Omron FQM1-MMA21 User Manual

Power Supply Unit's

POWER indicator is not lit.

Is power being supplied 

to the Module?

Connect power supply.

No

Yes

Yes

No

End

Note

Model

Supply voltage

Permissible range

CJ1W-PA205R

100 to 240V AC

85 to 264V AC

CJ1W-PA202

100 to 240V AC

85 to 264V AC

No

No

Yes

Yes

No

Yes

Is POWER indicator lit?

Is voltage in range? 

(See note.)

Keep voltage fluctuations 
within the permissible range.

Is POWER indicator lit?

Is POWER indicator lit?

Are terminal 

screws loose or 

wires broken?

Yes

No

Tighten screws or replace 
damaged wires.

Replace the Module.