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9. TROUBLESHOOTING
9.1.2
Speed control mode
No.
Start-Up Sequence
1
Power on
2
Switch on servo-on
signal.
3
Switch on forward
rotation start (ST1)
or reverse rotation
start (ST2).
4
Gain adjustment
Fault
LED is not lit.
Not improved if connectors
LED flickers.
CN1A, CN1B and CNP2 are
disconnected.
Improved when connectors
CN1A and CN1B are
disconnected.
Improved when connector
CNP2 is disconnected.
Alarm occurs.
Refer to Section 9.2 and remove cause.
Alarm occurs.
Refer to Section 9.2 and remove cause.
Servo motor shaft is
Check the display to see if
not servo-locked
the servo amplifier is ready
(is free).
to operate.
Servo motor does
Call the status display and
not rotate.
check the input voltage of
the analog speed command.
Call the external I/O signal
display and check the
ON/OFF status of the input
signal.
Check the internal speed
commands 1 to 3
(parameters No. 8 to 10).
Check the internal torque
limit 1 (parameter No. 28).
Rotation ripples
Make gain adjustment in the
(speed fluctuations)
following procedure:
are large at low
1. Increase the auto tuning
speed.
response level.
2. Repeat acceleration and
deceleration several
times to complete auto
tuning.
Large load inertia
Make gain adjustment in the
moment causes the
following procedure:
servo motor shaft to
If the servo motor may be
oscillate side to side.
run with safety, repeat
acceleration and
deceleration several times
to complete auto tuning.
Investigation
1. Power supply voltage fault
2. Servo amplifier is faulty.
Power supply of CN1 cabling is
shorted.
1. Power supply of encoder
cabling is shorted.
2. Encoder is faulty.
1. Servo on signal is not input.
(Wiring mistake)
2. 24VDC power is not
supplied to COM.
Analog speed command is 0V.
LSP, LSN, ST1 or ST2 is off.
Set value is 0.
Set value is 0.
Gain adjustment fault
Gain adjustment fault
9 - 4
Possible Cause
Section 9.2
Section 9.2
Section 6.3
Section 6.2
Section 6.6
(1), Section
Refer To
5.1.2
Chapter 7
Chapter 7
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