Speed Control Mode - Mitsubishi Electric MR-J2S-*A series Instruction Manual

10. TROUBLESHOOTING

10.1.2 Speed control mode

No. Start-up sequence
1 Power on
2 Switch on servo-on
signal.
3 Switch on forward
rotation start (ST1)
or reverse rotation
start (ST2).
4 Gain adjustment
Fault
LED is not lit. Not improved if connectors
LED flickers. CN1A, CN1B, CN2 and CN3
are disconnected.
Improved when connectors
CN1A and CN1B are
disconnected.
Improved when connector
CN2 is disconnected.
Improved when connector
CN3 is disconnected.
Alarm occurs. Refer to Section 10.2 and remove cause.
Alarm occurs. Refer to Section 10.2 and remove cause.
Servo motor shaft is 1. Check the display to see if
not servo-locked the servo amplifier is
(is free). ready to operate.
2. Check the external I/O
signal indication to see if
the servo-on (SON) signal
is ON.
Servo motor does Call the status display and
not rotate. check the input voltage of
the analog speed command
(VC).
Call the external I/O signal
display and check the
ON/OFF status of the input
signal.
Check the internal speed
commands 1 to 7
(parameters No. 8 to 10 72
to 75).
Check the internal torque
limit 1 (parameter No. 28).
When the analog torque
limit (TLA) is usable, check
the input voltage on the
status display.
Rotation ripples Make gain adjustment in the
(speed fluctuations) following procedure:
are large at low 1. Increase the auto tuning
speed.
2. Repeat acceleration and
Large load inertia If the servo motor may be
moment causes the run with safety, repeat
servo motor shaft to acceleration and
oscillate side to side. deceleration several times to
complete auto tuning.
Investigation
response level.
deceleration several
times to complete auto
tuning.
10 - 4
Possible cause
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.
Power supply of CN3 cabling is
shorted.
1. Servo-on signal is not input.
(Wiring mistake)
2. 24VDC power is not
supplied to COM.
Analog speed command is 0V.
LSP, LSN, ST1 or ST2 is off.
Set value is 0.
Torque limit level is too low as
compared to the load torque.
Torque limit level is too low as
compared to the load torque.
Gain adjustment fault
Gain adjustment fault
Refer to
Section 10.2
Section 10.2
Section 6.6
Section 6.2
Section 6.6
(1), Section
5.1.2
Chapter 7
Chapter 7