Mitsubishi Electric MR-J4-10A(-RJ) Instruction Manual page 175

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 Switch on ST1 Servo motor does not
(Forward rotation rotate.
start) or ST2
(Reverse rotation
start).
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.
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.
Call the status display (section
4.5.3) and check the input
voltage of VC (Analog speed
command).
Call the external I/O signal
display (section 4.5.7) and check
the on/off status of the input
signal.
Check the internal speed
commands 1 to 7 ([Pr. PC05] to
[Pr. PC11]).
Check the forward rotation
torque limit ([Pr. PA11]) and the
reverse rotation torque limit ([Pr.
PA12]).
When TLA (Analog torque limit)
is usable, check the input voltage
on the status display.
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.
4 - 16
Possible cause
1. SON (Servo-on) is not input.
(wiring mistake)
2. 24 V DC power is not supplied
to DICOM.
Analog speed command is 0 V.
LSP, LSN, ST1, and ST2 are off.
Set value is 0.
Torque limit level is too low as
compared to the load torque.
Torque limit level is too low as
compared to the load torque.
Gain adjustment fault
Gain adjustment fault
Reference
Chapter 8
(Note)
Section
4.5.7
Section
4.5.3
Section
4.5.7
Section
5.2.3
Section
5.2.1
Section
4.5.3
Chapter 6
Chapter 6