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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 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

Refer to

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-SG 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