Conversion Board for Thyristor Type Power
Adjusting Unit

UF-TB
INSTRUCTION MANUAL
Thank you very much for having purchased the “Conversion
Board UF-TB for Thyristor Type Power Adjusting Unit”.

The operators and other persons concerned are all requested to read this INSTRUCTION MANUAL thoroughly and to operate this conversion board as instructed therein so that it can fulfill its
functions perfectly. Keep this INSTRUCTION MANUAL carefully at any easily accessible place sothat it can be referred to at any time when required.

SAFETY PRECAUTIONSBefore installing, operating, maintaining, and inspecting this conversion board, be sure to read the present
INSTRUCTION MANUAL and all other documents attached therein carefully in order for you to operate thisconversion board properly. Before use, you are requested to master the know-how, safety instructions, and allother precautions on the equipment.
In this INSTRUCTION MANUAL, the following safety precautions are ranked as “DANGER” and “CAUTION” .

DANGERA procedure which, if not properly followed, may cause extremely hazardous
conditions, resulting in death or serious injury.

CAUTION

A procedure which, if not properly followed, may cause hazardous conditions,
resulting in medium or slight injury and/or only damage on physical assets.

CAUTION , may cause a serious result depending on the sitFurther, note that articles, even if noted in theuation. Strictly observe the articles since they describe important matters.

DANGER
Before attaching the conversion board, operators are required to turn off all the input power by a switch
on the distribution panel and to check to see that power is off. Otherwise, an electric shock or an injury
may be caused.

TABLE OF CONTENTS
PRECAUTIONS BEFORE USE･･･････････････････････････････････････････････････････････････■Confirmation of the product･････････････････････････････････････････････････････････････

HOW TO INSTALL CONVERSION BOARD
FUNCTION

2
2･････････････････････････････････････････････････････

2･･････････････････････････････････････････････････････････････････････････････

4■Changeover of feedback control method■Display function･･････････････････････････････････････････････････

4･･･････････････････････････････････････････････････････････････････････

4■Heater disconnection detection function

CONNECTION DIAGRAM････････････････････････････････････････････････

4･･････････････････････････････････････････････････････････････････

5■When UF-TB21A is to be used･････････････････････････････････････････････････････････････■When UF-TB33,or TB33U is to be used

5････････････････････････････････････････････････････

5････････････････････････････････････････････････････････････････

6

HEATER DISCONNECTION DETECTION FUNCTION ････････････････････････････････････････････

9

ADJUSTMENT PROCEDURE■Major features････････････････････････････････････････････････････････････････････････■Principles of operation

9････････････････････････････････････････････････････････････････

9■Setting procedure･････････････････････････････････････････････････････････････････････

10■Operating status･･･････････････････････････････････････････････････････････････････････

11

VARIOUS CHARACTERISTICS ･･････････････････････････････････････････････････････････････ 12■Constant current control･･････････････････････････････････････････････････････････････

12■Constant voltage control･･････････････････････････････････････････････････････････････

12■Constant power control････････････････････････････････････････････････････････････････

13■Heater disconnection detection

OTHERS

･････････････････････････････････････････････････････････

13････････････････････････････････････････････････････････････････････････････････

14■Troubleshooting■Dimensions･･･････････････････････････････････････････････････････････････････････

14･･･････････････････････････････････････････････････････････････････････････

14

1

PRECAUTIONS BEFORE USE
Confirmation of the product
Check if the following items are all provided.
No

Included items

Q’ty

1

Main body of conversion board 1 unit

2

INSTRUCTION MANUAL(the present document)

1 volume

3

Fixing screw

1 pce

4

CT or PT

1

2
INST
RU
CTIO
NM
AN
UA
L

3

4

Combination of CT and PT in a package
Model

CT

UF-TB21A

2 pce

UF-TB33, UF-TB33U

3 pce

PT
1 pce

HOW TO INSTALL CONVERSION BOARD
1 Remove the cover which is located on thefront of the unit.

2 Install the conversion board into the unit asshown in the figure on the right.

2

3 Connect the connectors “CN2” and “CN3”which are located on the conversion board to
the connectors “CN2” and “CN3” which arelocated at both sides of the printed circuitboard in the unit.

