Mitsubishi MR-J4-70A User Manual

4. STARTUP
4 - 15
No. Start-up sequence Fault Investigation Possible cause Reference
2 Alarm occurs. Refer to chapter 8 and remove cause. Chapter 8
(Note)
Switch on SON
(Servo-on).
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
Call the status display (section
4.5.3) and check the input
voltage of VC (Analog speed
command).
Analog speed command is 0 V. Section
4.5.3
Call the external I/O signal
display (section 4.5.7) and check
the on/off status of the input
signal.
LSP, LSN, ST1, and ST2 are off. Section
4.5.7
Check the internal speed
commands 1 to 7 ([Pr. PC05] to
[Pr. PC11]).
Set value is 0. Section
5.2.3
Check the forward rotation
torque limit ([Pr. PA11]) and the
reverse rotation torque limit ([Pr.
PA12]).
Torque limit level is too low as
compared to the load torque.
Section
5.2.1
3 Switch on ST1
(Forward rotation
start) or ST2
(Reverse rotation
start).
Servo motor does not
rotate.
When TLA (Analog torque limit)
is usable, check the input voltage
on the status display.
Torque limit level is too low as
compared to the load torque.
Section
4.5.3
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
4 Gain adjustment
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
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.

Mitsubishi MR-J4-70A Specifications

General

Brand	Mitsubishi
Model	MR-J4-70A
Category	Amplifier
Language	English