• Accurately detects a burned heater element or elements incor-
porated by a molding machine or packing machine and outputs
an alarm signal.
• Precisely singles out the burned element even if one heater el-
ement among several heater elements has been burned out.
• Applicable to small- to large-capacity heater elements.
• All K2CU-F large-capacity, built-in current transformer models
work with both single-phase and three-phase heaters.
• Voltage fluctuation compensation function eliminates false
alarms due to variations in the supply voltage.
Model Number Structure
■
Model Number Legend
K2CU-@@@-@@
1
2 3 4
5 6
4. Voltage Compensation
None: Not provided
A:
Provided
5. Control Power Supply Voltage
A: 100/200 VAC
B: 110/220 VAC
C: 100 VAC
D: 110 VAC
E: 200 VAC
F: 220 VAC
6. Gate Input
None: Not provided
GS:
Provided
1. Heater Element Burnout Detector
2. Operation
F: Large-capacity, built-in Current Transformer model
P: Small-capacity plug-in model
3. Operating Current Range
0.5: 0.25 to 0.5 A
1: 0.5 to 1 A
2: 1 to 2 A
4: 2 to 4 A
10: 4 to 10 A
20: 8 to 20 A
40: 16 to 40 A
80: 32 to 80 A
Ordering Information
K2CU-F@@A-@GS Model with Gate Input Terminals
Control supply voltage
4 to 10 A
100 VAC
110 VAC
200 VAC
220 VAC
With voltage fluctuation compensation
K2CU-F10A-CGS
K2CU-F10A-DGS
K2CU-F10A-EGS
K2CU-F10A-FGS
Operating current
8 to 20 A
K2CU-F20A-CGS
K2CU-F20A-DGS
K2CU-F20A-EGS
K2CU-F20A-FGS
16 to 40 A
K2CU-F40A-CGS
K2CU-F40A-DGS
K2CU-F40A-EGS
K2CU-F40A-FGS
32 to 80 A
K2CU-F80A-CGS
K2CU-F80A-DGS
K2CU-F80A-EGS
K2CU-F80A-FGS
Note:
A model with a gate input terminal is required to combine the K2CU with a temperature controller that uses PID control for temperature control of a heater. To do
so, use a temperature controller with a voltage output.
1
K2CU
K2CU-F Large-capacity, Built-in Current Transformer Models
Control supply voltage
4 to 10 A
100 VAC
110 VAC
200 VAC
220 VAC
With voltage fluctuation compensation
K2CU-F10A-C
K2CU-F10A-D
K2CU-F10A-E
K2CU-F10A-F
K2CU-F20A-C
K2CU-F20A-D
K2CU-F20A-E
K2CU-F20A-F
Operating current
8 to 20 A
16 to 40 A
K2CU-F40A-C
K2CU-F40A-D
K2CU-F40A-E
K2CU-F40A-F
32 to 80 A
K2CU-F80A-C
K2CU-F80A-D
K2CU-F80A-E
K2CU-F80A-F
K2CU-P Small-capacity, Plug-in Models
Control supply voltage
0.25 to 0.5 A
100/
200 VAC
110/
220 VAC
With voltage fluctuation compensation
With voltage fluctuation compensation
K2CU-P0.5A-A
K2CU-P0.5A-B
Without voltage fluctuation compensation ---
Without voltage fluctuation compensation ---
K2CU-P1A-A
K2CU-P1-A
K2CU-P1A-B
K2CU-P1-B
Operating current
0.5 to 1 A
1 to 2 A
K2CU-P2A-A
K2CU-P2-A
K2CU-P2A-B
K2CU-P2-B
2 to 4 A
K2CU-P4A-A
K2CU-P4-A
K2CU-P4A-B
K2CU-P4-B
Specifications
■
Ratings
Item
Control supply voltage
Rated frequency
Carry current
Operating voltage range
Voltage fluctuation compensation
range
Operating current
Releasing current
Operate time
Gate input voltage range (for models
with gate input terminals)
Control output
Power consumption
100, 110, 200, 220 VAC
50/60 Hz
1.25 times as large as each model’s maximum operating cur- 2.5 A for K2CU-P0.5A-A/-B;
rent
5A
85% to 110% of control supply voltage
85% to 110% of control supply voltage
85% to 110% of control supply voltage (applicable only on
models with voltage fluctuation compensation)
K2CU-F
100/200, 110/220 VAC
K2CU-P
4 to 10 A, 8 to 20 A, 16 to 40 A, 32 to 80 A (continuously vari- 0.25 to 0.5 A, 0.5 to 1 A, 1 to 2 A, 2 to 4 A (continuously vari-
able)
able)
105% max. of operating current
0.5 s max. (when current changes from 150% to 0%)
5 to 30 VDC
2 A at 220 VAC, SPDT (cosφ = 0.4)
Input: 0.5 VA max.
