Chino JU Series User manual

Thank you for your purchase of JU series thyristor regulator. Please read this instruction manual
carefully to use the unit correctly and safely and also prevent troubles in advance.
Check your model To our sales agent and
instrumentation contractor To user
Check your model and its
specifications. Deliver this instruction manual
to your final user. Keep this instruction manual until
you throw the unit into the discard.
Contents
1
1. Model code 2
2. Names of component parts 3
3. Installation 5
4. External dimensions 6
5. Settings 7
6. Connections 12
7. Operation 19
8. Alarm and error indications 20
9. Troubleshooting 21
10. Maintenance 22
11. Accessories 24
12. General specifications 26
INST.No. INE-316E
Cautions on safety

INSTRUCTION MANUAL
FOR
JU SERIES
SINGLE-PHASE
THYRISTOR REGULATOR

－1－
Cautions on safety
1. Preconditions for use
The unit is to be installed inside an indoor instrumentation panel.
2. Symbol marks employed in the unit
Use in the unit
Labels Meanings
Caution on handling for
prevention of an electrical shock,
injuries or other accidents
Caution on a hot place (heat
sink) for preventing burn
Caution on a rotating place
(cooling fan) for preventing
injuries
Connect the grounding part
(mounting hole) to the protective
conductor terminal of the power
supply equipment.
Use in this manual
Labels Meanings
The nonobservance of
information under this symbol
may result in death, or
hazardous, critical or serious
injury.
The nonobservance of
information under this symbol
may result in a hazardous
situation or a light injury or in
physical damage to a
property.
Information that you can use
as a reference
3. Summary
This JU series single-phase thyristor regulator is the power regulator for controlling of power to a
heater of electric furnaces or other equipment, depending on the signal from a controller or a manual
setting unit. This unit is designed as a general-purpose product for general industrial products. It is not
intended for use in human-life and property related applications such as nuclear and radiation related
equipment, medical equipment, aerospace equipment, railroad, and marine transportation equipment.
To use this unit for equipment that requires high quality and safety that affects human-life and property,
design and install the protection and safety circuits to ensure safety at your own responsibility.
Warnings/Cautions
1. Installation direction
Make sure to install the unit vertically with its UP
mark ( UP) placed upward to ensure air-cooling
effect.
2. Don’t use the unit on any desk.
Make sure to install the unit on a panel to prevent
its trouble or an injury by its falling down.
3. Installation environment
Don’t operate the unit at a place where an
explosive gas, an inflammable gas, vapor, or
conductive substances like carbon, iron powder,
etc. exist.
4. Don’t repair or modify the unit
To prevent an electrical shock accident, a fire, or
its trouble, don’t repair, modify, or disassemble the
unit by any person other than our qualified
servicemen.
5. Turn off the power supply for an abnormal
symptom.
If you have abnormal odor, abnormal heating, or
other abnormal symptoms, turn off the power and
inform of it to your nearest agent of CHINO
Corporation.
6. Heavy product
When working on a product more than 18kg, do
not work alone.
Request for securing safety
1. Use the unit at the rated current or lower.
Confirm the rated current on the label pasted on
the upper panel or front panel of the unit.
2. Connect a load before turning on the power
supply
Never turn on the power supply without
connecting a load in advance to prevent its
trouble.
3. Applicable load
A resistive load is applicable. An inductive load
(transformer primary control, magnetic flux density
1.2T or less) is applicable only when the
phase-angle firing system is selected.
4. Mounting of a rapid fuse
For the models without a rapid fuse, mount a rapid
fuse externally for protecting the thyristor element.
5. Countermeasure against digital units
Higher harmonic noises are generated when the
unit is used with the phase-angle firing system.
Use an insulation transformer, separate the unit
from a power line, or take other countermeasures.
6. Don’t use any unused terminals.
Don’t connect any signal to any unused terminals
to prevent a trouble.
Reference
A
lert
symbol
mark
Caution
on high
temperature
C
aution on
moving
p
arts
Grounding
terminal
Warning
Caution

－2－
1. Model code
1. Labels for Model and Specifications
The model and the rated voltage/current of the unit are indicated in the labels pasted on upper panel or front
panel. Your checking the specifications of the unit is requested before using.
2. Model
1 2 3 4 5 6 7 8 9 10 11 12
J U

