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128

Power Supply Check

PWR indicator not lit.

Replace the CPU

Unit.

Is power being

supplied?

Is voltage adequate?

Are there any loose

terminal screws or bro-

ken wires?

Connect power

supply.

Is PWR indicator lit?

Set supply voltage

within acceptable limits.

Is PWR indicator lit?

Tighten screws or

replace wires.

End

Yes

Is PWR indicator lit?

Yes

Has the external

power supply shorted

or overloaded?

(see note)

Correct the short circuit or limit

the connected load to the spec-

ification range

Is PWR indicator lit?

Yes

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- and CPM1A-20CDR-

CPU Units. In CPM1A-30CDR- and CPM1A-40CDR- CPU Units, when

there is a short circuit or a overload, the external power supply voltage will drop

but the PWR indicator will remain lit.

Troubleshooting Flowcharts

Section 5-6

Omron CPM1A User Manual

Other manuals for Omron CPM1A