' = ‘Not selected’ (= default setting).
Set 'Stem seal' parameter to allow an analysis of the load cycle histogram to be performed.

Fig. 5: > Diagnosis/maintenance > Monitoring > Histograms > Load cycle

EB 8389-3 EN

19

Monitoring

Analysis and monitoring> Diagnosis/maintenance > Device state

The load on the bellows and/or packing canbe read from the 'Dynamic stress factor' parameter. The value is determined from the cycle spans or cycle heights and takes into account the type of packing used in the valve.

−−Dynamic stress factor

A 'Dynamic stress factor exceeded' status
message is generated with the assigned status classification whenever:−− The number of measured cycle spans exceeds 2,000,000 when 'Self-adjusting' isselected as the stem seal.
−− The number of measured cycle spans exceeds 800,000 when 'Adjustable' is selected as the stem seal.

> Diagnosis/maintenance > Device state >Status classification−−Dynamic stress factor exceeded:, [ ], , ,> Diagnosis/maintenance > Device state >Status messages−−Dynamic stress factor exceededÎÎ We recommend checking the conditionof the packing when the status message
is generated to prevent external leakage.

−− The number of measured cycle spans exceeds 90 % of the 'Max. cycle count'when 'Other' is selected as the stem seal.
−− The number of measured cycle heights
exceeds 8473930 when 'Bellows' is selected as the stem seal.
Tip
The level of stress that the packing is exposed to depends on other factors besides
load cycles, e.g. on the process medium andthe operating conditions. Therefore, in the'Customer expert' user level, it is possible toadapt the limits to trigger the 'Dynamic stressfactor exceeded' status message as required.

20

EB 8389-3 EN

Monitoring

5.2 Course of end position
Data are recorded in the background regardless of the operating mode selected
when the conditions for logging data are fulfilled (see sections 5.2.1 and 5.2.2). Data
logging does not need to be activated.
The course of end position function records
the measured data when the valve moves tothe end position:−− Valve position−− Temperature−− Time stamp of operating hours counter
The new recorded end position is comparedto the last saved end position. If the valve
position deviates by 0.3 % from the last value, the data of the new end position are
saved.
A graph of the recorded end positions isplotted over time.
The positioner saves the valve positions in acircular buffer, which holds 30 measured
values at one time.
Analysis and monitoring
The 'Course of lower end position' and'Course of upper end position' status messages are generated with the assigned statusclassification whenever a new recorded end
position deviates from the reference value by
the 'Threshold for end position shift'. The reference value is determined during initialization (see sections 5.2.1 and 5.2.2). It isshown as a straight line in the graph.

> Diagnosis/maintenance > Monitoring >Course of end position−−Threshold for end position shift:
0.3 to 100.0 %, [5.0 %]Note
When temperature fluctuations occur andwith valves with a long insulating section, the'Course of lower end position' and 'Courseof upper end position' status messages may
be generated at an early stage.

5.2.1

Course of lower end position

To record data for the course of lower end
position (behavior during tight closing), thefollowing conditions must exist:−− The positioner was initialized in the MAX
or NOM mode.
−− The tight-closing function is active ('Lower end position' parameter = 'Activated').
> Configuration > Set point processing−−Lower end position: [Activated]

Note
When the end position function is active, thevalve shuts off tightly as soon as the set point
is lower or equal to the value entered in 'End
position w <='.
The reference value for the course of the lower end position is reference zero. This is de-EB 8389-3 EN

21

Monitoring

termined during a MAX or NOM initialization and during a zero calibration.

−−Lower end position shifted

Note
The 'Lower end position shifted' status message is generated briefly after the initialization of soft-seated valves for design reasons.
The soft seal settles after a few load cycles
causing zero to be shifted. In these valves, a
repeated generation of the status message
after a long time service first indicates signs
of wear.

The generation of the 'Lower end position
shifted' status message in combination witha shift of the course of the end position
downward pinpoints to signs of wear between seat and plug in metal-seated valves.

