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K2CU
Setting of Operating Current
Use the potentiometer on the front panel to set the operating cur-
rent.
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.
The knobs of the K2CU-F and K2CU-P as shown in the illustrations
are set to 32 A and 0.7 A respectively.
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
Three
Delta
phase
network
200 V
Star
network
200 V
V
network
200 V
Note: Values in this table are correct when a 200 VAC, 1 kW heater is used on a single-phase or three-phase current.
Knob
Normal condition
5 A
1 kW
5 A
8.7 A
200 V
1 kW
8.7 A
1 kW
200 V
1 kW
8.7 A
(5 A x
) 3
2.9 A
200 V
1 kW
2.9 A
1 kW
200 V
1 kW
2.9 A
1
(5 A x
)
3
5 A
200 V
1 kW
8.7 A
200 V
1 kW
5 A
(5 A x
= 8.7 A)
3
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.
Normal current + abnormal current
Set value =
Abnormal condition
0 A
200 V
7.5 A
7.5 A
3
(5 A x
x
)
3
2
2.5 A
2.5 A
1
3
(5 A x
x
)
2
3
2.5 A
2.5 A
(5A x 1/2)
K2CU
2
Red point
(indicates the set value)
0 A
5 A
8.7 A
5 A
1
(5 A x
x
)
3
3
2.5 A
2.5 A
1
3
(5 A x
x
)
2
3
5 A
5 A
(5A x 1)
5
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