4 After connecting them, lightly push the area ofthe connectors “CN2” and “CN3” located on
the conversion board with the index finger. You
should hear it click at that moment.

5 Fix the printed circuit board located in the unit
and the conversion board, with an attachedscrew.

6 After checking to see that the conversion
board is properly installed, and that the screw
is fastened tightly, attach the cover.

3

FUNCTION
The control method differs from one type of conversion boards to another, so be careful when you actually use
them.
Model

Feedback control method

Display function
Voltage

Power

Heaterdisconnection
detectionfunction

Constant
current
control

Constant
voltagecontrol

Constant
power
controlWithout
control

Current

UF-TB21A

Available

N/A

N/A

N/A

Available N/A

UF-TB33

Available

Available

Available

Available

Available Available Available N/A

UF-TB33U

Available

Available

Available

Available

Available Available Available Available

N/A

N/A

Changeover of feedback control method(Available only for UF-TB33, and TB33U)
Changeover of the feedback control method is possible through the setting of the dip switch S6 on theconversion board.

1

2

ON
OFF

Feedback control method

12Without control

OFF

OFF

Constant current control

ON

OFF

Constant voltage control

OFF

ON

Constant power control

ON

ON

Display function
Use the Display Panel for Thyristor Type Power Adjusting Unit UF Series (UF-DP) together with thisconversion board to display output current, voltage, and power. Refer to the “INSTRUCTION MANUAL
for Display Panel for UF Series” for details.

Heater disconnection detection function
Able to detect a heater disconnection.
Refer to the “Heater Disconnection Detection Function” for details.

4

CONNECTION DIAGRAM
When UF-TB21A is to be used
Varies dependingon the setting system
V1 D1 I1 V2 D2 I2 V3 D3 I3Power
supply 㨪

RA
SA
TA
R
S
T

CT4

UF3
CN1

CN2

Display panel

0.1A

0.1A

k l
K 5AL

CT6 k lK 5A Lk 5A l

U
V
W
CN3

CT1 K

L
A

Load

k 5A lCT3 K

LAConversion
board

When UF-TB33, or TB33U is to be used

Varies dependingon the setting systemPT
V1 D1 I1 V2 D2 I2 V3 D3 I3

X YZN
3V

Y/Y

Power
supply 㨪

RA
SA
TA
R
S
T

v
U V WN

UF3
CN1

Display panel

CN2

U
V
W
CN3

0.1A
0.1A
0.1A
k l
k l
k l
CT6
CT4
CT5
K 5A L
K L
K L
CT1 K

L

5A

5A

k 5A lk 5A lA CT2 KL

k 5A lA CT3 K

Load

L
A

Conversion
board
CT1-3: main circuit CT
CT4-6: detect circuit CT

5

ADJUSTMENT PROCEDURE
Adjustment procedure differs from one type of conversion boards to another.
Model

Reference item

UF-TB21A

When the maximum load current and the rated current of main circuit
CT are the same
When the maximum load current is lower than the rated current of
main circuit CT
When the display panel (UF-DP) is provided

UF-TB33,
UF-TB33U

In the case ofwithout control orconstant voltage
control setting

When the maximum load voltage and the rated voltage of PT are thesame
When the maximum load voltage is lower than the rated voltage of PT
When the display panel (UF-DP) is provided

In the case of
constant current
control setting

When the maximum load current and the rated current of main circuit
CT are the same
When the maximum load current is lower than the rated current of
main circuit CT
When the display panel (UF-DP) is provided

In the case of
constant power
control setting

When the maximum load current and the rated current of main circuit
CT are the same, and when the maximum load voltage and the rated
voltage of PT are the same
When the maximum load current is lower than the rated current of
main circuit CT, or when the maximum load voltage is lower than the
rated voltage of PT
When the display panel (UF-DP) is provided

6

When the maximum load current and the rated current of main circuit CT are
the same
No adjustment is required.