The generation of the 'Lower end position
shifted' status message in combination witha shift of the course of the end position upward pinpoints to a blockage of the plug
stem, e.g. due to dirt particles.

ÎÎ We recommend checking the seat andplug for wear.

ÎÎ We recommend checking the plug stem
for mechanical blockage.

> Diagnosis/maintenance > Device state >Status classification−−Lower end position shifted:, [ ], , ,> Diagnosis/maintenance > Device state >Status messages

5.2.1.1 Reset

Reset reference
value
Reset
measured data
Reset status
message

22

Reset initialization

Restart'Reset (advanced)''Reset (standard)''Reset diagnosis''Reset course ofend position'

Table 6: Reset the course of end
position

Zero calibration

ÎÎ Refer to Table 6

Lower end position

YES

NO

NO

YES

YES

NO

YES

Upper end position

NO

NO

NO

YES

YES

NO

YES

Lower end position

NO

YES

YES

YES

YES

NO

YES

Upper end position

NO

YES

YES

YES

YES

NO

YES

Lower end position

YES

NO

YES

YES

YES

NO

NO

Upper end position

NO

NO

YES

YES

YES

NO

NO

EB 8389-3 EN

Monitoring

Fig. 6: > Diagnosis/maintenance > Monitoring > Course of lower end position

Fig. 7: > Diagnosis/maintenance > Monitoring > Course of upper end position

EB 8389-3 EN

23

Tests5.2.2

Course of upper end
position

The positioner must be initialized in the MAX
mode to allow course of end position data to
be recorded.
The reference value for the course of the top
zero point is the travel at the open valve position. It is determined only in the MAX initialization mode.
Analysis and monitoring
If the analysis of course of the upper end position pinpoints a fault, the positioner generates the 'Upper end position shifted' status
message with the assigned status classification.
> Diagnosis/maintenance > Device state >Status classification−−Upper end position shifted:, [ ], , ,> Diagnosis/maintenance > Device state >Status messages−−Upper end position shiftedÎÎ We recommend checking the plug stem
for mechanical blockage when the status
message is generated.

5.2.2.1 ResetÎÎ Refer to Table 624

6 Tests
Similar to the monitoring, data are compiled, saved and analyzed in the positioner
for the tests. However, in this case, the valve
position is not determined by the set point,
but by the active test. The tests can only be
started when the conditions in the plant allow it (e.g. plant shutdown or service workin the workshop). For reasons of safety, thesetests, except for step response test (PST), canonly be performed in the MAN mode.
Note
An active test is stopped and the positioner
changes to the fail-safe position when theelectrical signal falls below a certain level orwhen the forced venting function is triggered.

6.1 Step response test (PST)
Note
Depending on the software version, theterms “Step response test (SRT)”, “step response (PST)” or “partial stroke test (PST)”
are used. They all refer to the same test.
The step response test (PST) is particularly
suitable for the status-oriented detection of
malfunctions in pneumatic shut-off valves. As
a result, the probability of failure on demand(PFD) can be reduced and it may be possible
to extend maintenance intervals. A shut-off
valve normally in its end position can beprevented from seizing up or getting

EB 8389-3 EN

Testsjammed. The initial breakaway torque mustfirst be overcome after the valve starts tomove from its end position. The initial breakaway torque depends on the plug/seat seal,
deposits on the plug, the process medium
and friction at the valve trim. After the initial
breakaway torque has been overcome, it
can be assumed that the valve is able toclose completely. The recording of the test results additionally allows an analysis of the
dynamic control response.
During the step response test, the valve
moves from its current operating point by thedefined change in travel and back to the initial position again. The change in travel iscalculated from the 'Start value' and 'Stepheight'.
The change in travel can be performed either in steps or in a ramp function (Fig. 8).
The test is performed with the ramp function
when the ramp times ('Ramp 1' and 'Ramp2') are set to ≠ 0 s.
The test starts after reaching the 'Start value'
and the 'Waiting time' has elapsed. Startingfrom the 'Start value', the valve moves
through the 'Step height' in the 'Test direction'. The valve remains in this position for
the time defined in 'Waiting time' before
performing a second step change in the opposite direction to the operating point. The'Sampling time' defines the time interval between which the measured values are recorded during the test.

