Omron CPM1A operation manual Power Supply Check

Troubleshooting Flowcharts	Section 5-6
Power Supply Check

PWR indicator not lit.

Is power being		No
supplied?
	Yes
		No

Connect power supply.

Is PWR indicator lit? Yes

Is voltage adequate?

Yes

No

No

Set supply voltage within acceptable limits.

Is PWR indicator lit? Yes

Are there any loose		Yes
terminal screws or bro-
ken wires?
	No	No

Tighten screws or replace wires.

Is PWR indicator lit?

Yes

Has the external	Yes
power supply shorted

Correct the short circuit or limit the connected load to the spec-

or overloaded?

(see note)

No

No

Replace the CPU

Unit.

ification range

Is PWR indicator lit?

Yes

End

Note The PWR indicator will go out when there is a short circuit in the external power supply or an overload, only in the CPM1A-10CDR-jand CPM1A-20CDR-jCPU Units. In CPM1A-30CDR-jand CPM1A-40CDR-jCPU Units, when there is a short circuit or a overload, the external power supply voltage will drop but the PWR indicator will remain lit.

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