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 turning 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.
Other than the above
When the ERROR LED flashes or turns on
■When flashing
Check item
Check whether the 24 V DC external power supply is supplied.
Check whether a moderate error has occurred.
■When turning on
Check item
Check whether any error has occurred.
The ALM LED turns on
■When turning on
Check item
Check whether any alert has been issued.
2 FX5-4DA
270
2.10 Troubleshooting
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.
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.
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
Confirm if FX5-4DA is connected properly to the external power supply of 24 V
DC. Also, confirm if the supply of the voltage from the external power supply of
24 V DC to FX5-4DA is started before the system power supply turns on.
Check Latest error code and take actions described in the list of error codes.
(Page 273 List of error codes)
Action
Check Latest error code and take actions described in the list of error codes.
(Page 273 List of error codes)
Action
Check the latest alarm code and take action as described in the list of alarm
codes. (Page 276 List of alarm codes)