Power voltage 
10:100V 11:110V 12:120V 20:200V 22:220V
24:240V 38:380V 40:400V 44:440V 99:Others
Rated current
010:10A 020:20A 030:30A 050:50A 075:75A
100:100A 150:150A 200:200A 250:250A 300:300A
400:400A 500:500A 750:750A X00:1000A
Control type and feedback system
V: Phase-angle firing system with voltage feedback/zero-cross
firing system *1
A: Phase-angle firing system with current feedback/zero-cross
firing system *1
W: Phase-angle firing system with power feedback/zero-cross
firing system *1
N: Phase-angle firing system without feedback/zero-cross firing
system *1
C: Zero-cross firing system
Rapid fuse
A: Provided N: Not provided
Setting communications unit *4
0: Not provided
1: Provided (for installing on the unit)
2: Provided (for installing on a panel) *2
3: Provided (with communications, for installing on the unit)
4: Provided (with communications, for installing on a panel) *2
CT (current transformer) *4
0: External installation (prepare a CT as needed)
1: Built-in (Rated current 10 to 75A only)
Other functions
0: Not provided
1: With heater disconnection alarm *1, *4
2: Current limit function *3, *4
3: Heater disconnection alarm + current limit function
(only with the setting communications unit) *4
Label Bar code
Model code
Serial No.
Rated voltage/rated current
*1: For the unit with the heater
disconnection alarm (without
the setting unit), the selection
of the phase-angle firing
system and the zero-cross
firing system is not available.
*2: For installing to a panel, an
exclusive cable SH-JUK3 (3m)
or SH-JUK5 (5m) is required.
*3: For the unit with the current
limit function, the combination
with the zero-cross firing
system is not available.
*4: For the unit without feedback, setting
communications unit, heater
disconnection alarm, and current limit
function are not available.

－3－
2. Names of component parts
10A, 20A 30A to 75A
*1 For the unit with the optional heater disconnection alarm (without the setting communications unit), the initial
resistance value is set between the control input terminals (6) and (7).
Names Functions
(1) EV1 lamp
This lamp lights when the operation of the unit is normal or flickers when it is
abnormal. If this lamp flickers, stop running the unit at once and contact your nearest
agent of CHINO corporation.
(2) EV2 lamp Lights when an over-current is detected.
Flickers when heater disconnection is detected.
(3) EV3 lamp
Lights when fuse disconnection is detected. (excluding 10A and 20A, only fuse built-in
model)
Flickers when an abnormal of the thyristor element is detected.
(4) EV4 lamp Lights when the temperature of the heat sink is abnormal. (excluding 10A to 150A)
Flickers when a parameter is stored into memory.
(5) SET1 trimmer Is used for the settings of ramp and high limit.
For details, refer to [5. Settings].
(6) SET2 trimmer Is used for the setting of soft start time. For details, refer to [5. Settings].
(7) SET3 trimmer Is used for the settings of elevation and low limit, or optional specifications. For details,
refer to [5. Settings].
(8) Setting terminals These terminals are for input signal and various kinds of setting units. For details, refer
to the above figure or [6. Connections].
(9) Fuse When this over-current protective fuse is blown out, replace it with a new one. Refer to
[10. Maintenance].
(10) Ground terminal Make sure to connect this terminal to the protective conductor terminal.
(11) Main circuit terminals Main circuit terminals (U1 and U2)
* The above contents may be changed according to the specifications.
(8) Setting terminals
(6) SET2 trimmer
(7) SET3 trimmer
(11) Main circuit
terminals
(9)Fuse
Mounting hole (2-M6)
(10) Ground
terminal
(1) EV1 (2) EV2 (3) EV3 (4) EV4
(5) SET1 trimmer
(1) (2) (3) (4)
(6)
(7)
(8)
(9)
(10)
(11)
(5)
Mounting hole
(2-M8)
12
1
3
14
1
5
1
6
1
7
1
8
1
9
20
21
22
IN1
IN2
M1
M3
DI1
DI2
DI COM
1
2
3
4
5
6
7
8
9
10
11
A
LARM2 Alarm c
o
ntact2
Not used
Not used
Various setting input
K
L
Not used
V
A
larm contac
t
1
A
LARM1
mA
V
Various setting
input (M2)
Control input
External
CT input
Setting terminals
Phas
e
-
angle/Zer
o
-
cross switching *1
Run/stop switching
Not used

