Troubleshooting - Mitsubishi Electric MELSEC FX Series User Manual

FX -4LC User's Manual
3U

10. Troubleshooting

When a fault occurs, check the power supply voltage, the PLC main unit and the 4LC for loose terminal
screws, and examine the connectors for a defective contact.
STARTUP AND MAINTENANCE
PRECAUTIONS
• Make sure to connect the battery correctly. Do not charge, disassemble, heat, short-circuit, or expose the battery to fire.
Doing so may rupture or ignite it.
• Do not touch any terminal while the PLC's power is on.
Doing so may cause electric shock or malfunctions.
• Before modifying or disrupting the program in operation or running the PLC, carefully read through this manual and the associated
manuals and ensure the safety of the operation.
An operation error may damage the machinery or cause accidents.
STARTUP AND MAINTENANCE
PRECAUTIONS
• Do not disassemble or modify the PLC.
Doing so may cause fire, equipment failures, or malfunctions.
For repair, contact your local Mitsubishi Electric distributor.
• Turn off the power to the PLC before attaching or detaching the following devices.
Failure to do so may cause device failures or malfunctions.
- Peripheral devices, display modules, expansion boards and special adapters
- I/O extension units/blocks, FX Series terminal block and the special function units/blocks
- Battery and memory cassette
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