K2CU
K2CU
5
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.
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 c abnormal current
2
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
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 VAC, 1 kW heater is used on a single-phase or three-phase current.
