Torque Control Mode - Mitsubishi Electric Melservo-J2-JR SERIES Instruction Manual

9. TROUBLESHOOTING
9.1.3

Torque control mode

No. Start-Up Sequence
1 Power on
2 Switch on servo-on
signal.
3 Switch on forward
rotation start (RS1)
or reverse rotation
start (RS2).
Fault
LED is not lit. Not improved if connectors
LED flickers. CN1A, CN1B and CNP2 are
disconnected.
Improved when connectors
CN1A and CN1B are
disconnected.
Improved when connector
CNP2 is disconnected.
Alarm occurs. Refer to Section 9.2 and remove cause.
Alarm occurs. Refer to Section 9.2 and remove cause.
Servo motor shaft is Check the display to see if
not servo-locked the servo amplifier is ready
(is free). to operate.
Servo motor does Call the status display and
not rotate. 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).
Investigation
1. Power supply voltage fault
2. Servo amplifier is faulty.
Power supply of CN1 cabling is
shorted.
1. Power supply of encoder
cabling is shorted.
2. Encoder is faulty.
1. Servo on signal is not input.
(Wiring mistake)
2. 24VDC power is not
supplied to COM.
Analog torque command is 0V.
RS1 or RS2 is off.
Set value is 0.
Set value is 0.
9 - 5
Possible Cause
Section 9.2
Section 9.2
Section 6.3
Section 6.2
Section 6.6
Section 5.1.2
Refer To
(1),