When The Run Led Turns Off; When The Run Led And Err. Led Turn On - Mitsubishi Electric MELSECQ Series User Manual

8
TROUBLESHOOTING
8.1.2
Is power supplied?
Is the capacity of the power supply module
sufficient?
No watchdog timer error?
Are the modules correctly mounted to the base
unit?
8.1.3
No error?
8
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When the RUN LED turns OFF

Table 8.4 When the RUN LED turns OFF
Check item

When the RUN LED and ERR. LED turn ON

Table 8.5 When the RUN LED and ERR. LED turn ON
Check item
8.1 Error Processing and Recovery Methods
8.1.2 When the RUN LED turns OFF
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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 current capacity is sufficient.
Reset the programmable controller CPU and check
that the RUN LED turns ON. If the RUN LED
remains OFF even doing so, the QD63P6 is a
failure. Please consult your local Mitsubishi
representative, explaining a detailed description of
the problem.
Check the module mounting status.
Action
Check the error code of the used channel
(Un\G20) and take measures described in Error
Codes List.
Reference
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Section 4.3
Section 4.1
Reference
Section 8.5