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15. MR-E- AG-QW003 SERVO AMPLIFIER COMPATIBLE WITH ANALOG INPUT
15.6. Troubleshooting
15.6.1 Trouble at start-up
The following faults may occur at start-up. If any of such faults occurs, take the corresponding action.
(1) Speed control mode
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 (Note)
Alarm occurs.
Refer to section 10.2 and remove cause.
Section 10.2
Alarm occurs.
Refer to section 10.2 and remove cause.
Section 10.2
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 to see if the
servo-on (SON) is ON.
1. Servo-on (SON) is not input.
(Wiring mistake)
2. 24VDC power is not supplied
to COM.
Section 6.6
Call the status display and
check the input voltage of the
analog speed command (VC).
Analog speed command is 0V.
Section 6.2
Call the external I/O signal
display and check the ON/OFF
status of the input signal.
LSP, LSN, ST1 or ST2 is off.
Section 6.6
Check the internal speed
commands 1 to 7
(parameters No.8 to 10 72 to
75).
Set value is 0.
Check the internal torque limit
1 (parameter No.28).
Torque limit level is too low as
compared to the load torque.
3
Switch on forward
rotation start (ST1) or
reverse rotation start
(ST2).
Servo motor does not
rotate.
When the analog torque limit
(TLA) is usable, check the
input voltage on the status
display.
Torque limit level is too low as
compared to the load torque.
Section
5.1.2 (1)
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
Note. Switch power on again after making sure that the change lamp has turned off completely.
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