Omron K2CU-F10A-CGS, K2CU-F80A-CGS, K2CU-F20A-CGS, K2CU-F40A-CGS, K2CU-F10A-DGS User Manual
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1
Heater Element Burnout Detector
K2CU
Accurate Detection of Heater Element
Burnout Regardless of Heater
Capacities
Accurately detects a burned heater element or
elements incorporated by a molding machine or
packing machine and outputs an alarm signal.
Precisely singles out the burned element even if
one heater element 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.
Ordering Information
K2CU-FjjA-jGS Model with Gate Input Terminals
Control
supply voltage
Operating current
4 to 10 A 8 to 20 A
16 to 40 A 32 to 80 A
100 V
AC W
ith voltage fluctuation
K2CU-F10A-CGS K2CU-F20A-CGS K2CU-F40A-CGS K2CU-F80A-CGS
1
10 V
AC compensation K2CU-F10A-DGS K2CU-F20A-DGS K2CU-F40A-DGS K2CU-F80A-DGS
200 V
AC K2CU-F10A-EGS K2CU-F20A-EGS K2CU-F40A-EGS K2CU-F80A-EGS
220 V
AC K2CU-F10A-FGS K2CU-F20A-FGS K2CU-F40A-FGS K2CU-F80A-FGS
K2CU-F Large-capacity, Built-in Current Transformer Models
Control
supply voltage
Operating current
4 to 10 A 8 to 20 A
16 to 40 A 32 to 80 A
100 V
AC W
ith voltage fluctuation
K2CU-F10A-C K2CU-F20A-C K2CU-F40A-C K2CU-F80A-C
1
10 V
AC compensation K2CU-F10A-D K2CU-F20A-D K2CU-F40A-D K2CU-F80A-D
200 V
AC K2CU-F10A-E K2CU-F20A-E K2CU-F40A-E K2CU-F80A-E
220 V
AC K2CU-F10A-F K2CU-F20A-F K2CU-F40A-F K2CU-F80A-F
K2CU-P Small-capacity, Plug-in Models
Control
supply voltage
Operating current
0.25 to 0.5 A
0.5 to 1 A
1 to 2 A 2 to 4 A
100/
200 V
AC
W
ith voltage fluctuation
compensation
K2CU-P0.5A-A K2CU-P1A-A K2CU-P2A-A K2CU-P4A-A
W
ithout voltage
fluctuation compensation
--- K2CU-P1-A K2CU-P2-A K2CU-P4-A
110/
220 V
AC
W
ith voltage fluctuation
compensation
K2CU-P0.5A-B K2CU-P1A-B K2CU-P2A-B K2CU-P4A-B
W
ithout voltage
fluctuation compensation
--- K2CU-P1-B K2CU-P2-B K2CU-P4-B
K2CU
K2CU
2
Specifications
Ratings
Item K2CU-F K2CU-P
Control
supply voltage
100, 1
10, 200, 220 V
AC
100/200, 1
10/220 V
AC
Rated frequency
50/60 Hz
Carry current
1.25 times as large as each model’
s
maximum operating current
2.5 A for K2CU-P0.5A-A/-B;
5 A
Operating voltage range
85% to 1
10% of control supply voltage
V
oltage fluctuation compensation
range
85% to 1
10% of control supply voltage
85% to 1
10% of control supply voltage
(applicable only on models with voltage
fluctuation compensation)
Operating current
4 to 10 A, 8 to 20 A, 16 to 40 A, 32 to 80 A
(continuously variable)
0.25 to 0.5 A, 0.5 to 1 A, 1 to 2 A, 2 to 4 A
(continuously variable)
Releasing current
105% max. of operating current
1
10% max. of operating current
Operate time
0.5 s max. (when current changes from 150% to 0%)
Gate input voltage range (for
models with gate input terminals)
5 to 30 VDC
---
Control output
2 A at 220 V
AC, SPDT (cosφ
= 0.4)
Power consumption
Input: 0.5 V
A max.
Power supply: 5 V
A max.
Input: 1 V
A max.
Power supply: 4 V
A max.
Characteristics
Setting
accuracy
±
7% max.
Repeat accuracy
±
3% max.
