132
9 TROUBLESHOOTING
9.1 Troubleshooting Procedure
9
TROUBLESHOOTING
Details on errors occurring in the system, their causes, and corrective actions are explained below.
For details on troubleshooting for each module, refer to the manuals for the module.
Saving the programs and devices used at the occurrence of an error helps in identifying the cause of the error.
(
9.1
Troubleshooting Procedure
If an error occurs, perform troubleshooting in the following order.
1.
Check that each module is properly mounted and wired.
2.
Check the LEDs of the CPU module. (
3.
Check the LEDs of each intelligent function module. (Manuals for each module)
4.
Connect the engineering tool and execute the system monitor. The error module can be identified. (
5.
Select the error module, and execute the module diagnostics. The error cause and the action to be taken can be
displayed. (
6.
If the cause could not be specified by Module diagnostics, check the error history from the event history of the
engineering tool to identify the cause. (
7.
Check the cause of the error and take corrective actions.
9.2
Checking with LEDs
Check the module status with LEDs as a means to perform the primary diagnosis.
Checking the PWR LED
If the PWR LED is turned off, check the following items.
If the PWR LED still does not turn on even after the items shown above are checked, there may be a hardware issue.
Consult your local Mitsubishi Electric representative.
Item to check
Cause and action
Measure the voltage supply to the CPU module.
If the power source is not supplying the proper voltage, provide a power source that does.
Remove extension modules and all wiring other than the
one for the power supply, and turn on the power supply.
If the PWR LED turns on in this condition, the 24 V DC service power supply may be shorted or
overloaded. Reconnect the modules and wire one by one to identify the cause.
Summary of Contents for MELSEC iQ-F Series
Page 1: ...MELSEC iQ F FX5UJ User s Manual Hardware ...
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Page 133: ...8 MAINTENANCE AND INSPECTION 8 2 Periodic Inspection 131 8 MEMO ...
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