4. STARTUP
4 - 10
No. Start-up sequence Fault Investigation Possible cause Reference
2 Switch on SON
(Servo-on).
Alarm occurs. Refer to chapter 8 and remove cause. Chapter 8
(Note)
Servo motor shaft is
not servo-locked.
(Servo motor shaft is
free.)
1. Check the display to see if the
servo amplifier is ready to
operate.
2. Check the external I/O signal
indication (section 4.5.7) to see
if SON (Servo-on) is on.
1. SON (Servo-on) is not input.
(wiring mistake)
2. 24 V DC power is not
supplied to DICOM.
Section
4.5.7
3 Input command
pulse.
(Test operation)
Servo motor does not
rotate.
Check the cumulative command
pulse on the status display
(section 4.5.3).
1. Wiring mistake
(a) For open collector pulse
train input, 24 V DC power
is not supplied to OPC.
(b) LSP and LSN are not on.
2. Pulse is not input from the
controller.
Section
4.5.3
Mistake in setting of [Pr. PA13].
Servo motor run in
reverse direction.
1. Mistake in wiring to controller.
2. Mistake in setting of [Pr.
PA14].
Chapter 5
4 Gain adjustment Rotation ripples (speed
fluctuations) are large
at low speed.
Make gain adjustment in the
following procedure.
1. Increase the auto tuning
response level.
2. Repeat acceleration and
deceleration several times to
complete auto tuning.
Gain adjustment fault Chapter 6
Large load inertia
moment causes the
servo motor shaft to
oscillate side to side.
If the servo motor may be run with
safety, repeat acceleration and
deceleration several times to
complete auto tuning.
Gain adjustment fault Chapter 6
5 Cyclic operation Position shift occurs Confirm the cumulative command
pulses, cumulative feedback
pulses and actual servo motor
position.
Pulse counting error, etc. due to
noise.
(2) in this
section
Note. Only a list of alarms and warnings is listed in chapter 8. Refer to "MELSERVO-J4 Servo Amplifier Instruction Manual
(Troubleshooting)" for details of alarms and warnings.
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