Troubleshooting; Trouble At Start-Up - Mitsubishi Electric MELSERVO-J2-Super Series Instruction Manual

12. TROUBLESHOOTING

12. TROUBLESHOOTING

12.1 Trouble at start-up

CAUTION
The following faults may occur at start-up. If any of such faults occurs, take the corresponding action.
No. Start-up sequence
1 Power on
2 Switch on servo-on
(RYn0) signal.
3 Gain adjustment
4 Cyclic operation
Excessive adjustment or change of parameter setting must not be made as it will
make operation instable.
POINT
Using the optional servo configuration software, you can refer to unrotated
servo motor reasons, etc.
Fault
LED is not lit. Not improved if connectors
LED flickers. CN1A, CN1B, CN2 and CN3
are 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 12.4 and remove cause.
Alarm occurs. Refer to Section 12.4 and remove cause.
Servo motor shaft is 1. Check the display to see if
not servo-locked the servo amplifier is
(is free). ready to operate.
2. Check the external I/O
signal indication to see if
the servo-on (RYn0)
signal is ON.
Rotation ripples Make gain adjustment in the
(speed fluctuations) following procedure:
are large at low 1. Increase the auto tuning
speed. response level.
2. Repeat acceleration and
deceleration several times
to complete auto tuning.
Large load inertia If the servo motor may be
moment causes the run with safety, repeat
servo motor shaft to acceleration and
oscillate side to side. deceleration several times to
complete auto tuning.
Position shift occurs Confirm the cumulative
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
cabling is shorted.
2. Encoder is faulty.
Power supply of CN3 cabling is
shorted.
1. Servo-on (RYn0) is not
input. (Wiring mistake)
2. 24VDC power is not
supplied to COM.
Gain adjustment fault
Gain adjustment fault
Pulse counting error, etc.
due to noise.
12 - 1
Possible cause Reference
Section 12.4
Section 12.4
Section 8.3.2
Chapter 9
Chapter 9