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8. TROUBLESHOOTING
8-1 Troubleshooting at start-up
Excessive adjustment or change of parameter setting must not be made as it will
CAUTION
make operation instable.
The following faults may occur at start-up. If any of such faults occurs, take the corresponding
action.
8-1-1 Position control mode
(1) Troubleshooting
No. Start-Up Sequence
1
Power on
2
Switch on servo-on
signal.
3
Enter input
command.
(Test operation)
4
Gain adjustment
5
Cyclic operation
Fault
Not improved if connectors
• LED is not lit.
CN1A, CN1B and CN2 are
• LED flickers.
disconnected.
Improved when connectors
CN1A and CN1B are
disconnected.
Improved when connector
CN2 is disconnected.
Improved when connector
CN3 is disconnected.
Alarm occurs.
Refer to Section 8-2 and remove cause.
Alarm occurs.
Refer to Section 8-2 and remove cause.
Servo motor shaft is
1. Check the display to see
not servo-locked
if the servo amplifier is
(is free).
ready to operate.
2. Check the external I/O
signal indication to see
if the servo-on (SON)
signal is ON.
Servo motor does not
Check cumulative
rotate.
command pulses.
Rotational ripples
Make gain adjustment in
(speed fluctuations)
the following procedure:
are large at low
1) Increase the auto
speed.
2) Repeat acceleration
Make gain adjustment in
Large load inertia
the following procedure:
moment causes the
If the servo motor may
servo motor to
be run with safety,
oscillate side to side.
repeat acceleration and
deceleration several
times to complete auto
tuning.
Confirm the cumulative
Position shift occurs.
command pulses, cumulative
feedback pulses and actual
servo motor position.
Investigation
1) Power supply voltage fault
2) Servo amplifier is faulty.
Power supply of CN1 cabling
is shorted.
1) Power supply of encoder
2) Encoder is faulty.
Power supply is shorted.
1) Servo on signal is not
2) 24VDC power is not
1) Wiring mistake
2) No pulse is input.
Gain adjustment fault
tuning response level.
and deceleration
several times to
complete auto tuning.
Gain adjustment fault
Pulse counting error, etc.
due to noise.
8– 2
Possible Cause
cabling is shorted.
input. (Wiring mistake)
supplied to COM.
(a) For open collector
pulse train input,
24VDC power is not
supplied to OPC.
(b) LSP/LSN-SG are not
connected.
Refer To
Section 8-2
Section 8-2
(1), Section 2-3-3
Section 2-3-2
Section 2-4
Section 2-4
(2) in this section
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