> Diagnosis/maintenance > Tests > Step
response test (PST) > Configuration−−Start value: –20 to 120 %, [100 %]−−Step height: 2 to 100 %, [10 %]−−Test direction: [Minus], Plus−−Ramp 1: 0 to 9999 s, [60 s]−−Ramp 2: 0 to 9999 s, [6 s]−−Waiting time: can only be selected in the 'Customer expert' user level−−Sampling rate (not write-enabled)

6.1.1

Test cancelation criteria

Various test cancelation conditions provide
additional protection against the valve slamming shut or moving further than step height.
The positioner cancels the step response testwhen one of the following cancelation conditions is fulfilled:Time−− 'Canceled: max. test duration': the test iscanceled when the maximum permissible
test duration is reached.
> Diagnosis/maintenance > Tests > Step
response test (PST) > Configuration−−Canceled: max. test duration (not writeenabled)−− 'Canceled: max. dead time': the test iscanceled when the adjusted 'Waiting
time' has elapsed without the valve having moved by the value 'Dead time limit
determined'.
This cancelation criterion only takes effect when 'Dead time limit determined' is
set to ≠ 0 %.

EB 8389-3 EN

25

Tests> Diagnosis/maintenance > Tests > Step
response test (PST) > Configuration−−Canceled: max. dead time (not writeenabled)−−Dead time limit determined: can only be
selected in the 'Customer expert' user level

Tolerance bands−− 'Start value of tolerance band +/–': thetest is not started when the operating
point is outside the range: 'Start value' ±'Start value of tolerance band +/–'.
> Diagnosis/maintenance > Tests > Step
response test (PST) > Configuration−−Start value of tolerance band +/–:
1 to 100 %, [3 %]−− 'Canceled: tolerance band (ramp) +/–','Canceled: tolerance band (step) +/–':The test is canceled as soon as the deviation of the valve position (in relation to
the theoretical step end value, calculated
from the 'Start value' and 'Step height')
exceeds the adjusted value.
This cancelation criterion only takes effect when 'Canceled: tolerance band(ramp) +/–' or 'Canceled: tolerance
band (step) +/–' is set to ≠ 0 %.
> Diagnosis/maintenance > Tests > Step
response test (PST) > Configuration−−Canceled: tolerance band (step) +/–:
can only be selected in the "Customer
expert" user level−−Canceled: tolerance band (ramp) +/–:
1 to 100 %, [5 %]Test start

Test start

Operating point
Start value
Step height

2 x Start value
Tolerance band +/–x [%]Waitingtime

Waiting
time

t [s]

Waitingtime

Waitingtime
Ramp 1

Ramp 2

Fig. 8: Course of the step response test (PST): step response (left) and ramp function (right)

26

EB 8389-3 EN

Tests−−Canceled: x monitoring: –20 to 120 %,[ATO: 85 %; ATC: 15 %]Notes on cancelation criteria−−The step response test must only be
performed with the cancelation conditions(time or valve position) for valves withdouble-acting actuator and pneumatic
booster as well as for valves that havebeen initialized using the SUB mode.
−−Excessive overshooting may occur in valvesfitted with volume boosters. In this case, thetest cancelation criteria 'Canceled: xmonitoring' and 'Canceled: tolerance band(ramp) +/–' or 'Canceled: tolerance band(step) +/–' must be increased accordingly.
The reason why the test was canceled can beread in the 'Results of last test' parameter.
Besides cancelation due to the adjusted test
cancelation criteria, further events lead tothe test being canceled, for example:

EB 8389-3 EN

ÎÎ On site by pressing the rotary pushbutton
ÎÎ By software with the 'Stop test' parameter−− The positioner switches to the SAFE
mode.
−− At the start of the step response test triggered by the binary input, the edge control changes again to the state whichstarts the step response test.
−− In AUTO mode, the edge control changes to the state in which the valve moves
to a fixed value which is outs the range:'Start value' ± 'Start value of tolerance
band +/–'.

