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10. TROUBLESHOOTING
10. TROUBLESHOOTING
10.1 Trouble at start-up
CAUTION
Excessive adjustment or change of parameter setting must not be made as it will
make operation instable.
POINT
Using the optional MR Configurator (servo configuration software), you can
refer to unrotated servo motor reasons, etc.
The following faults may occur at start-up. If any of such faults occurs, take the corresponding action.
10.1.1 Position control mode
(1) Troubleshooting
No. Start-up sequence Fault Investigation Possible cause Reference
Not improved if connectors
CN1, CN2 and CN3 are
disconnected.
1. Power supply voltage fault
2. Servo amplifier is faulty.
Improved when connectors
CN1 is disconnected.
Power supply of CNP1 cabling
is shorted.
Improved when connector
CN2 is disconnected.
1. Power supply of encoder
cabling is shorted.
2. Encoder is faulty.
LED is not lit.
LED flickers.
Improved when connector
CN3 is disconnected.
Power supply of CN3 cabling is
shorted.
1 Power on (Note)
Alarm occurs. Refer to section 10.2 and remove cause. Section 10.2
Alarm occurs. Refer to section 10.2 and remove cause. Section 10.2 2 Switch on servo-on
signal.
Servo motor shaft is
not servo-locked
(is free).
1. Check the display to see if
the servo amplifier is ready
to operate.
2. Check the external I/O
signal indication to see if
the servo-on (SON) signal
is ON.
1. Servo-on signal is not input.
(Wiring mistake)
2. 24VDC power is not supplied
to COM.
Section 6.6
Servo motor does not
rotate.
1. Wiring mistake
(a) For open collector pulse
train input, 24VDC power
is not supplied to OPC.
(b) LSP/LSN-VIN are not
connected.
2. No pulses is input.
Section 6.2
3 Enter input
command.
(Test operation)
Servo motor run in
reverse direction.
Check cumulative command
pulses.
1. Mistake in wiring to controller.
2. Mistake in setting of
parameter No.54.
Chapter 5
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