－4－
2. Names of component parts
100A to 250A 300A to 500A
Mounting hole (2-M8)
(9)
(11)
(5) (7)
(6)
(8)
(1)
(2)
(3)
(4)
(10)
(5) (7)
(6)
(8)
Mounting hole (2-M8)
(11)
(10)
(9)
(1)
(2)
(3)
(4)

－5－
3. Installation
Make sure to
t
urn off the power supply source before installation to prevent an electrical
shock accident. The unit is designed as a back-of-panel type to be installed inside a
panel, except accessories (setting units, etc.).
3.1 Cautions on installation
(1) Install the unit with the UP mark ( UP) facing upward.
(2) Install the unit at a clean and well-ventilated place free of dust particles.
(3) Separate the unit from a high temperature generating unit or similar units.
(4) Keep a radiation space (space of the unit) above and below the unit.
(5) Don’t install the unit at a place subjected to vibrations and shocks.
(6) Don’t place the unit in a corrosive gas atmosphere.
(7) Sufficient strength is required for the installation panel.
(8) The rated current is specified at the reference ambient temperature of
50oC. If the ambient temperature exceeds 50oC, reduce the load current,
referring to the right figure.
(The maximum working temperature is 55oC. Use the unit at 90% of the rated current or lower in this case.)
Refer to external views and
mounting diagrams in [11.
Accessories].
Rated current and heat generated/weight
Rated
current
Heat
generated Weight Rated current
Heat
generated Weight
10A 9W Approx.2kg 150A 125W Approx.6kg
20A 22W Approx.2kg 200A 200W Approx.7kg
30A 34W Approx.3kg 250A 235W Approx.7kg
50A 44W Approx.3kg 300A 280W Approx.12kg
75A 64W Approx.3kg 400A 390W Approx.12kg
100A 96W Approx.6kg 500A 505W Approx.12kg
* The weight may differ according to the specifications.
3.2 Installation dimensions
For the external dimensions, refer to [4. External dimensions].
In case of 10A and 20A In case of 30A, 50A and 75A In case of 100A, 150A, 200A and 250A
In case of 300A, 400A and 500A Setting communications unit (for panel
mounting only)
Mounting
of accessories
Reference
95*
70 70
2-M6
150 140
+1
0
150
140
+1
0
170
Unit : mm
*Minimum space when
units are arranged
horizontally.
(In case of
horizontal installation)
Ambient temperature and
allowable current
Warning
2-M8 85*
60
32
5
300
+
2
0
Unit : mm 2-M8 153*
128
32
5
300
+
2
0
Unit : mm
2-M8 153*
128
49
5
470
+
2
0
Unit : mm 4
7
2-φ3.
5
91
9
8
Unit : mm
20
-10 102030405055
40
60
80
90
100
Rated current
(
%
)
Temperature (℃)

－6－
4. External dimensions
In case of 10A and 20A In case of 30A, 50A and 75A
In case of 100A, 150A, 200A and 250A In case of 300A, 400A and 500A
Setting communications unit (option)
12
5
140
150
16
5
7
7
0
Main circuit terminal
s
: M
4
140
Setting terminal
s
:M
3
A
larm displa
y
6
0
270
300
32
5
2
5
1
3
3
0
12
3
0
270
2
5
300
32
5
12
7
0
128 φ10.5
117
190
U1 U
2
190
1
0
2
6
3
4
1
0
128
3
0
440
2
5
12
470
13
49
5
144
5
0
230
2
5
6
5
*
φ12.5
U1 U
2
2-φ3.
5
1
0
4
9
8
5
0
12
3.
5
Unit : mm
* 16.
5
φ
(500A onl
y
)
U1 U
2
U1
U
2
1
3
Alarm
display
Setting
terminals: M3
Main circuit
terminals
: M5
Setting
terminals:M3
A
larm displa
y
Main circuit
terminals:M10
Unit : mm
Setting
t
e
rminal
s
: M
3
Alarm
display
Main circuit
terminals:
M12, M16
Unit : mm
Unit : mm
P
rotective conductor
terminal: M4
P
rotective conductor
terminal: M4
P
rotec
t
ive
conductor
terminal: M4
Unit : mm
P
rotective conductor
terminal
:
M
4

