Troubleshooting With Leds; Pow Led [On/Flashing/Off]; Bat Led [On/Off] - Mitsubishi FX3UC SERIES User Manual

FX Series Programmable Controllers
3UC
User's Manual - Hardware Edition
12.5

Troubleshooting with LEDs

When trouble occurs, check the LEDs on the PLC to identify the problem with the PLC.

12.5.1 POW LED [on/flashing/off]

State of
LED
Power of the specified voltage is
On being correctly supplied to the power
supply terminal.
One of the following problems may
have occurred.
• Power of the specified voltage and
current is not being supplied to the
Flashing
power supply terminal.
• External wiring is incorrect.
• Internal error of PLC
One of the following problems may
have occurred.
• The power supply is off.
• External wiring is incorrect.
Off
• Power of the specified voltage is
not being supplied to the power
supply terminal.
• The power cable is broken.

12.5.2 BAT LED [on/off]

State of
LED
On The battery voltage is low.
The battery voltage is higher than the
Off
value set with D8006.
392
State of PLC
State of PLC
12 Test Operation, Adjustment, Maintenance and Troubleshooting
The power supply is normal.
• Check the supply voltage.
• After disconnecting the cables other than the power cable, re-
apply power to the PLC, and check for changes in the state. If
no improvement is obtained, consult your local Mitsubishi
Electric distributor.
• If the power is not off, check the power supply and the power
supply route.
If power is being supplied correctly, consult your local
Mitsubishi Electric distributor.
• After disconnecting the cables other than the power cable, re-
apply power to the PLC, and check for changes in the state. If
no improvement is obtained, consult your local Mitsubishi
Electric distributor.
Immediately replace the battery. (Refer to Subsection 12.4.3)
Normal
→ For details on the battery, refer to Section 11.5.
12.5 Troubleshooting with LEDs
Remedies
Remedies