Troubleshooting; Troubleshooting At Start-Up - Mitsubishi Electric MELSERVO-J3 Series Instruction Manual

16. INDEXER POSITIONING OPERATION

16.12 Troubleshooting

16.12.1 Troubleshooting at start-up

CAUTION
The following faults may occur at start-up. If any of such faults occurs, take the corresponding action.
No. Occurring stage
1 Power on
2 Switch on servo-on Alarm occurs.
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 MR Configurator, you can refer to unrotated servo motor reasons,
etc.
Fault
Not improved if connectors
The 7-segment
CN6, CN2 and CN3 are
LED display is not lit.
disconnected.
7-segment LED
display flickers. Improved when connectors
CN6 is disconnected.
Improved when connector
CN2 is disconnected.
Improved when connector
CN3 is disconnected.
Alarm occurs. Remove cause.
Remove cause.
Servo motor shaft is 1. Check the display to see if
not servo-locked the servo amplifier is ready
(is free). to operate.
2. Check the external I/O
signal indication to see if
the servo-on is on.
Rotation ripples Make gain adjustment in the
(speed fluctuations) following procedure.
are large at low speed. 1. Increase the auto tuning
response level.
2. Repeat acceleration and
deceleration three or four
times to complete auto
tuning.
Large load inertia If the servo motor can be
moment causes the driven safely, repeat
servo motor shaft to acceleration and deceleration
oscillate side to side. three or four times to
complete auto tuning.
Position shift occurs Confirm the command
position, current position,
cumulative feedback pulses
and actual servo motor
position.
Investigation
1. Power supply voltage fault
2. Servo amplifier is faulty.
Power supply of CN6 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 is not switched on.
(Wiring mistake)
2. Interface power supply (24 V
DC) is not supplied.
Gain adjustment fault
Gain adjustment fault
Pulse counting error, etc.
due to noise.
16 - 102
Possible cause Reference
Section 8.5.4
Chapter 9
Chapter 9
Section
16.12.4
Section
16.12.4