Flowchart For When The "Power" Led Is Turned Off - Mitsubishi MELSEC- Q Q12PHCPU User Manual

11 TROUBLESHOOTING

11.2.4 Flowchart for when the "POWER" LED is turned off

"POWER" LED is turned off.
Is there a power supply?
supply voltage within the
voltage range given in the
Is the power supply
protection and overvoltage
protection working?
Please consult your local Mitsubishi
service center or representative,
explaining a detailed description
of the problem.
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The following shows the flowchart to be followed when the "POWER" LED of the
power supply module turns off at PLC power-on or during operation.
NO
YES
Is the power
NO
specifications?
YES
NO
module fixed?
YES
Is overcurrent
YES
NO
Supply power.
NO
Can "POWER" LED
be turned on?
The supply voltage should be within
the rated range.
NO Can "POWER" LED
be turned on?
Properly fix the power supply module.
NO
Can "POWER" LED
be turned on?
1) Check the electric-current capacity
and reduce the amount of overcurrent.
2) Turn OFF the input power and wait
several minutes before turning it ON
again.
Can "POWER" LED
NO
be turned on?
MELSEC-Q
YES
YES
YES
YES
Completion
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