－7－
5. Settings
For various settings, change the settings gradually to avoid affection to a load and
peripheral units by an abrupt change of output.
5.1 Common settings to current/voltage input signal and contact
input signal
(1) Control system selection
Setting terminals (6) and (7) Open: Phase-angle firing system Short: Zero-cross firing system
*For the unit with the optional heater disconnection alarm (without the setting communications unit), the
selection of the phase-angle firing system and the zero-cross firing system is not available.
(2) Soft start time setting (SET2 trimmer)
Soft start time becomes about 1 second when turning this trimmer fully counterclockwise, and becomes 20
seconds when turning it fully clockwise.
(3) Run/stop selection (5) and (7)
Run can be stopped by short-circuiting setting terminals (5) and (7).
5.2 Settings of current/voltage
input signal only
(1) Ramp setting (SET1 trimmer)
Ramp becomes 0% when turning this trimmer fully
counterclockwise and becomes 100% when turning it fully
clockwise.
Set this trimmer to 100% when the ramp is set by an
external setting unit.
(2) Elevation setting (SET3 trimmer)
Elevation becomes 0% when turning this trimmer fully
counterclockwise and becomes 100% when turning it fully
clockwise.
Set this trimmer to 0% when the elevation is set by an
external setting unit.
* For the unit with an optional heater disconnection
alarm (without the setting communications unit) or an
optional current limit function (without the setting unit),
this setting is not available. Install an external elevation
setting unit or the setting unit additionally.
5.3 Settings of contact input signal
only
(1) High limit setting (SET1 trimmer)
High limit becomes 0% when turning this trimmer fully
counterclockwise and becomes 100% when turning it fully
clockwise.
Be careful the followings.
Actual high limit value % = high limit set value % + low
limit set value %
(2) Low limit setting (SET3 trimmer)
Low limit becomes 0% when turning this trimmer fully
counterclockwise and becomes 100% when turning it fully
clockwise.
* For the unit with an optional heater disconnection
alarm (without the setting communications unit) or an
optional current limit function (without the setting
communications unit), this setting is not available.
Install an external low limit setting unit or the setting
communications unit additionally.
For 10A, 20A, 30A, 50A, 75A
For 100A or more current
SET1 trimmer : 100%
SET2 trimmer : 1sec
SET3 trimmer : 0%
Default values of trimmers
Caution
0%
100%
SET1 trimmer
(5)
(6)
(7)
20 sec
1 sec
SET2 trimmer
0%
100%
SET3 trimmer
(5) (6) (7)
0%
100%
SET1 trimmer
20 sec 1 sec
SET2 trimmer
0%100%
SET3 trimmer
The unit without the setting
communications and with the
current limit function is 100%.

－8－
5. Settings
5.4 Heater disconnection alarm
(option, without the setting communications unit)
(1) Heater disconnection alarm
When the heater resistance value becomes higher than the value being set by the disconnection-ratio setting,
EV2 flickers and alarm contact (a contact) is activated to ALARM2.
Disconnection ratio = [(Resistance value of which disconnection is to be detected
- initial resistance value)/Initial resistance value] x 100(%)
Disconnection-ratio setting range is 10% to 100%
* Not applicable to silicon carbide (Sic) heaters
* The CT is to be mounted externally. (except the CT built-in type) (External CT is not necessary in case of
mounting the CT for feedback.)
* This function is not available to the unit without feedback.
* For the unit with the setting communications unit, refer to the separate instruction manual for the setting com-
munications unit.
* Range of settable initial resistance value is (rated voltage of thyristor / rated current) x 1/10(Ω) to (rated voltage
of thyristor / rated current) x 5(Ω).
* The judgement criteria for the heater disconnection alarm are control input value 10% or more and feedback
value 10% or more.
(2) Settings of heater disconnection alarm
1. Apply an input signal to the unit (thyristor regulator) and continue feeding the power until the load current
value is stabilized.
2. After the load current has been stabilized, store the initial resistance value into memory by short-circuiting the
control input terminals (6) and (7) for about 1 second. EV4 flickers. If EV4 is not flickering, it means that the
initial resistance value is not stored. Perform initial resistance value storing operation once again.
3. Open the control input terminals (6) and (7).
4. Set the disconnection ratio by SET3 trimmer. This ratio becomes 10% when turning this trimmer fully
counterclockwise and becomes 100% when turning it fully clockwise.
The settings complete.
5.5 Current limit function
(option, without the setting communications unit)
(1) Current limit function
In case of the voltage feedback, for example, a current flows according to the load resistance value and it may
exceed the rated current of the thyristor if the voltage is only controlled. This current limit function is for
prevention of this current overflow. The example shows the current limit function for the voltage feedback.
(2) Settings of current limit value (SET3 trimmer)
Set the current limit value by SET3 trimmer. This current limit value becomes 0% when turning this trimmer
fully counterclockwise and becomes 100% when turning it fully clockwise.
* The CT is to be mounted externally. (except the CT built-in type) (External CT is not necessary in case of mounting
the CT for feedback.)
* This function is not available to the unit without feedback.
* For the unit with the setting communications unit, refer to the separate instruction manual for the setting communi-
cations unit.
0
20
40
60
80
100
20 40 60 80 100
Output current (%)
Input
(
%
)
70 Current limit value 70%

