Power Distribution Module Troubleshooting; When Run Led Is Flickering Or Off (Common To Bus Refreshing Module And Power Feeding Module); When Err. Led Is On Or Flickering - Mitsubishi MELESEC-ST User Manual

12 TROUBLESHOOTING

12.2 Power Distribution Module Troubleshooting

12.2.1 When RUN LED is flickering or off (Common to bus refreshing module and power
feeding module)

12.2.2 When ERR. LED is on or flickering

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(1) Flickering at 0.25s intervals
Check item
Check whether the power
distribution module is selected as
the target of online module change.
POINT
Only the I/O modules and intelligent function modules can be replaced online.
The power distribution modules and base modules cannot be replaced online.
Before changing the power distribution module or base module, make sure to shut
off all phases of the external power supply for the whole system. Failure to do so
may damage all products comprising the MELSEC-ST system.
(2) Flickering at 1s intervals
When the RUN LED of the power distribution module is flickering (1s interval),
refer to Section 12.1.3 for details.
(3) Off
When the RUN LED of the power distribution module is off, refer to Section
12.1.2 for details.
(1) When ERR. LED is on
ERR. LED is on.
Change the power
distribution module
whose ERR. LED is
on.
Has the ERR.
LED turned
off?
YES
Completed
Select a slice module other than the power distribution
module as the target of online module change.
Refer to the head module manual for details.
NO
Please contact your local
Mitsubishi service center or
representative, explaining a
detailed description of the
problem.
MELSEC-ST
Corrective action
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