Omron CPM2A - 11-2005 User Manual

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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:
OUT
COM
CPM2A
Surge protector
Relay Output
OUT
COM
CPM2A
Diode
Relay Output
Transistor Output
(Sinking)
OUT
COM
CPM2A
Diode
Relay Output
Transistor Output
(Sourcing)
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 CPM2A relay output or
transistor output model, such as an incandescent lamp, suppress the inrush cur-
rent as shown below.
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
Fuse Insertion
The CPM2A with transistor output may burn if the load is short-circuited, there-
fore, insert a protective fuse in series to the load.
Crimp Terminals
Caution Always use crimp terminals for the CPM2A’s I/O lines or use solid wire (instead
of a stranded wire). Do not connect bare stranded wires directly to terminals.
Stray wire strands can short-circuit and cause a fire.
Use M3 crimp terminals and tighten the terminal screws to a torque of 0.5 N S m.
6.2 mm max. 6.2 mm max.
Fork terminal Ring terminal
The recommended wire size for solid wires is 0.4 to 1.2 mm (AWG26 to AWG18).
Wiring and Connections
Section 3-4

Omron CPM2A - 11-2005 Specifications

General

Category	Controller
Manufacturer	Omron
Output Type	Relay
Input Voltage	24 VDC
Supply Voltage	100 to 240 VAC
Timer/Counter	256
Communication Port	RS-232
Operating Temperature	0 to 55°C
Humidity	10% to 90% RH (with no condensation)
Program Capacity	2048 Steps