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8. TROUBLESHOOTING
8-1-2 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
• LED flickers.
connectors CN1A, CN1B
and CN2 are disconnected.
Improved when
connectors CN1A and
CN1B are disconnected.
Improved when connector
CN2 is disconnected.
Alarm occurs.
Refer to Section 8-2 and remove cause.
Alarm occurs.
Refer to Section 8-2 and remove cause.
Servo motor shaft is
1. Check the display to see
free.
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.
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).
Rotational ripples
Make gain adjustment in
(speed fluctuations)
the 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
moment causes the
the following procedure:
servo motor 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 faulty.
Power supply of CN1
cabling is shorted.
1) Power supply of
encoder cabling is
shorted.
2) Encoder is faulty.
(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
8– 4
Possible Cause
Refer To
Section 8-2
Section 8-2
(1), Section 2-3-3
Section 2-3-2
(1), Section 2-3-3
(3), Section 2-3-5
Section 2-4
Section 2-4
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