Mitsubishi Electric MELSEC iQ-R Series - 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

APPX
Appendix 3 Troubleshooting by Symptom
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Appendix 3 Troubleshooting by Symptom
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:
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:
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.
Check item Action
The power supply module is not mounted on the base unit properly. Remove the power supply module from the base unit, and mount it back on
the base unit. Then, restore power to the system.
The READY LED of the CPU module is on. An error has occurred in the power supply module. Replace the power supply
module.
Power supply voltage is not appropriate. Supply power voltage within the specified range. ( Page 85 Performance
Specifications of Power Supply Module)
The internal current consumption within the entire system has exceeded the
rated output current of the 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)
The POWER LED turns on when power is restored to the system after all
modules, except the power supply module, have been removed.
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.
Check item Action
The extension base unit that cannot be recognized is the Q series extension
base unit.
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)
The POWER LED of the power supply module of the extension base unit that
cannot be recognized is turned off.
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))
The extension cable is not correctly connected. Correctly connect the extension cable.
The specific extension base unit cannot be recognized even after the above
items were checked.
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.