Mitsubishi MELSEC iQ-F FX5UC, User Manual

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9 TROUBLESHOOTING
9.1 Troubleshooting Procedure
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9
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 identifying the cause of the error.
(
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Page 132 Backing Up the Data)
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. (
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Page 127 Checking with LEDs)
3.
Check the LEDs of each intelligent function module. (Manuals for each module)
4.
Connect the engineering tool and execute the Module Diagnostics (CPU Diagnostics). The error cause and the action to
be taken can be displayed. (
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Page 129 Module Diagnostics (CPU Diagnostics))
5.
If the cause could not be specified by Module diagnostics (CPU Diagnostics), check the error history from the event
history of the engineering tool to identify the cause. (
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Page 130 Event history)
6.
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.
Checking the BAT LED
If the BAT LED is flashing, check the following items.
The LED is valid when the optional battery is installed and the LED is set to "display" for battery errors by using the parameter.
Item to check Cause and action
Measure the voltage supplying 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, or overloaded. Reconnect the modules and wire one by one
to identify the cause.
Item to check Cause and action
Check the installation of the battery. Install the battery properly.
Check the battery voltage. If the battery voltage is reduced, replace the battery with a new one.
Battery voltage can be monitored with PLC data register SD8005.
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Page 123 Battery)