Power supply: 5 VA max.
Input: 1 VA max.
Power supply: 4 VA max.
---
110% max. of operating current
■
Characteristics
Setting accuracy
Repeat accuracy
Influence of temperature
Influence of voltage
±7%
max.
±3%
max.
±10%
max. (at 20°C±30°C)
Models without voltage fluctuation compensation:
±3%
max. of the value measured at the control supply voltage, on condition that the voltage fluctuation is 85% to 110% of
the control supply voltage
Models with voltage fluctuation compensation:
±5%
max. of the logical value, on condition that the voltage fluctuation is 85% to 110% of the control supply voltage. (see
note)
±3%
max. (at
±5%
of rated frequency)
10 MΩ min. (at 500 VDC) between electric circuits and mounting panel
2,000 VAC, 50/60 Hz for 1 min between electric circuits and mounting panel
20 times of max. set value of operating current for 2 s
Destruction: 16.7 Hz, 1-mm double amplitude for 10 min each in X, Y, and Z directions
Destruction: 98 m/s
2
(approx. 10G)
Operating: –10°C to 55°C (with no icing)
Operating: 45% to 85%
K2CU-F: approx. 390 g; K2CU-P: approx. 300 g
Influence of frequency
Insulation resistance
Dielectric strength
Overcurrent
Vibration resistance
Shock resistance
Ambient temperature
Ambient humidity
Weight
Note:
The logical value is an operating value within a range of 0.85 to 1.1 with a voltage fluctuation of 85% to 110%, based on the value at the control supply voltage
measured as 1.
2
K2CU
Operation
K2CU-F@@A-@GS Series
When power is supplied to the heater (when the SSR is ON), a cur-
rent flows through the wires to the heater elements. At the same
time, a voltage is imposed on the gate circuit and the K2CU-
F@@A@GS begins monitoring the current flowing through the heater
wires.
The current flowing to the heater wires is detected by the detector
sections through each Current Transformer (CT) incorporated by the
K2CU-F@@A-@GS.
The current signals transmitted by the two CTs are sent to the cur-
rent-voltage converters, smoothing circuits, and comparators as
shown in the diagram.
Power supply
The signal generated by the reference voltage generator is sent to
the setting circuit to provide a reference value. The reference value is
sent to the comparators. Each comparator compares its heater ele-
ment current input and the reference value. If the input is lower than
the reference value, a signal is sent to the output circuit.
There are two detector sections operating independently. If either of
the input signals from the CTs is lower than the reference value, the
output relay and alarm indicator will be activated.
The K2CU-F@@A-@GS incorporates a voltage fluctuation compen-
sation function which automatically corrects the reference value if the
supply voltage fluctuates.
SSR
+
DC
−
Temperature
controller
Current
voltage
converter
Reference
voltage
generator
G+
Smoothing
circuit
G−
Setting circuit
Comparator
S
1
Power circuit
S
2
CT
1
Gate circuit
b
1
To each circuit
X/c
a
1
Output circuit
Comparator
Current
voltage
converter
Smoothing
circuit
CT
2
X
Output relay
Alarm indicator
CM
1
Buzzer
BZ
Note:
1. The dotted lines indicate the line conductors passing through the
windows
of the current transformers.
2. The current flowing into the gate circuit (between G+ and G−) is as follows:
Approximately 1.4 mA at 5
VDC
Approximately 3.4 mA at 12
VDC
Approximately 6.7 mA at 24
VDC
3.
When using
a K2CU
which
has the model number suffix "GS" (a model that incorporates gate
input terminals), the control output of the temperature controller must
be
a
voltage
output type.
Heater elements
3
K2CU
K2CU-F Series
When power is supplied to the heater (when the contactor is ON), a
current flows through the wires to the heater elements. At the same
time, a voltage is imposed on the power circuit of the K2CU-F.
