When The Run Led Turns Off; When The Err.led Turns On; When The Ax Led Flashes After The Err.led Flashes; When The Axis/Ch Warning Occurrence Signal (X4 To X6) Turns On - Mitsubishi MELSEC-Q Series User Manual

15
TROUBLESHOOTING
15.1.1

When the RUN LED turns OFF

Check item
Is power supplied?
Is the capacity of the power supply module sufficient?
Is the watchdog timer occurring?
Are the modules correctly mounted to the base unit? Check the module mounting status.
15.1.2

When the ERR.LED turns ON

Check item
Is any error occurring?
15.1.3

When the AX LED flashes after the ERR.LED flashes

Check item
Is any axis error occurring?
15.1.4

When the axis/CH warning occurrence signal (X4 to X6) turns ON

Check item
Is any warning occurring?
Action
Check if the service voltage of the power supply module is
within the rated range.
Calculate the consumption current of the modules mounted
to the base unit such as CPU module, I/O module, and
intelligent function module, and check that the power capacity
is sufficient.
Reset the programmable controller CPU and check that the
RUN LED turns ON.
If the RUN LED does not turn ON, the module may be at
failure. Please consult your local Mitsubishi representative to
explain a detailed description of the problem.
Action
Check the error code and take measures described in
Section 15.2.1.
Action
Check the error code and take measures described in
Section 15.2.1.
Action
Check the warning code and take measures described in
Section 15.2.2.
15.1 Troubleshooting Flow
15.1.1 When the RUN LED turns OFF
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