Mitsubishi Q172CPU User Manual page 182

6 INSPECTION AND MAINTENANCE
(a) Flowchart for when "POWER" LED is turned off.
The following shows the flowchart when the "POWER" LED is turned off at
the power supply ON or during operation.
"POWER" LED is turned off
Is there a power supply?
YES
Is the wiring/
terminal block screws
connection correct?
YES
Is the power
supply voltage reaching 85 to
132VAC or 170 to 264VAC?
YES
Is the power supply
module fixed?
YES
Is overcurrent
protection and overvoltage
protection working?
NO
Explain the error symptom and get
advice from our sales representative.
6 - 15
NO
Supply power supply.
NO
Is "POWER"LED
turned on?
NO
Connect the wiring/terminal block
screws correctly.
NO Is "POWER"LED
turned on?
NO
The supply voltage should be within
the rated range.
Is "POWER"LED
NO
turned on?
NO
Fix the power supply module
correctly.
NO
Is "POWER"LED
turned on?
1) Check the current capacity and
YES
reduce the amount of overcurrent.
2) Turn the input power supply off and
then immediately turn it on.
Is "POWER"LED
NO
turned on?
YES
YES
YES
YES
YES
Completion