11 Troubleshooting
11.1 LED Diagnostics
119
FX3U-1PG User's Manual
11
Troubleshooting
A
Version
Information
B
Example
Connection
C
Differeces with
FX
2N
-1PG
11.1 LED Diagnostics
LED
display
State Content of Error Corrective action
POWER
OFF
5 V DC is not supplied via the extension cable from
PLC.
• Correctly connect the extension cable.
• Properly supply the power of the PLC.
• When the service power supply of the PLC main unit
is used, make sure that the supply capacity is not
exceeded.
ON
5 V DC is supplied via the extension cable from
PLC.
The power supply is normal.
STOP OFF
When the stop command is not input to the STOP
terminal.
When the LED does not turn on even when the STOP
command is input, check the input wires.
DOG OFF When DOG input is not entered.
When the LED does not turn on even when the DOG is
input, check the input wires.
PG0 OFF When zero point signal is not entered.
When the LED does not turn on even when the zero-point
signal is input, check the input wires.
FP OFF Forward pulse or pulse train interrupted. When the LED does not turn on or blink even when each
positioning operation is executed, check the following
items.
• Confirm that the positioning operation is executed in
the program of the PLC.
• When the STOP command or the forward limit/reverse
limit command is input, the pulse output is not
executed.
RP OFF Reverse pulse or directional output interrupted.
CLR
OFF CLR signal is not output.
• When the LED does not turn on when the zero return
completes, confirm that the zero return operation is
executed in the program of the PLC.
• When the LED does not turn on even when the
forward limit/reverse limit is on, confirm that the limit
deceleration mode (BFM#3 b11 or BFM#37 b11) is off
in the program of the PLC.
ON CLR signal is output.
When the deviation counter is not cleared at the servo
amplifier side even when the CLR signal is output, check
the output wire.
ERR
OFF Normal operation. No error.
Flicker Error occurred.
An error occurred at FX3U-1PG. Check the error code
(BFM#29) and take appropriate measures.
ON CPU error occurred.
If the FX3U-1PG does not fix the problem when powered
ON again, consult your local Mitsubishi Electric
representative.
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