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10. TROUBLESHOOTING
10.1.3 Torque control mode
No. Start-up sequence Fault Investigation Possible cause Refer to
Not improved if connectors
CN1A, CN1B, CN2 and CN3
are disconnected.
1. Power supply voltage fault
2. Servo amplifier is faulty.
Improved when connectors
CN1A and CN1B are
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
Alarm occurs. Refer to Section 10.2 and remove cause. Section 10.2
Alarm occurs. Refer to Section 10.2 and remove cause. Section 10.22 Switch on servo-on
signal.
Servo motor shaft is
free.
Call the external I/O signal
display and check the
ON/OFF status of the input
signal.
1. Servo-on signal is not input.
(Wiring mistake)
2. 24VDC power is not
supplied to COM.
Section 6.6
Call the status display and
check the analog torque
command (TC).
Analog torque command is 0V. Section 6.2
Call the external I/O signal
display and check the
ON/OFF status of the input
signal.
RS1 or RS2 is off. Section 6.6
Check the internal speed
limits 1 to 7
(parameters No. 8 to 10
72
to 75).
Set value is 0.
Check the analog torque
command maximum output
(parameter No. 26) value.
Torque command level is too
low as compared to the load
torque.
3Switch on forward
rotation start (RS1)
or reverse rotation
start (RS2).
Servo motor does
not rotate.
Check the internal torque
limit 1 (parameter No. 28).
Set value is 0.
(1),
Section 5.1.2