6.1.2

Test start

Table 7: Start conditions of step response
test (PST)
Start triggered by thebinary input (seesection 6.1.2.3)> Diagnosis/maintenance > Tests > Step
response test (PST) > Configuration−− The test is manually canceled:

Automatic start after 'Test
interval' has elapsed (seesection 6.1.2.2)

This cancelation criterion only takes effect when 'Canceled: x monitoring' is set
to ≠ 0 %.

−− The current is lower than 3.8 mA.

See section 6.1.2.1 formanual start (on site orusing software)−− 'Canceled: x monitoring': the test iscanceled when 'Minus' is selected as the'Test direction' as soon as the valve
position falls below the adjusted value.
The test is canceled when 'Plus' isselected as the 'Test direction' as soon as
the valve position exceeds the adjusted
value.

−− The internal forced venting function istriggered.

Operating mode

Valve position

AUTO

YES

YES

YES

MAN

YES

NO

YES

27

Tests

6.1.2.1 Manual startOn-site operation

ÎÎ Use the rotary pushbutton to go to the'Step response test (PST)' command(menu item: [10 Diagnosis/maintenance> Tests]). See u EB 8484-3.
ÎÎ Pressto start test.

Note
A test can be canceled manually by pressing
the rotary pushbutton again.
Software command via TROVIS-VIEW/
integration> Diagnosis/maintenance > Tests > Step
response test (PST)!! Start PSTNote
The test can be manually canceled by selecting the 'Stop test' command.

6.1.2.2 Automatic start after 'Test
interval' has elapsed
The step response test (PST) is started in
AUTO mode regularly after the time enteredin 'Test interval' has elapsed when thefunction is activated. The 'Delay timeinterval' parameter allows the test to be
postponed once.
Note
The time until the next regular test can beadapted in the 'Time until next test' information parameter.
> Diagnosis/maintenance > Tests > Step
response test (PST) > Configuration−−Test interval: 1 to 365 d, [7 d]−−Activate test interval: [Not active], Active−−Delay test interval: [0] to 2160 h> Diagnosis/maintenance > Tests > Step
response test (PST)−−Time until next test (not write-enabled)

6.1.2.3 Start triggered by thebinary input
Function only when positioners have the optional binary input (option A or B).
> Configuration > Options−−Action upon active binary input: start PST−−Edge control: [Active = switch closed], Active =switch open

28

EB 8389-3 EN

Tests6.1.3

Analysis and monitoring

The analyses of the last fifty step response
tests (PST) are saved with a time stamp in [>Diagnosis/maintenance > Tests > Step
response test (PST) > Reports and diagrams].
The last seven graphs at the maximum areshown.
The result of the last test can be read in [>Diagnosis/maintenance > Tests > Step
response test (PST).

Note
In total, seven step response tests (PST plus
FST) with report and diagram can be displayed.
Test completed successfully
The following analysis parameters are shown
after a completed step response test (PST).
Two test reports can be shown at one time
for comparison. The comparison test can beselected as required.

Fig. 9: > Diagnosis/maintenance > Tests > Step response test (PST) > Reports and diagrams

EB 8389-3 EN

29

Tests> Diagnosis/maintenance > Tests > Step
response test (PST) > Reports and diagrams> Diagnosis/maintenance > Device state >Status classification−−Time stamp (not write-enabled)−−PST: cancelation criteria met:
, [ ], , ,−−Dead time (not write-enabled)−−T86 (not write-enabled)−−Overshooting (not write-enabled)−−PST: start criteria not met:[ ], , , ,−−Min./max. manipulated variable (fill with air/
venting)> Diagnosis/maintenance > Device state >Status messages−−Test status (not write-enabled)−−PST: cancelation criteria met

The results of the first step response test performed with the current configuration areused as a reference test and are write-protected. All other step response tests can be
write-protected manually:−−PST: start criteria not met

ÎÎ Checkbox.

