Troubleshooting By Symptom - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

Troubleshooting by symptom

When the POWER LED turns off
Check item
Check whether the power is supplied.
Check whether the capacities of the CPU module extension power supply
modules are enough.
Check whether the module is mounted properly.
When the RUN LED flashes or turns off
■When flashing
Check item
Check whether the module is in offset/gain setting
mode.
■When turns off
Check item
Check whether the power is supplied.
Check whether the capacities of the CPU module extension power supply
modules are enough.
Check whether the module is mounted properly.
Cases other than the above
When the ERROR LED flashes or turns on
■When flashing
Check item
Check whether a moderate error has occurred.
■When turns on
Check item
Check whether any error has occurred.
1 FX5-4AD
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1.10 Troubleshooting
Corrective action
Check that power is supplied to the CPU and extension power supply modules.
Calculate the current consumption of the I/O modules, and intelligent function
modules to check that the power supply capacity for the CPU module and
extension power supply module is enough.
Check that the extension cable is inserted correctly.
Cause
In the GX Works3 module parameter setting, the
CPU module was powered offon or reset when
the operation mode setting was the offset/gain
setting mode.
The value in the mode switching setting has been
changed and the mode has been switched to
offset/gain setting mode.
Corrective action
Check that power is supplied to the CPU and extension power supply modules.
Calculate the current consumption of the I/O modules, and intelligent function
modules to check that the power supply capacity for the CPU module and
extension power supply module is enough.
Check that the extension cable is inserted correctly.
Reset the CPU module, and check if the RUN LED turns on. If the RUN LED still
remains off, the possible cause is a failure of the module. Please consult your
local Mitsubishi representative.
Action
Power offon the module.
If the error occurs again, the possible cause is a failure of the module. Please
consult your local Mitsubishi representative.
Action
Check Latest error code and take actions described in the list of error codes.
(Page 103 List of error codes)
Corrective action
In the GX Works3 module parameter setting, set
the operation mode setting to normal and power
offon or reset the CPU module.
Review the program that uses the mode switching
setting to check whether the mode has been
switched erroneously.