－9－
5. Settings
5.6 References
5.6.1 Control system
(a) Phase-angle firing system
The output is controlled by changing the conduction angle θ(ON timing) in the half cycle (180o) of the power
supply. The control becomes continuous as compared with the zero-cross firing system. This control system
can be used for transformer primary control, too. However, since the output contains higher harmonics, it may
cause external noises.
(b) Zero-cross firing system
This system controls the output by deciding ON/OFF every cycle of the power supply. Since the power supply
is turned on from 0 volt (zero cross point), noises are reduced as compared with the phase-angle firing system.
However, the maximum current flows intermittently during ON cycle to cause flickering or the like.
* Nickel-chrome heater is only intended for the use. Using heater except transformer load or nickel-chrome is
cause of over current or fuse meltdown.
5.6.2 Relation of heater types and feedback
(a) Phase-angle firing system
with voltage feedback/without feedback
In case of a heater having a small temperature coefficient of
electric resistance like Nickel-chrome heaters, the output power is
kept almost constant when the output voltage of the thyristor
regulator is kept constant. The voltage feedback type thyristor
regulator detects the voltage being applied to the load and feeds
it back to be able to obtain a stable output having high linearity.
(b) Phase-angle firing system with current feedback
In case of a heater, of which electric resistance is low at low
temperature and changes to 6 to 12 times at normal temperature,
like Molybdenum disilicide heaters, the output current changes
with temperature even if the output voltage is kept constant, and
a large current flows at low temperature. Since the current
feedback type thyristor regulator detects the current being flow to
the load and feeds it back, a current proportional to the input
signal is output to be able to obtain very stable control, irrespec-
tive of the resistance value change of the heater, when the
maximum output of thyristor is set to the maximum rated current
value of the heater.
(c) Phase-angle firing system with power feedback type
In case of a heater, of which electric resistance value changes
according to the heating temperature and the resistance value
deteriorates down to about 4 times the initial value due to a
secular change, like Silicon carbide (SiC) heaters, the output
power changes with temperature and also changes due to a
secular change even if the output voltage is kept constant. Since
the power feedback type thyristor regulator detects the voltage
and current to the load and feeds them back after multiplying
them, the power proportional to the input signal is output,
irrespective of a resistance value change of the heater, and a
change due to deterioration of the heater is also corrected
automatically.
Resistanc
e
Temperature
Nickel-chrome heater
Molybdenum disilicate
heater
Temperature
Resistanc
e
Silicon carbide (SiC)
heater
Deterioration
Temperature
Resistanc
e

