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

11. TROUBLESHOOTING

11. TROUBLESHOOTING

11.1 Troubleshooting at start-up

CAUTION
The following faults may occur at start-up. If any of such faults occurs, take the corresponding action.
No. Occurrence stage
1 Power on
2 Switch on servo-on
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 MR Configurator, you can refer to unrotated servo motor reasons,
etc.
Fault
7-segment LED is Not improved if connectors
not lit. CN2, CN3 and CN6 are
7-segment LED disconnected.
flickers.
Improved when connector
CN6 is disconnected.
Improved when connector
CN2 is disconnected.
Improved when connector
CN3 is disconnected.
Alarm occurs. Remove cause.
Alarm occurs. 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 signal is ON.
Rotation ripples Make gain adjustment in the
(speed fluctuations) following procedure.
are large at low 1. Increase the auto tuning
response level.
speed.
2. Repeat acceleration and
deceleration several times
to complete auto tuning.
Large load inertia If it is safe to run the servo
moment causes the motor, repeat acceleration
servo motor shaft to and deceleration several
oscillate side to side. 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 on. (Wiring
mistake)
2. Interface power supply
(24VDC) is not supplied.
Gain adjustment fault
Gain adjustment fault
Communication command fault,
slipping of machines, etc.
11 - 1
Possible cause Reference
Section 14.4
Section 14.4
Section 8.5.4
Chapter 9
Chapter 9