Test not completed
If the test is canceled and no results are produced which activate the fail-safe position,
the positioner changes to the 'Target operating mode'.
The fail-safe position can be activated, forexample when the forced venting is triggered
and when the current is lower than 3.8 mA.
A test cancelation causes the 'PST: cancelation criteria met' status message to be generated with the assigned status classification.

ÎÎ Recommended action when the test iscanceled (see Table 8)
Statistical analysis
Every time a step response test is started,
one of the following counters counts thisevent depending on the test status.
> Diagnosis/maintenance > Tests > Step
response test (PST)−−Number of successful tests (not write-enabled)−−Number of canceled tests (not write-enabled)−−Number of failed start criteria (not writeenabled)

6.1.4

Reset

ÎÎ Refer to Table 9

If the test cannot be started, the 'PST: start
criteria not met' status message with the assigned status classification is generated.
Note
No graph is plotted when a test cannot be
started.

30

EB 8389-3 EN

TestsTable 8: Recommended action when the status message is generated

PST: cancelation
criteria
met

Test result

We recommend:

Current

ÎÎ Check input signal

Internal error

ÎÎ Restart test

Timeout
No movement possible

PST: start
criteria
not metÎÎ Check seat and plug for deposits or foreign particles

Start criteria

ÎÎ Check test configuration

Function activeÎÎ Wait for the active test to finish and restart test.

Incorrect operating modeÎÎ Set operating mode corresponding to Table 7 andrestart test.

'Reset diagnosis'

Reset PST
configuration'Clear reports''Reset (standard)''Reset (advanced)'

RestartReset initialization

Table 9: Reset step response test

Reset configuration

NO

YES

NO

YES

YES

NO

YES

Clear reports

YES

YES

YES

YES

YES

NO

NO

Reset histograms

YES

YES

YES

YES

YES

NO

NO

Reset reference test

YES

YES

NO

YES

YES

NO

YES

Reset status messages

YES

YES

NO

YES

YES

NO

NO

EB 8389-3 EN

31

Tests

6.2 Step response test (FST)
Note
Depending on the software version, theterms “Step response test (SRT-100 %)”, “stepresponse (FST)” or “full stroke test (FST)” areused. They all refer to the same test.
The dynamic valve performance can be evaluated by performing the test. During the step
response test (FST), the valve moves throughits entire working range.
The valve can move through the working
range either in steps or with a ramp function(Fig. 10). The test is performed with theramp function when the ramp time ('Ramp')
is set to ≠ 0 s.

End value
Tolerance band +/–Start value
Tolerance band +/–x [%]Test start

The test starts after the 'Waiting time' haselapsed. This ensures that the valve hasreached the open position.
Starting from the open position, the valve
moves to the closed position. The valve remains in this position for the time defined by
the 'Waiting time' before performing a second step change in the opposite direction
from the closed position to the open position.
The 'Sampling time' defines the time interval
between which the measured values are recorded during the test.
> Diagnosis/maintenance > Tests > Step
response test (FST) > Configuration−−Ramp 1: 0 to 9999 s, [60 s]−−Waiting time: can only be selected in the'Customer expert' user level

Test start

100

0
Waitingtime

Waiting
time

t [s]

Waitingtime

Waiting
time
Ramp

Ramp

Fig. 10: Course of the step response test (FST): step response (left) and ramp function (right)

32

EB 8389-3 EN

Tests−− The current is lower than 3.8 mA.
−− The test is manually canceled:ÎÎ On site by pressing the rotary pushbutton

