Mitsubishi Electric Melsec-Q172DCPU User Manual page 206

6 INSPECTION AND MAINTENANCE
(a) Flowchart for when "POWER" LED turns off
The following shows the flowchart for when "POWER" LED of the power
supply module turns off at the power supply ON or during operation.
"POWER" LED turns off
Is there a power supply?
YES
Is the wiring/
terminal connection
correct?
YES
Is the power
supply voltage within the
rated range?
YES
Is the power supply
module fixed?
YES
1)
NO
Supply power.
NO
Does "POWER"
LED turn on?
NO
Connect wiring and fix terminal
connection correctly.
NO
Does "POWER"
LED turn on?
NO
The supply voltage should be within
the rated range.
NO
Does "POWER"
LED turn on?
NO
Fix the power supply module correctly.
NO
Does "POWER"
LED turn on?
6 - 17
YES
YES
YES
YES
END