Mitsubishi Electric MR-E A Series Instruction Manual page 304

15. MR-E-
15.6. Troubleshooting
15.6.1 Trouble at start-up
The following faults may occur at start-up. If any of such faults occurs, take the corresponding action.
(1) Speed control mode
No. Start-up sequence
1 Power on (Note)
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2 Switch on servo-on
(SON).
3 Switch on forward
rotation start (ST1)
or reverse rotation
start (ST2).
4 Gain adjustment
Note: Switch power on again after making sure that the change lamp has turned off completely.
AG SERVO AMPLIFIER COMPATIBLE WITH ANALOG INPUT
Fault
LED is not lit.
LED flickers.
Alarm occurs.
Alarm occurs.
Servo motor shaft is
not servo-locked
(is free).
Servo motor does
not rotate.
Rotation ripples
(speed fluctuations)
are large at low
speed.
Large load inertia
moment causes the
servo motor shaft to
oscillate side to side.
Investigation
Not improved if connectors
CN1, CN2 and CN3 are
disconnected.
Improved when connectors
CN1 is disconnected.
Improved when connector
CN2 is disconnected.
Improved when connector
CN3 is disconnected.
Refer to Section 10.2 and remove cause.
Refer to Section 10.2 and remove cause.
1. Check the display to see if
the servo amplifier is
ready to operate.
2. Check the external I/O
signal indication to see if
the servo-on (SON) is ON.
Call the status display and
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.
Make gain adjustment in the
following procedure:
1. Increase the auto tuning
response level.
2. Repeat acceleration and
deceleration several
times to complete auto
tuning.
If the servo motor may be
run with safety, repeat
acceleration and
deceleration several times to
complete auto tuning.
15 - 59
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 (SON) 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
Reference
Section 10.2
Section 10.2
Section 6.6
Section 6.2
Section 6.6
(1), Section
5.1.2
Chapter 7
Chapter 7