－10－
5. Settings
5.6.3 Ramp setting (current/voltage input only)
Ramp can be set by the built-in
trimmer or connecting a 10kΩvaria-
ble resistor to the setting input ter-
minals. This is effective for a 3-zone
electric furnace, etc. where three
thyristor regulators are controlled
with one controller.
5.6.4 Elevation setting (current/voltage input only)
Elevation can be done by the built-in
trimmer or connecting a 10kΩvaria-
ble resistor to the setting input ter-
minals. A constant base power can
be applied to an electric furnace, etc.,
even if the output from a controller is
minimized.
5.6.5 High limit/low limit settings (Contact input only)
High limit and low limit can be set by
the built-in trimmers or connecting
10kΩvariable resistors to the control
input terminals. When these limits
are set by the built-in trimmers only,
be careful the followings.
Actual high limit value (%) = high
limit set value (%) + low limit set
value (%).
5.6.6 Soft start
This function is provided to increase the output gradually up to the specified output when the power supply is
turned on or when the control input value changes abruptly. This function can prevent a surge current from being
generated due to an abrupt change of the primary control output of transformer. The time (from 0% to 100%
output) can be set from about 1 second to 20 seconds.
0
20
40
60
80
100
Outpu
t
(%)
20 40 60 80 100
Control in
p
u
t
(
%
)
20
40
60
80
100
Ramp set value (%)
* This graph shows an image and is different from actual one.
20406080 0
Elevation value (%)
* This graph shows an image and is different from actual one.
0
20
40
60
80
100
High limit
setting 70%
0
20
40
60
80
100 High limit setting
70
%
* This graph shows an image and i
s
different from actual one.
In case o
f
high limit set value 70%
+ low limit set value 0%
In case o
f
high limit set value 70%
+ low limit set value 20%
A
ctual high limit value % = High limit set value (%) + low limit set value (%).
0
20
40
60
80
100
Outpu
t
(%)
20 40 60 80 100
Control in
p
u
t
(
%
)
Low limit
setting 0%
Low limit
setting
20%
Outpu
t
(%)

－11－
5. Settings
5.6.7 Effective value type measuring instrument
In case of phase control, output waveform of thyristor is strained. Rectifier type meter will not get a true measure
of output because the meter is marked with scale based on the premise of sine wave. When measuring output
of thyristor, use a effective value type or moving-iron type of instrument.
Measurement type Voltage(V)
Effective value 0 30 60 90 120
Rectifier 0 12 28 50 76
Effective value 150 180 190 200
Rectifier 107 147 166 200
5.6.8 Surge countermeasure
When noise such as surge is generated at the time of opening and closing the breaker magnet. JU will be
affected by noise. Connecting a capacitor for noise absorption (oil capacitor/film capacitor) in order to absorb
surge voltage and noise in input side is recommended.
Example of voltage measurement of effective value type and rectifier type
JU
0.1 to 0.49μF
Withstanding pressure
1600 to 2000V

－12－
6. Connections
6.1 Preparation for connections
Be careful that the locations of the setting terminals and main circuit terminals differ depended on models.
10･20A 30 to 75A
100 to 500A
U1 U2
Main circuit terminals
U1 U2
Setting
terminals
12
1
3
14
1
5
1
6
1
7
1
8
1
9
20
21
22
1
2
3
4
5
6
7
8
9
10
11
12 1
3
14 1
5
1
6
1
7
1
8
1
9
20 21 22
1 2
3
4
5
6
7
8
9
10 11
Setting terminals
Main circuit
terminals
U1 U2
For 100A to 250A,
connect to the main
circuit terminals by
lifting the cover.
Connect to the setting
terminals by lowering the
cover.
Caution: Fasten the cover screws securely after connections.
U1 U2
Loosen
these screws
For 300A to 1000A,
connect to the main
circuit terminals without
shifting the cover.
Main circuit terminals
Main circuit
terminals
Setting
terminals
12
1
3
14
1
5
1
6
1
7
1
8
1
9
20
21
22
1
2
3
4
5
6
7
8
9
10
11

－13－
6. Connections
(1) Turn off the power source before connections to prevent an electric shock accident.
(2) Perform connections by experienced persons having the basic knowledge of wiring.
6.2 Cautions on connections
For connecting to the main circuit, use a cable having a sufficient allowance to the load current.
For connecting to other terminals, twist a 0.3 to 0.75mm2cable.
Use twist pair shielded wire for eliminating influence of noise.
(1) Check the size of each screw/ bolt and tighten it with a force within ±10% of the specified
fastening torque.
Screw fastening torque
M3 M4 M5 M6 M8 M10 M12 M16
0.5 N ・ m 1.2 N ・ m 3 N ・ m 5 N ・ m 12 N ・ m 25 N ・ m 40 N ・ m 100 N ・ m
(2) When installing the current transformer externally, do not use the secondary side of the
current transformer while opening.
Caution
Caution

