Mitsubishi Electric MR-J4-10A(-RJ) Instruction Manual page 169

4. STARTUP
No. Start-up sequence
2 Switch on SON Alarm occurs.
(Servo-on).
Servo motor shaft is
not servo-locked.
(Servo motor shaft is
free.)
3 Input command Servo motor does not
pulse. rotate.
(Test operation)
Servo motor run in
reverse direction.
4 Gain adjustment Rotation ripples (speed
fluctuations) are large
at low speed.
Large load inertia
moment causes the
servo motor shaft to
oscillate side to side.
5 Cyclic operation Position shift occurs
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.
Fault Investigation
Refer to chapter 8 and remove cause.
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.
Check the cumulative command
pulse on the status display
(section 4.5.3).
Make gain adjustment in the
following procedure.
1. Increase the auto tuning
response level.
2. Repeat acceleration and
deceleration three times or more
to complete auto tuning.
If the servo motor may be run with
safety, repeat acceleration and
deceleration three times or more to
complete auto tuning.
Confirm the cumulative command
pulses, cumulative feedback
pulses and actual servo motor
position.
4 - 10
Possible cause
1. SON (Servo-on) is not input.
(wiring mistake)
2. 24 V DC power is not
supplied to DICOM.
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.
Mistake in setting of [Pr. PA13].
1. Mistake in wiring to controller.
2. Mistake in setting of [Pr.
PA14].
Gain adjustment fault
Gain adjustment fault
Pulse counting error, etc. due to
noise.
Reference
Chapter 8
(Note)
Section
4.5.7
Section
4.5.3
Chapter 5
Chapter 6
Chapter 6
(2) in
this
section