Time−− 'Canceled: max. test duration': the test iscanceled when the maximum permissible
test duration is reached.
> Diagnosis/maintenance > Tests > Step
response test (FST) > Configuration−−Canceled: max. test duration (not writeenabled)

Tolerance bands−− 'Start value of tolerance band +/–': thetest is not started when the operating
point is outside the range: open position– 'Start value of tolerance band'.
> Diagnosis/maintenance > Tests > Step
response test (FST) > Configuration

ÎÎ By software with the 'Stop test' parameter−− The positioner switches to the SAFE
mode.
−− At the start of the step response test triggered by the binary input, the edge control changes again to the state whichstarts the step response test (FST).

6.2.2

Table 10: Start conditions of step response
test (FST)−−Start value of tolerance band +/–:
1 to 100 %, [3 %]−− 'End value of tolerance band +/–': thetest is not started when the valve position
after the first step does not reach therange: closed position + 'End value oftolerance band +/–'.
> Diagnosis/maintenance > Tests > Step
response test (FST) > Configuration−−End value of tolerance band +/–: 1 to
100 %, [3 %]Test start

1)

Start triggered by thebinary input (seesection 6.2.2.2)

The positioner cancels the step response test
(FST) when one of the following cancelation
conditions is fulfilled:−− The internal forced venting function istriggered.

See section 6.2.2.1 formanual start (on site orusing software)

Test cancelation criteria

Operating mode

6.2.1

AUTO

NO 1)

NO 1)

MAN

YES

YES

Default setting
By activating the 'Allow start in AUTO mode'parameter in the "Customer expert" user level,
the test can also be started in AUTO mode.

Additionally, the step response test (FST) is
canceled when one of the following events
arises:EB 8389-3 EN

33

Tests

6.2.2.1 Manual startOn-site operation

6.2.2.2 Start triggered by thebinary input
Function only when positioners have the optional binary input (option A or B).
> Configuration > Options−−Action upon active binary input: start FST

ÎÎ Use the rotary pushbutton to go to the'Step response test (FST)' command(menu item: [10 Diagnosis/maintenance> Tests]). See u EB 8484-3.
ÎÎ Pressto start test.

Note
A test can be canceled manually by pressing
the rotary pushbutton again.
Software command via TROVIS-VIEW/
integration> Diagnosis/maintenance > Tests > Step
response test (FST)!! Start FSTNote
The test can be manually canceled by selecting the 'Stop test' command.

34−−Edge control: [Active = switch closed], Active =switch open

6.2.3

Analysis and monitoring

The analyses of the last six step response
tests (FST) at the maximum and graphs are
saved with a time stamp in [> Diagnosis/
maintenance > Tests > Step response test
(FST) > Reports and diagrams].
The result of the last test can be read in [>Diagnosis/maintenance > Tests > Step response test (FST).
Note
In total, seven step response tests (PST plus
FST) with report and diagram can be displayed.
Test completed successfully
The following analysis parameters are shown
during a completed step response test (FST).
Two test reports can be shown at one time
for comparison. The comparison test can beselected as required.

EB 8389-3 EN

Tests> Diagnosis/maintenance > Tests > Step
response test (FST) > Reports and diagrams−−Time stamp (not write-enabled)−−Dead time (rising) (not write-enabled)−−Dead time (falling) (not write-enabled)−−T86 (rising) (not write-enabled)

The results of the first step response test (FST)
performed with the current configuration areused as a reference test and are write-protected. All other step response tests can be
write-protected manually:
ÎÎ Checkbox.

−−T86 (falling) (not write-enabled)−−T98 (rising) (not write-enabled)−−T98 (falling) (not write-enabled)−−Test status (not write-enabled)

Fig. 11: > Diagnosis/maintenance > Tests > Step response test (FST) > Reports and diagrams

EB 8389-3 EN

35

TestsTest not completed

Statistical analysis

If the test is canceled and no results are produced which activate the fail-safe position,
the positioner changes to the 'Target operating mode'.

