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8. TROUBLESHOOTING
8-1-3 Torque control mode
No. Start-Up Sequence
1
Power on
• LED is not lit.
• LED flickers.
Alarm occurs.
2
Switch on servo-on
Alarm occurs.
signal.
3
Switch on forward
Servo motor does
rotation start (RS1)
not rotate.
or reverse rotation
start (RS2).
Fault
Investigation
Not improved if connectors
CN1A, CN1B and CN2 are
disconnected.
Improved when connectors
CN1A and CN1B are
disconnected.
Improved when connector
CN2 is disconnected.
Refer to Section 8-2 and remove cause.
Refer to Section 8-2 and remove cause.
Call the status display
and check the analog
torque command.
Call the external I/O signal
display and check the
ON/OFF status of the input
signal.
Check the internal speed
limits 1 to 3
(parameters No. 8 to 10).
Check the internal torque
limit 1 (parameter No. 28).
8– 5
Possible Cause
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.
Analog torque command
Section 2-3-2
is 0V.
RS1 or RS2 is off.
(1), Section 2-3-3
Set value is 0.
(3), Section 2-3-5
Set value is 0.
Refer To
Section 8-2
Section 8-2
8
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