－14－
6. Connections
6.3 Main circuit terminals/power terminals (U1, U2/V)
(1) For the CT built-in for a rated current of 10A to 75A, Without feedback
(2) For the CT mounted externally (except the unit without feedback)
* Current transformer is absolutely necessary for the unit with current or power feedback.
For the unit with voltage feedback, current transformer is necessary for over-current alarm, heater disconnec-
tion alarm, and current limit function.
For the setting communication unit, the current transformer is necessary for displaying current, power, load
resistance value.
Load
Rapid fuse
Required if it is mounted
externally
*In the case of
fuse meltdown,
the power to th
e
thyristor will be
cut off.
Thyristor regulator JU
Ground terminal
U1 U2
V
22
12 13 21
14 15 16 17 18 19 20
10 11 1 6
2 3 4 5 9
7 8
* Curren
t
transforme
r
K
L
K
L
CT secondary output 5A
Do not connect
ground to
secondary side
of CT.
Load
Rapid fuse
Required if it is mounted externally
*In the case of fuse
meltdown, the power
to the thyristor will be
cut off.
Thyristor regulator JU
Ground terminal
U1 U2
V
2213 21 14 15 16 18 19 20
10 11 1 6
2 3 4 5 9
7 8
12 17

－15－
6. Connections
6.4 Setting input signals
There are shorting chips between 12 to 13 and 15 to 16 before shipment.
Take out the shorting chips as necessary.
6.4.1 Current/voltage input signals
1) Current/voltage input signals only
Current signal (4 to 20mA DC) Voltage signal (1 to 5V DC)
2) Manual setting unit and auto/manual selector switch
Current signal (4 to 20mA DC) Voltage signal (1 to 5V DC) Manual setting unit only
3) Ramp setting unit
Current signal (4 to 20mA DC) Voltage signal (1 to 5V DC)
1
6
1
5
14
1
3
12
3
4
Controller
4 to 20mA DC
Short-circuit 1
6
1
5
14
1
3
12
3
4
1 to 5V DC
Short-circuit
Controller
1
2
3
1
6
1
5
14
1
3
12
3
4
A
UT.
MAN.
VL-JAL(10kΩ)
1
2
3
1
6
1
5
14
1
3
12
3
4
VL-JAL(10kΩ)
Manual
setting unit
1
2
3
1
6
1
5
14
1
3
12
3
4
A
UT.
MAN.
VL-JAL(10kΩ)
Controller
Manual setting unit
4 to 20mA DC 1 to 5V DC
Controller
Manual setting unit
3
2
1
1
6
1
5
14
1
3
12
3
4
VL-JAL(10kΩ)
1 to 5V DC
Controller
3
2
1
1
6
1
5
14
1
3
12
3
4
VL-JAL(10kΩ)
Ramp setting unit
4 to 20mA DC
Ramp setting unit

－16－
6. Connections
4) Elevation setting unit
Current signal (4 to 20mA DC) Voltage signal (1 to 5V DC)
5) Manual setting unit and ramp setting unit
Current signal (4 to 20mA DC) Voltage signal (1 to 5V DC)
6) With output indicator * Not applicable to the zero-cross firing system
Current signal (4 to 20mA DC) Voltage signal (1 to 5V DC)
3
2
1
Ramp setting unit
1
6
1
5
14
1
3
12
3
4
C
o
ntroller
A
UT.
MAN.
VL-JAL(10kΩ)
1
2
3
Manual setting unit
VL-JAL(10kΩ)
3
2
1
Ramp setting unit
1
6
1
5
14
1
3
12
3
4
C
o
ntroller
1 to 5V DC
A
UT.
MAN.
VL-JAL(10kΩ)
1
2
3
Manual setting unit
VL-JAL(10kΩ)
1
6
1
5
14
1
3
12
3
4
Controller
4 to 20mA DC
22
3
2
1
A
UT.
MAN.
1
2
3
U2
Ramp setting
(10kΩ)
7
4
2
1
V1
U2
Output
indicator
Setting unit with output indicator (VL-JAM)
16
1
5
14
1
3
12
3
4
Controller
1 to 5V DC
22
3
2
1
A
UT.
MAN.
1
2
3
U2
Ramp setting
(10kΩ)
Manual
setting
(2kΩ)
7
4
2
1
V1
U2
Output
indicator
Setting unit with output indicator (VL-JAM)
4 to 20mA DC
Manual
setting
(2kΩ)
1
2
3
Elevation
4 to 20mA DC
VL-JAL(10kΩ)
1
2
3
1 to 5V DC
VL-JAL(10kΩ)
Controller
1
6
1
5
14
1
3
12
3
4
2
1
6
1
5
14
1
3
12
3
4
2
Elevation
Controller