When the maximum load current is lower than the rated current of main circuit CT
Adjust the “grade setting” so that the load current and the maximum load current are thesame when the input signal is set to the maximum.
If applying of the maximum load current is notpossible when adjusting, set the input signal
Vin1 so that an arbitrary load current will bewithin the value of the allowable current, andadjust the “grade setting” so that the load current and the load current value Iout1 at the
input signal Vin1 are the same.
However, in order that the load current will
stay within the allowable load current when
the power is turned on, the “grade setting”
should be set to the state of “0” beforehand,and adjust it by gradually increasing thevalue.

Loadcurrent

Rated current of unit

Maximum load
current
I out 2

I out 1

4
1
0

Vin1

Input signal

20mA
5V
5V

When the maximum load voltage and the rated voltage of PT are the same
No adjustment is required.

When the maximum load voltage is lower than the rated voltage of PT
Adjust the “grade setting” so that the load
voltage and the maximum load voltage are
the same when the input signal is set to the
maximum.
If applying of the maximum load voltage is notpossible when adjusting, set the input signal
Vin1 so that an arbitrary load voltage will bewithin the value of the allowable voltage, andadjust the “grade setting” so that the load
voltage and the load voltage value Vout1 at
the input signal Vin1 are the same.
However, in order that the load voltage will
stay within the allowable load voltage when
the power is turned on, the “grade setting”
should be set to the state of “0” beforehand,and adjust it by gradually increasing thevalue.

Loadvoltage

Rated voltage of unit

Maximum load
voltageV out 2

V out 1

4
1
0

7

Vin1

Input signal

20mA
5V
5V

When the maximum load current and the rated current of main circuit CT Are
the same, and when the maximum load voltage and the rated voltage of PT
are the same
No adjustment is required.

When the maximum load current is lower than the rated current of main circuit CT, or when the maximum load voltage is lower than the rated voltage ofPT
Adjust the “grade setting” so that the load
power and the maximum load power are thesame when the input signal is set to the maximum.
If applying of the maximum load power is notpossible when adjusting, set the input signal
Vin1 so that an arbitrary load power will bewithin the value of the allowable power, andadjust the “grade setting” so that the load
power and the load power value Wout1 at the
input signal Vin1 are the same.
However, in order that the load power will
stay within the allowable load power when the
power is turned on, the “grade setting” should
be set to the state of “0” beforehand, andadjust it by gradually increasing the value.

Rated power of unit

Load
power

Maximum loadpower
W out 2

W out 1

4
1
0

Vin1

Input signal

20mA
5V
5V

Precautions
To prevent any damage on the heaters, etc. when the “grade setting” was manipulated in a wrong way,
set the current limit amount using a display panel (UF-DP) higher than the load current used but lower
than the current value with which the heater can be protected.

8

HEATER DISCONNECTION DETECTION FUNCTION
Using of the conversion boards UF-TB33U allows any one of heaters to be detected for disconnection. For thewiring procedure, refer to the relevant sections regarding each model of conversion boards.

Major features
Can detect a disconnection of any one of heaters which are connected in parallel.
(Maximum allowable number of heaters to be connected in parallel is 8.)
Setting at the resistance value is possible from the pushbutton switch (S5) on the conversion
board.

S5

Arbitrary setting of a disconnection detecting amount is possible from the display panel (UF-DP) .
Disconnection of any one heater, when detected, lights the indicator lamp (HET) on the front of theunit. The display panel (UF-DP), if provided, lights the “HEAt” on the numerical value display.
Additionally, disconnection of any one heater, when detected, causes a minor failure relay to activate.
Disconnection of any one heater, even when detected, causes the unit to continue its output.

Principles of operation
Load current and load voltage are calculated with the main circuit, the detect circuit CT • PT, andthe conversion board.
Load current (%) and load voltage (%) at the beginning of operation are memorized.
The resistance value at the time of the load capacity setting of the heater is calculated from theload current and load voltage.
The resistance value during operation is calculated at necessity from the load current and load voltage.
When the amount of fluctuation in resistance value exceeds the disconnection detecting amountset beforehand, the warning of heater disconnection is outputted.
For the prevention of malfunction, if the load voltage is less than 10% of the rated voltage, disconnection is not to be detected.
For the prevention of detection in a wrong way, warning is not outputted for 5 minutes after starting
operation.

