When The Power Led Does Not Turn On; When The Power Led Does Not Turn On In Green - Mitsubishi Electric Q26UD(E)HCPU User Manual

15.1.1

When the POWER LED does not turn on

Check the following.
The MODE LED of the CPU module is on.
Power supply voltage is not appropriate.
The internal current consumption for the entire system
exceeds the rated output current of the power supply
module.
The POWER LED turns on when power is supplied again to
the system after all modules, except for the power supply
module, were removed.
If the POWER LED does not turn on even after taking the above actions, the possible cause is a hardware failure of
the power supply module or base unit.
Please consult your local Mitsubishi representative.
15.1.2

When the POWER LED does not turn on in green

Check the following items according to the POWER LED status.
(1) When the POWER LED turns on in red
Remove the power supply module and mount it to the normal base unit. Resupply power to the system.
If the POWER LED turns on in red after resupplying power, the power supply module is failed.
If the POWER LED does not turn on even after the power is supplied during the above operation, also
check the items described in
(2) When the POWER LED flickers in orange
Resupply power to the system. If the POWER LED flickers in orange after resupplying power, the power supply
module is failed.
If the POWER LED does not turn on even after the power is supplied during the above operation, also check the
items described in
278
Check item
Page 278, Section 15.1.1.
Page 278, Section 15.1.1.
Corrective action
The power supply module has failed. Replace the power
supply module.
Supply power voltage within the specified range.
( Page 196, Section 7.2)
Reexamine the system configuration so that the internal
current consumption does not exceed the rated output
current.
( Page 674, Appendix 10)
Repeatedly supply power to the system, returning the
modules back to the system one by one.
The last module mounted immediately before the POWER
LED turned off is failed.