－17－
6. Connections
7) Ramp setting unit, elevation setting unit and auto/manual selector switch
Current signal (4 to 20mA DC) Voltage signal (1 to 5V DC)
8) Multiple units
Current signal (4 to 20mA DC) Voltage signal (1 to 5V DC)
9) Multiple units with ramp setting unit
Current signal (4 to 20mA DC)
4 to 20mA DC
Ramp setting unit
VL-JAL
(
10kΩ
)
1
6
1
5
14
1
3
12
3
4
3
2
1
4 to 20mA DC
1
2
3
VL-JAL(10kΩ)
VL-JAL(10kΩ)
Elevation setting unit
VL-JAL(10kΩ)
1
6
1
5
14
1
3
12
3
4
2
A
UT.
MAN.
A
UT.
MAN.
1 to 5V DC
A
UT.
MAN.
A
UT.
MAN.
1
2
3
1
2
3
Controller
Manual setting unit
Ramp setting unit
1
6
1
5
14
1
3
12
3
4
2
Controller
1
2
3
VL-JAL(10kΩ)
Manual setting unit
1
2
3
Ramp setting unit
VL-JAL(10kΩ)
1
2
3
Elevation setting unit
VL-JAL(10kΩ)
4 to 20mA DC
1
6
1
5
14
1
3
12
3
4
Controller
1
6
1
5
14
1
3
12
3
4
1
6
1
5
14
1
3
12
3
4
Shor
t
-circuit
Shor
t
-circuit
Shor
t
-circui
t
1 to 5V DC
1
6
1
5
14
1
3
12
3
4
1
6
1
5
14
1
3
12
3
4
1
6
1
5
14
1
3
12
3
4
Shor
t
-circuit
Shor
t
-circuit
Shor
t
-circuit
Controller
Controller
Ramp setting unit
VL-JAL
(
10kΩ
)
Ramp setting unit
VL-JAL
(
10kΩ
)
3
2
1
3
2
1
1
6
1
5
14
1
3
12
3
4
1
6
1
5
14
1
3
12
3
4

－18－
6. Connections
Voltage signal (1 to 5V DC)
6.4.2 Contact input signal
Connection of high limit setting unit Connection of high limit setting unit and low limit setting unit
Using setting trimmers of this unit only
Low limit setting …
Use the low limit setting trimmer of this unit.
High limit setting …
Use the high limit setting trimmer of this unit.
* For the settings of the trimmers, refer to 5.3
Settings of contact input signal only.
6.4.3 Operation switch and alarm
Operation/Stop switch Phase/Frequency dividing switch Alarm connection diagram
Refer to 8.1 for detail.
High limit setting unit connection
VL-JAL(10kΩ)
C
H
L
1 to 5V DC
Controller
Ramp setting unit
VL-JAL
(
10kΩ
)
Ramp setting unit
VL-JAL
(
10kΩ
)
Ramp setting unit
VL-JAL
(
10kΩ
)
3
2
1
3
2
1
3
2
1
1
6
1
5
14
1
3
12
3
4
1
6
1
5
14
1
3
12
3
4
1
6
1
5
14
1
3
12
3
4
3
2
1
1
6
1
5
14
1
3
12
3
4
1
2
3
1
2
3
C
H
L
1
6
1
5
14
1
3
12
3
4
High limit setting
unit connection
VL-JAL
(
10kΩ
)
Low limit setting
unit connection
VL-JAL
(
10kΩ
)
C
H
L 1
6
1
5
14
1
3
12
3
4
8
9
ALARM2
1
9
2
0
ALARM1
5
7
OPEN：Operation
SHOR
T
：Sto
p
6
7
OPEN：Phase control
SHORT：Frequency dividing
control