9

Setting procedure
After the connection of CT, PT, conversion boards, heaters, and the like is completed, start the operation of heaters in a normal way. After the temperature in the furnace has been kept constant after awhile, perform the following settings. Setting without the temperature kept constant can cause any error
in detection.
Setting of the resistance value of the heater
When the pushbutton switch S5 on the conversion board is held in the pushed state over about one
second, the indicator lamp (HET) on the front of the unit flickers, and calculate load resistance thanload electric current and the load voltage and memorize for resistance value of the heaters. When theswitch is released, the indicator lamp is turned off, and the setting of the resistance value of heaters iscompleted.
Setting the disconnection detecting amountThe initial value of disconnection detecting amount is set to 50%. If the value needs to be changed, it
can be set with the display panel (UF-DP). (It is set in a place where the indication at the left end is “U”
in the INPUT mode.)
When multiple heaters with the same resistance are in parallel operation, a disconnection of one heater
can be detected by setting the values as shown below.
But when, as for the following set point, a resistance value of a parallel heater is the same, and the balance of the power supply of each aspect is the same, besides. A resistance value of a parallel heater
has some errors, and some balance of the power supply of each aspect is really different, besides.
Therefore, in the following set point, the heater disconnection detection function may not detect heater
disconnection. With real load, please confirm it.
In the case of 3 arm units(UF3-0XXXF)
Number of heaters connected
In the case of
in parallelload

In the case of

1

(43%)

(50%)

2

23%

40%

3

16%

25%

4

12%

18%

5

10%

14%

6

8%

11%

7

---

10%

8

---

8%

load

In the case of 6 arm units(UF3-0XXXKF)
Number of heaters connected
In the case of
in parallelload

In the case of

1

(47%)

(50%)

2

24%

40%

3

17%

25%

4

12%

18%

5

10%

14%

6

8%

11%

7

---

10%

8

---

8%

10

load

Operating status
Indication of disconnection
Heater disconnection, when detected, starts the following indication procedure.
The indicator lamp (HET) lights up on the front door of the unit body.
The display panel (UF-DP), if provided, lights “HEAt” on the numerical value display.
The heater disconnection detection function is not self-held. Therefore, the indicator lamp isreturned to its original status when the detected value falls below the set value upon the detectionof heater disconnection.
Warning output
Heater disconnection, when detected, starts the following operation procedure.
nnn

A minor failure relay in the unit body activates, and the HA and HC on a terminal block become
closed.
The detection of heater disconnection is released when the detected value falls below the set value
after heater disconnection was detected, and the minor failure relay is returned to its original (open)
status.
When the output in the unit body comes to a standstill (for example, the ST and PH are opened) after
heater disconnection was detected, such detection is held with the minor failure relay stayed in its
closed status.
The heater disconnection detection function is not self-held. Therefore, a minor failure relay isreturned to its original (open) status when the control power supply is turned off upon the detectionof heater disconnection.
Under-voltage and abnormal frequency in addition to heater disconnection, when detected, willcause the minor failure relay to activate. So, check the indicator lamp for a cause of activating therelay.
However, in the event of under-voltage or abnormal frequency, the minor failure relay activatesafter such abnormalities have been detected continuously for about 2 seconds.

Output status
Heater disconnection, even when detected, causes the unit to continue its operation. So, be carefulwhen the unit is to be used under the constant current control and constant power control modes.
Leaving the unit in the operated status may increase the output voltage, and thereby cause an excessive load to be imposed on the heater.

11

VARIOUS CHARACTERISTICS
Constant current control (Phase control)
Specifications

Characteristics

Condition

Accuracy

Power supply voltage
fluctuation
at constant load
and at constant ambient
temperature±10%

Load fluctuation
at constant power supply
voltageand at constant ambient
temperature

1/10-1
fold

Ambient temperaturefluctuation
at constant power supply
voltageand at constant load

-10 to50°C

Signal current

Within±1% (F.S)

8mA12mA 16mA 20mA

100

Output 80
voltage(%)

Within±2% (F.S)

60
40
20
0

Within±2% (F.S)

20

40

60

80

100

Output current (%)

When use it by Cycle control, pray for an
inquiry to our business.