Every time a step response test is started,
one of the following counters counts thisevent depending on the test status.

The fail-safe position is activated when theforced venting is triggered and when the current is lower than 3.8 mA.
A test cancelation causes the 'FST: cancelation criteria met' to be generated status
message with the assigned status classification.
If the test cannot be started, the 'FST': start
criteria not met' status message with the assigned status classification is generated.

> Diagnosis/maintenance > Tests > Step
response test (FST)−−Number of successful tests (not write-enabled)−−Number of canceled tests (not write-enabled)−−Number of failed start criteria (not writeenabled)

6.2.4

Reset

ÎÎ Refer to Table 12Note
No graph is plotted when a test cannot be
started.
> Diagnosis/maintenance > Device state >Status classification−−FST: cancelation criteria met:
, [ ], , ,−−FST: start criteria not met:[ ], , , ,> Diagnosis/maintenance > Device state >Status messages−−FST: cancelation criteria met−−FST: start criteria not metÎÎ Recommended action when the test iscanceled (see Table 11)36

EB 8389-3 EN

TestsTable 11: Recommended action when the status message is generated

FST: cancelation criteria met

Test result

We recommend:

Current

ÎÎ Check input signal

Internal error

ÎÎ Restart test

Timeout
No movement possible

FST: start
criteria notmetÎÎ Check seat and plug for deposits or foreign particles

Start criteria

ÎÎ Check test configuration

Function activeÎÎ Wait for the active test to finish and restart test.

Incorrect operating modeÎÎ Set operating mode corresponding to Table 10 andrestart test.

'Reset diagnosis''Reset FST
configuration''Clear reports''Reset (standard)''Reset (advanced)'

RestartReset initialization

Table 12: Reset step response test

Reset configuration

NO

YES

NO

YES

YES

NO

YES

Clear reports

YES

YES

YES

YES

YES

NO

NO

Reset histograms

YES

YES

YES

YES

YES

NO

NO

Reset reference test

YES

YES

NO

YES

YES

NO

YES

Reset status messages

YES

YES

NO

YES

YES

NO

NO

EB 8389-3 EN37

Tests

6.3 Dead band
The difference in set point w that causes aminimal change in the valve position x is
termed ‘dead band’.
The valve dead band is affected by the friction hysteresis and the elastic processes inthe valve stem packing.
The test is started in the manual mode.
During the dead band test, the positioner
moves the valve in small steps through therange of 'Start set point' ±½ 'Span'. Afterevery step the positioner records the response of the valve position x.

The test starts at the 'Start set point' andends at position 1.
−− 'Start set point' – ½ 'Span' in 'Start direction' = 'Minus' or−− 'Start set point' + ½ 'Span' in 'Start direction' = 'Plus'
After the 'Delay time after set point change'elapses, the valve moves from position 1 toposition 2:−− 'Start set point' + ½ 'Span' in 'Start direction' = 'Minus' or−− 'Start set point' – ½ 'Span' in 'Start direction' = 'Plus'
After the 'Delay time after set point change'elapses, the positioner defines a further set
point change, which starts in position 2 andends at the 'Start set point'.

Fig. 12: > Diagnosis/maintenance > Tests > Dead band > ISA

38

EB 8389-3 EN

TestsAnalysis and monitoring

The 'Test status' generates an 'Active'
message.
'Function check'is activated as thecondensed state.

The dead band test provides statements on
the minimum, maximum and average deadband:

> TROVIS 3730-3−− 'Min. dead band': minimum change inset point that causes a minimal change
in the valve position.

1. −−Desired operating mode: MAN−− 'Max. dead band': maximum change inset point that causes a minimal change
in the valve position.

