Справочник Пользователя для Mitsubishi Electronics MR-E- A/AG
15 - 59
15. MR-E- AG SERVO AMPLIFIER COMPATIBLE WITH ANALOG INPUT
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
(1) Speed control mode
No.
Start-up sequence
Fault
Investigation
Possible cause
Reference
Not improved if connectors
CN1, CN2 and CN3 are
disconnected.
CN1, CN2 and CN3 are
disconnected.
1. Power supply voltage fault
2. Servo amplifier is faulty.
2. Servo amplifier is faulty.
Improved when connectors
CN1 is disconnected.
CN1 is disconnected.
Power supply of CN1 cabling is
shorted.
shorted.
Improved when connector
CN2 is disconnected.
CN2 is disconnected.
1. Power supply of encoder
cabling is shorted.
2. Encoder is faulty.
LED is not lit.
LED flickers.
LED flickers.
Improved when connector
CN3 is disconnected.
CN3 is disconnected.
Power supply of CN3 cabling is
shorted.
shorted.
1
Power on (Note)
Alarm occurs.
Refer to Section 10.2 and remove cause.
Section 10.2
Alarm occurs.
Refer to Section 10.2 and remove cause.
Section 10.2
2
Switch on servo-on
(SON).
(SON).
Servo motor shaft is
not servo-locked
(is free).
not servo-locked
(is free).
1. Check the display to see if
the servo amplifier is
ready to operate.
ready to operate.
2. Check the external I/O
signal indication to see if
the servo-on (SON) is ON.
the servo-on (SON) is ON.
1. Servo-on (SON) is not input.
(Wiring mistake)
2. 24VDC power is not
supplied to COM.
Section 6.6
Call the status display and
check the input voltage of
the analog speed command
(VC).
check the input voltage of
the analog speed command
(VC).
Analog speed command is 0V.
Section 6.2
Call the external I/O signal
display and check the
ON/OFF status of the input
signal.
display and check the
ON/OFF status of the input
signal.
LSP, LSN, ST1 or ST2 is off.
Section 6.6
Check the internal speed
commands 1 to 7
(parameters No. 8 to 10 72
to 75).
commands 1 to 7
(parameters No. 8 to 10 72
to 75).
Set value is 0.
Check the internal torque
limit 1 (parameter No. 28).
limit 1 (parameter No. 28).
Torque limit level is too low as
compared to the load torque.
compared to the load torque.
3
Switch on forward
rotation start (ST1)
or reverse rotation
start (ST2).
rotation start (ST1)
or reverse rotation
start (ST2).
Servo motor does
not rotate.
not rotate.
When the analog torque
limit (TLA) is usable, check
the input voltage on the
status display.
limit (TLA) is usable, check
the input voltage on the
status display.
Torque limit level is too low as
compared to the load torque.
compared to the load torque.
(1), Section
5.1.2
Rotation ripples
(speed fluctuations)
are large at low
speed.
(speed fluctuations)
are large at low
speed.
Make gain adjustment in the
following procedure:
following procedure:
1. Increase the auto tuning
response level.
2. Repeat acceleration and
deceleration several
times to complete auto
tuning.
times to complete auto
tuning.
Gain adjustment fault
Chapter 7
4
Gain adjustment
Large load inertia
moment causes the
servo motor shaft to
oscillate side to side.
moment causes the
servo motor shaft to
oscillate side to side.
If the servo motor may be
run with safety, repeat
acceleration and
deceleration several times to
complete auto tuning.
run with safety, repeat
acceleration and
deceleration several times to
complete auto tuning.
Gain adjustment fault
Chapter 7
Note: Switch power on again after making sure that the change lamp has turned off completely.