Constant voltage control (Phase control)
Specifications

Characteristics

Condition

Accuracy

Power supply voltage
fluctuation
at constant load
and at constant ambient
temperature±10%

Load fluctuation
at constant power supply
voltageand at constant ambient
temperature

1-10
fold

Ambient temperaturefluctuation
at constant power supply
voltageand at constant load

-10 to50°C

Signal current
20mA

Within±1% (F.S)

100

Within±1% (F.S)

Output 80
voltage(%) 60

12mA

40

8mA

16mA

20
0

Within±2% (F.S)

20

40

60

80

Output current (%)

When use it by Cycle control, pray for an
inquiry to our business.

12

100

Constant power control (Phase control)
The case of UF-TB33, or TB33U
Specifications
Condition
Power supply voltage
fluctuation
at constant load
and at constant ambient
temperature
Load fluctuation
at constant power supply
voltageand at constant ambient
temperature
Ambient temperaturefluctuation
at constant power supply
voltageand at constant load

Characteristics±10%

Accuracy
Within±1% (F.S)

100

Load resistancecurve

Output 80
voltage

Signal current

(%)
1-4
fold

Within±5% (F.S)

20mA
16mA
12mA

60
8mA

40
5mA

20
0

-10 to50°C

Within±3% (F.S)

20

40

60

80 100

Output current (%)

When use it by Cycle control, pray for an
inquiry to our business.

Heater disconnection detection
Item
Setting range for load capacity
Setting range for warning of
disconnection
Disconnection detection range
Detection accuracy for load
capacity

Warning output
Warning terminal

Contents of specifications
25% or more of the rated voltage, and 25% or more of the rated current
8 to 50%
Initially, it is set to 50%.
10% or more of the rated voltage
Within 10%, in the case of 10% or more of the rated voltage, and 10%
or more of the rated current ( )Within 5%, in the case of 50% or more of the rated voltage, and 50%
or more of the rated current ( )Relay contact 1a, AC250V1A or DC30V1A (at resistive load)
Between HA and HC on the terminal block in the unit

For conditions, secondary voltage of PT: 3.0V/100%, and secondary current of CT: 0.1A/100%

13

OTHERS
Troubleshooting
Situation

RemedyFully output control is
not functioning.

Are not detection lines opened?

Check the wiring.

Are polarities aligned in the case of constant
power control?

Check polarities.

THY abnormality occurs.

Are not detection lines of PT and CT disconnected?

Check the wiring.

Load abnormality occurs.

Are not detection lines of PT disconnected?

Check the wiring.

Output does notagree with its set value.

Are switches all right on the conversion
board?

Set the switches
properly.

In the case that the secondary voltage of PT
is other than 3V, or that the secondary current of CT is other than 0.1A, is adjustmentof VR completed on the conversion board?

Adjust VR.

Are CN2 and CN3 inserted properly on theconversion board?

Check CN2 andCN3.

Are both output voltage and current detected
25% or more of their rated values?

Increase outputs.

Setting of heater
disconnection detection
cannot be made properly.

Also, refer to “Troubleshooting” included in the INSTRUCTION MANUAL for the unit main body.

Dimensions
CT

65

85

57

37

70

50
4- 5x8PT
For 210V and 420V
123

103

40
4-Φ5.050
73

Unit: mm14

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SANSHA ELECTRIC MFG. (SHANGHAI) CO.,LTD(China)Room310,555 Building,555West Nanjing Road,
Shanghai 200041,P.R.China
Tel: +86-21-5868-1058 Fax: +86-21-5868-1056

SANREX LIMITED (Hong Kong)
Room 307,Kowloon Plaza,485 Castle Peak Rd.,
Kowloon,HongKong
Tel: +852-2744-1310,+852-2785-6313
Fax: +852-2785-6009

The specifications of this product described in this INSTRUCTION MANUAL may, incident
to any improvement in the product, be subject any change without prior notice.

K00A0062900

2010.10.20