2. −−Start set point: 0.0 to 100.0 %, [50.0 %]> Diagnosis/maintenance > Tests > Deadband−−Start direction: Minus, [Plus]−− 'Average dead band': average change
in set point that causes a minimal change
in the valve position.
A plotted diagram is generated after the test
is successfully completed. Two different typesof diagrams are available:−− DIN: valve position [%] plotted against
the set point after filter [%]−− ISA: valve position [%] and the set point
after filter [%] plotted over time [s]Defining parameters
1. Switch to manual mode (Code 0 = MAN).

−−Span: 1 to 50 %, [1 %]−−Delay time after set point change:
0.2 to 25.0 s, [1.0 s]
3. −−Start test

Note
Cancel the test by right-clicking 'Stop test'
and selecting 'Execute' or by pressing the rotary pushbutton at the positioner. After thetest has been canceled, the positioner remains in manual mode.

Table 13: Resetting the dead band test

'Reset(advanced)'

RestartResetinitialization

Refer to Table 13'Reset(standard)'

3. Start test.

'Reset deadband test'

6.4 Reset'Resetdiagnosis'

2. Select test parameters.

Reset measured data and diagram

YES

YES

YES

YES

NO

NO

EB 8389-3 EN

39

Error messages and recommended corrective action

7 Error messages and recommended corrective action
Message

Recommended action

Status classification> Diagnosis/maintenance > Device state > Status classification
PST: cancelation criteria met

See section 6.1.

YES [

]

PST: start criteria not met

See section 6.1.

YES [

]

FST: cancelation criteria met

See section 6.2.

YES [

]

FST: start criteria not met

See section 6.2.

YES [

]

AMR signal outside range

ÎÎ Check attachment.

YES [

]

Hardware errorÎÎ Confirm error and select AUTO
operating mode.

YES [highest classification]

ÎÎ Re-initialize positioner.
Limit for total valve travel exceededÎÎ Check valve and attachment forsigns of wear.

YES [

]

Lower end position shifted

See section 5.2.

YES [

]

Upper end position shifted

See section 5.2.

YES [

]

Dynamic stress factor
exceededSee section 5.1.4.

YES [

]

ÎÎ Check attachment.

YES [

]

Set point deviation

ÎÎ Check air supply.
ÎÎ Check air lines/connections.
BrownoutÎÎ Check input signal.

YES [

]

Current too low

ÎÎ Check input signal.

YES [

]

IP shutdown

ÎÎ Check input signal.

YES [

]

Current too highÎÎ Check input signal.

YES [

]

Temperature inside device
below min. limit

ÎÎ Check operating conditions.

YES [

]

Temperature inside device
above max. limit

ÎÎ Check operating conditions.

YES [

]

Angle limitation

ÎÎ Check attachment.

YES [highest classification]

Logging suspended

The positioner is not impaired. The
message no longer appears as soon as
the positioner starts logging again.

YES [

40

]

EB 8389-3 ENError messages and recommended corrective action

Message

Recommended action

Status classification

Operating range in CLOSED
position

ÎÎ Check attachment.

YES [

]

Operating range in max.
OPEN position

ÎÎ Check attachment.

YES [

]

ÎÎ Check whether another valve canbe used.
ÎÎ Check whether another valve canbe used.

Operating range shifting
towards CLOSED position

ÎÎ Rethink the working range.

YES [

]

Operating range shifting
towards max. OPEN position

ÎÎ Rethink the working range.

YES [

]

Limited working range: lowerrange

ÎÎ Check that pneumatic installations
and connections are tight.

YES [

]

YES [

]

ÎÎ Check supply pressure.
ÎÎ Check plug stem for external
influences that could be blocking it.
Limited working range: upperrangeÎÎ Check that pneumatic installations
and connections are tight.
ÎÎ Check supply pressure.
ÎÎ Check plug stem for external
influences that could be blocking it.

EB 8389-3 EN

41

42

EB 8389-3 EN

EB 8389-3 EN

43

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

2019-02-06 · English

EB 8389-3 EN