When The Run Led Flashes Or Turns Off; When The Err. Led Turns On Or Flashes - Mitsubishi Electric MELSEC-Q Series User Manual

8 TROUBLESHOOTING

8.3 When the RUN LED Flashes or Turns Off

8.4 When the ERR. LED Turns On or Flashes

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Check item
Is 5VDC supplied?
Is the sum of current capacities of the modules
mounted on the base unit equal to or less than
the current capacity of the power supply
module?
Has a watchdog timer error occurred?
Is a module change enabled during an online
module change?
(1) When the LED turns on
Check item
Is cold junction temperature compensation
resistance disconnected?
(2) When the LED flashes
Check item
Has a write data error occurred?
Action
• Check the power supply module.
• Mount the module securely.
Make the sum of current capacities of the
modules mounted on the base unit equal to or
less than the current capacity of the power
supply module.
• Reset the programmable controller CPU or
turn on the power supply module again.
• Change the Q62HLC.
Refer to Chapter 7 and handle it.
Action
Connect cold junction temperature
compensation resistance.
Q62HLC hardware failure.
Please consult your local Mitsubishi
representative.
Action
Check the error code list in Section 8.1 and
correct the sequence program.
MELSEC-Q
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