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Wiring and Connections Section 3-4
Inductive Loads
When connecting an inductive load to an input, connect a surge protector or
diode in parallel with the load.
The surge protector’s components should have the following ratings:
The diode should satisfy the following requirements:
Peak reverse-breakdown voltage must be at least 3 times the load voltage.
Average rectified current must be 1 A.
Inrush Current Considerations
When switching a load with a high inrush current in the CPM2C relay output or
transistor output model, such as an incandescent lamp, suppress the inrush
current as shown below.
OUT
COM
CPM2C
Surge protector
Relay Output
OUT
COM
CPM2C
Diode
Relay Output
Transistor Output
(Sinking)
OUT
COM
CPM2C
Diode
Relay Output
Transistor Output
(Sourcing)
R
R
Countermeasure 1
Providing a dark current of
approx. one-third of the rated value
through an incandescent lamp
Countermeasure 2
Providing a limiting resistor
OUT
COM
OUT
COM
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