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10. TROUBLESHOOTING
10. TROUBLESHOOTING
10.1 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 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.
No. Start-up sequence Fault Investigation Possible cause Reference
1 Power on LED is not lit.
LED flickers.
Not improved if connectors
CN2, CN3, CN6 and CN10
are disconnected.
1. Power supply voltage fault
2. Servo amplifier is faulty.
Improved when connectors
CN6 and CN10 are
disconnected.
Power supply of CN6 and CN10
cabling are 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. Refer to section 10.2 and remove cause. Section 10.2
2 Switch on servo-on
(SON) signal.
The I/O signal does
not work to MR-J3-
D01.
Confirm whether numbers are
displayed in the last two digits
of the display LED after the
power-on.
If numbers are displayed in the
last two digits of LED, MR-J3-
D01 is disconnected from the
servo amplifier.
Install it correctly and confirm
that "—" is displayed in the last
two digits of the LED after the
power-on.
Alarm occurs. Refer to section 10.2 and remove cause. Section 10.2
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 (SON) signal
is ON.
1. Servo-on (SON) is not input.
(Wiring mistake)
2. 24VDC power is not supplied
to DICOM.
Section 7.5.4
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 several times
to complete auto tuning.
Gain adjustment fault Chapter 8
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 8