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9. TROUBLESHOOTING
9.1.3 Torque control mode
No. Start-Up Sequence Fault Investigation Possible Cause Refer To
Not improved if connectors
CN1A, CN1B and CNP2 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.
x LED is not lit.
x LED flickers.
Improved when connector
CNP2 is disconnected.
1. Power supply of encoder
cabling is shorted.
2. Encoder is faulty.
1 Power on
Alarm occurs. Refer to Section 9.2 and remove cause. Section 9.2
Alarm occurs. Refer to Section 9.2 and remove cause. Section 9.22 Switch on servo-on
signal.
Servo motor shaft is
not servo-locked
(is free).
Check the display to see if
the servo amplifier is ready
to operate.
1. Servo on signal is not input.
(Wiring mistake)
2. 24VDC power is not
supplied to COM.
Section 6.3
Call the status display and
check the analog torque
command.
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 3
(parameters No. 8 to 10).
Set value is 0.
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