Appendix 3 Troubleshooting By Symptom; When The Power Led Of The Power Supply Module Turns Off, Or The Err Contact Turns Off (Opens); When The Specific Extension Base Unit Cannot Be Recognized - Mitsubishi Electric MELSEC iQ-R Series Configuration Manual

Appendix 3
This section describes troubleshooting of power supply modules and base units.
When the POWER LED of the power supply module turns off, or
the ERR contact turns off (opens)
Check the following:
Check item
The power supply module is not mounted on the base unit properly.
The READY LED of the CPU module is on.
Power supply voltage is not appropriate.
The internal current consumption within the entire system has exceeded the
rated output current of the power supply module.
The POWER LED turns on when power is restored to the system after all
modules, except the power supply module, have been removed.
If the POWER LED of the power supply module does not turn on even after the items above are checked and the actions are
taken, the possible cause is a hardware failure of the power supply module. Please consult your local Mitsubishi
representative.

When the specific extension base unit cannot be recognized

Check the following:
Check item
The extension base unit that cannot be recognized is the Q series extension
base unit.
The POWER LED of the power supply module of the extension base unit that
cannot be recognized is turned off.
The extension cable is not correctly connected.
The specific extension base unit cannot be recognized even after the above
items were checked.
If the specific extension base unit cannot be recognized even after the items above are checked and the actions are taken,
the possible cause is a hardware failure. Please consult your local Mitsubishi representative.
Troubleshooting by Symptom
Action
Remove the power supply module from the base unit, and mount it back on
the base unit. Then, restore power to the system.
An error has occurred in the power supply module. Replace the power supply
module.
Supply power voltage within the specified range. ( Page 85 Performance
Specifications of Power Supply Module)
Review the system configuration so that the internal current consumption
does not exceed the rated output current. ( Page 57 Consideration for
internal current consumption)
An error has occurred in a module other than the power supply module.
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 has been failed. Replace the module.
Action
Refer to the troubleshooting for the case where the specific Q series
extension base unit cannot be recognized. ( Page 156 When the specific
Q series extension base unit cannot be recognized)
Refer to the troubleshooting for the power supply module. ( Page 155
When the POWER LED of the power supply module turns off, or the ERR
contact turns off (opens))
Correctly connect the extension cable.
Take actions in the following order.
• Replace the extension cable.
• Replace the extension base unit.
• Replace the base unit on the upper level of the extension base unit.

Appendix 3 Troubleshooting by Symptom

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