Influence of temperature
±
10% max. (at 20
°C±30°C)
Influence of voltage
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 1
10% 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 1
10% of the
control supply voltage. (see note)
Influence of frequency
±
3% max. (at ±5% of rated frequency)
Insulation resistance
10 MΩ min. (at 500 VDC) between electric circuits and mounting panel
Dielectric strength
2,000 V
AC, 50/60 Hz for 1 min between electric circuits and mounting panel
Overcurrent
20 times of max. set value of operating current for 2 s
V
ibration resistance
Destruction: 16.7 Hz, 1-mm double amplitude for 10 min each in X, Y
, and Z directions
Shock resistance
Destruction: 100 m/s2 (approx. 10G)
Ambient temperature
Operating: –10°C to 55°C (with no icing)
Ambient humidity
Operating: 45% to 85%
Weight
K2CU-F: approx. 390 g; K2CU-P: approx. 300 g
Note: The
logical value is an operating value within a range of 0.85 to 1.1 with a voltage fluctuation of 85% to 1
10%, based on the value at the
control
supply voltage measured as 1.
K2CU
K2CU
3
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-FjjAjGS 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-FjjA-jGS.
The
current signals transmitted by the two CT
s 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
element
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 CT
s is lower than the reference value, the
output
relay and alarm indicator will be activated.
The K2CU-FjjA-jGS incorporates a voltage fluctuation compensation
function which automatically corrects the reference value
if
the supply voltage fluctuates.
Currentvoltage
converter
Smoothing
circuit
Gate
circuit
Setting
circuit
Reference
voltage
generator
Power
circuit
Currentvoltage
converter
Smoothing
circuit
BZ
Output
circuit
Temperature
controller
X CM1
a1
b1
S2S1G–G+
CT
1
CT
2
SSR DC
Heater elements
Power source
X/c
Output relay
Alarm indicator
Buzzer
To each circuit
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 suf
fix ”GS” (a model that incorporates gate input
terminals), the control output of the temperature controller must be a voltage output type.
Comparator
Comparator
K2CU
K2CU
4
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 CT
s 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
element
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 CT
s 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.
Currentvoltage
converter
Smoothing
circuit
Setting
circuit
Reference
voltage
generator
Power
circuit
Currentvoltage
converter
Smoothing
circuit
BZ
Output
circuit
X CM1
a1
b1
S2S1
CT
1
CT
2
Heater elements
Power source
X/c
Output relay
Alarm indicator
Buzzer
To each circuit
Comparator
Comparator
Note: The
dotted lines indicate the line conductors passing through the windows of the current transformers.
Contactor
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.
Currentvoltage
converter
Smoothing
circuit
Setting
circuit
Power
circuit
BZ
Output
circuit
X
3
4
5
87
Comparator
Reference
voltage
generator
Heater elements
Power source
X/c
Output relay
Alarm indicator
To each circuit
Contactor
6
Buzzer
CT
1
2
200/220 V 100/110 V 0 V
K2CU
K2CU
5
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 subgraduations
and the K2CU-P’
s scale is divided into 5 graduations.
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
Knob
Red point
(indicates the set value)
Heater Connection and Current
The
following table shows the dif
ferent connections possible. The formula under each illustration indicates the electrical current value of
the
heater
elements under normal and abnormal conditions.
Phase
Normal condition
Abnormal condition
Single phase
200 V
5 A
5 A
1 kW
200 V
0 A
0 A
Three
phase
Delta
network
200 V
200 V
200 V
8.7 A
8.7 A
8.7 A
1 kW
1 kW
1 kW
(5 A x )
3
7.5 A
7.5 A
3
2
(5 A x x )
3
5 A
8.7 A
5 A
1
3
(5 A x x )
3
Star
network
200 V
200 V
200 V
2.9 A
2.9 A
2.9 A
1 kW
1 kW
1 kW
1
3
(5 A x )
2.5 A
2.5 A
3
2
(5 A x x )
1
3
2.5 A
2.5 A
3
2
(5 A x x )
1
3
V
network
200 V
200 V
200 V
5 A
8.7 A
5 A
1 kW
1 kW
(5 A x = 8.7 A)
3
(5A x 1/2)
2.5 A
2.5 A
5 A
5 A
(5A x 1)
Note: Values
in this table are correct when a 200 V
AC, 1 kW heater is used on a single-phase or three-phase current.
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