4 - 7
4. STARTUP
4.2.6 Trouble at start-up
CAUTION
Excessive adjustment or change of parameter setting must not be made as it will
make operation instable.
POINT
Using the optional MR Configurator, you can refer to unrotated servo motor
reasons, etc.
The following faults may occur at start-up. If any of such faults occurs, take the corresponding action.
(1) Troubleshooting
No. Start-up
sequence
Fault
Investigation
Possible
cause
Reference
Not improved if connectors CN1,
CN2 and CN3 are disconnected.
1. Power supply voltage fault
2. Servo amplifier is faulty.
Improved when connectors CN1 is
disconnected.
Power supply of CN1 cabling is
shorted.
Improved when connector CN2 is
disconnected.
1. Power supply of encoder
cabling is shorted.
2. Encoder is faulty.
LED is not lit.
LED flickers.
Improved when connector CN3 is
disconnected.
Power supply of CN3 cabling is
shorted.
1 Power
on
Alarm occurs.
Refer to chapter 9 and remove cause.
Chapter 9
Alarm occurs.
Refer to chapter 9 and remove cause.
Chapter 9
2 Switch
on
servo-on
(SON).
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 (section 6.7) to see if
the servo-on (SON) is ON.
1. Servo-on (SON) is not input.
(Wiring mistake)
2. External 24VDC power is not
supplied to DICOM.
Section 6.7
Servo motor does
not rotate.
1. Wiring mistake
(a) For open collector pulse
train input, 24VDC power is
not supplied to OPC.
(b) LSP and LSN are not on.
2. No pulses is input.
Section 6.3
3
Enter input
command.
(Test operation)
Servo motor run in
reverse direction.
Check cumulative command
pulses for the status display
(section 6.3).
1. Mistake in wiring to controller.
2. Mistake in setting of parameter
No. PA14.
Chapter 5
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 7
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 7
5
Cyclic operation
Position shift occurs Confirm the cumulative command
pulses, cumulative feedback
pulses and actual servo motor
position.
Pulse counting error, etc.
due to noise.
(2) in this
section
Содержание MELSERVO MR-J3 A Series
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