The current flowing to the heater wires is detected by the detector
sections through each Current Transformer (CT) incorporated by the
K2CU-F.
The current signals transmitted by the two CTs are sent to the cur-
rent-voltage converters, smoothing circuits, and comparators as
shown in the diagram.
The signal generated by the reference voltage generator is sent to
the setting circuit to provide a reference value. The reference value is
sent to the comparators. Each comparator compares its heater ele-
ment current input and the reference value. If the input is lower than
the reference value, a signal is sent to the output circuit.
There are two detector sections operating independently. If either of
the input signals from the CTs is lower than the reference value, the
output relay and alarm indicator will be activated.
The K2CU-F incorporates a voltage fluctuation compensation func-
tion which automatically corrects the reference value if the supply
voltage fluctuates.
Power supply
Contactor
S
1
Current
voltage
converter
Reference
voltage
generator
Setting circuit
Comparator
Smoothing
circuit
S
2
CT
1
Power circuit
b
1
X/c
To each circuit
a
1
Current
voltage
converter
CT
2
Output circuit
Smoothing
circuit
Comparator
X
Output relay
Alarm indicator
CM
1
BZ
Buzzer
Note:
The dotted lines indicate the line conductors passing through the
windows
of the current transformers.
Heater elements
K2CU-P Series
The K2CU-P operates basically in the same way as the K2CU-F.
The comparator compares external current signals and the reference
value and outputs the result of the comparison to the output circuit.
Power supply
Contactor
200/220
V
100/110
V
Reference
voltage
generator
0
V
6
Power circuit
7
8
Current
voltage
converter
1
CT
Setting circuit
Smoothing
circuit
5
X/c
To each circuit
4
3
Output circuit
Comparator
2
X
Output relay
Alarm indicator
BZ
Buzzer
Heater elements
Note:
The heater and the operating power supply
connected
via
terminals 6 and
8
or terminals
7 and
8
must
be
turned ON at the same time.
4
K2CU
■
Setting of Operating Current
Use the potentiometer on the front panel to set the operating current.
Rotate the knob to set the desired current value at which the Heater
Burnout Detector should operate. Do not exceed the maximum and
minimum positions.
The K2CU-F’s scale is divided into 12 graduations including sub-
graduations and the K2CU-P’s scale is divided into 5 graduations.
HEATER FAULT DETECTOR
ALARM
The knobs of the K2CU-F and K2CU-P as shown in the illustrations
are set to 32 A and 0.7 A respectively.
The set operating current is defined as the mean value of the heater
current under normal operating conditions and the heater current
under a burnout or abnormal condition.
Set
value
=
Normal
current + abnormal current
2
ALARM
6
5
4
S
1
7
8
9
10
×
K2CU-P1A-A
14 16
12
10
×
HEATER FAULT DETECTOR
4 A
18
20
0.5
A
S
2
K2CU-F40A-C
OMRON Corporation
MADE IN JAPAN
SOURCE
100/200
VAC
50/60Hz
100/200VAC
CURRINT 5A/AC/Max.
Knob
Red point
(indicates the set
value)
■
Heater Connection and Current
The following table shows the different connections possible. The formula under each illustration indicates the electrical current value of the heater
elements under normal and abnormal conditions.
Phase
Single phase
200
V
Normal condition
5A
Abnormal condition
0A
1 kW
200
V
5A
0A
7.5 A
5A
Three phase Delta network
200
V
8.7
A
1 kW
1 kW
200
V
8.7
A
7.5 A
8.7
A
200
V
8.7
A
1 kW
5A
(5 A
×
√
3)
(5 A
×
√
3
×
2.5 A
√
3
2
)
(5 A
×
√
3
×
2.5 A
1
√
3
)
Star network
200
V
200
V
200
V
2.9 A
1 kW
1 kW
2.9 A
1 kW
2.9 A
2.5 A
2.5 A
(5 A
×
1
√
3
)
(5 A
×
2.5 A
1 kW
1
√
3
×
)
2
√
3
(5 A
×
5A
√
3
1
√
3
×
)
2
V network
200
V
200
V
200
V
5A
8.7
A
5A
5A
1 kW
2.5 A
(5 A
×
√
3 =
8.7
A)
1
(5 A
×
2 )
(5 A
×
1)
Note:
Values in this table are correct when a 200 VAC, 1 kW heater is used on a single-phase or three-phase current.
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