17 - 60
17. SPEED CONTROL OPERATION
17.9 Troubleshooting
17.9.1 Troubleshooting at start-up
CAUTION
Never make a drastic adjustment or change to the parameter values as
doing so will make the operation unstable.
POINT
Using MR Configurator, you can refer to the reason for rotation failure, etc.
The following faults may occur at start-up. If any of such faults occurs, take the corresponding action.
No. Occurrence stage
Fault
Investigation
Possible cause
Reference
1 Power
on
The 7-segment LED
display is not lit.
7-segment LED
display flickers.
Not improved if connectors CN6,
CN2 and CN3 are disconnected.
1. Power supply voltage fault
2. Servo amplifier is faulty.
Improved when connectors CN6 is
disconnected.
Power supply of CN6 cabling is
shorted.
Improved when connector CN2 is
disconnected.
1. Power supply of encoder
cabling is shorted.
2. Encoder is faulty.
Improved when connector CN3 is
disconnected.
Power supply of CN3 cabling is
shorted.
Alarm occurs.
Remove cause.
Section
17.9.4
2 Switch
on
servo-on
Alarm occurs.
Remove cause.
Section
17.9.4
Servo motor shaft is not
servo-locked
(is free).
1. Check the display to see if the
servo amplifier is ready to
operate.
2. Check the external I/O signal
indication to see if the servo-on
is on.
1. Servo-on is not on. (wiring
mistake)
2. Interface power supply
(24 V DC) is not supplied.
Section
8.5.4
3 Gain
adjustment 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 three or four
times to complete auto tuning.
Gain adjustment fault
Chapter 9
Large load inertia
moment causes the
servo motor shaft to
oscillate side to side.
If the servo motor can be driven
safely, repeat acceleration and
deceleration three or four times to
complete auto tuning.
Gain adjustment fault
Chapter 9
4
Cyclic operation
Position shift occurs
Confirm the command position,
current position, cumulative
feedback pulses and actual servo
motor position.
Pulse counting error, etc.
due to noise.
Содержание Melservo-J3 Series MR-J3-B
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