[Al. 032_Overcurrent] - Mitsubishi Electric MR-J5-G Series User Manual

[AL. 032_Overcurrent]

• A current higher than the permissible current flowed in the servo amplifier.
[AL. 032.1_Overcurrent detected via hardware detection circuit (during operation)]
Cause
1.
The servo amplifier has malfunctioned.
2.
The servo motor power cable has a ground
fault or has shorted.
3.
The servo motor has malfunctioned.
4.
The dynamic brake has malfunctioned.
5.
The wiring of the regenerative resistor
(regenerative option) is incorrect.
6.
The regenerative resistor (regenerative option)
and the servo amplifier are connected in a
wrong combination.
7.
The connection destination of the servo motor
power cable or the encoder cable is incorrect.
8.
There is a problem with the surrounding
environment.
[AL. 032.2_Overcurrent detected via software detection processing (during operation)]
Cause
1.
The servo gain is too high.
2.
The servo amplifier has malfunctioned.
3.
The servo motor power cable has a ground
fault or has shorted.
4.
The servo motor has malfunctioned.
5.
The connection destination of the servo motor
power cable or the encoder cable is incorrect.
6.
There is a problem with the surrounding
environment.
1 SERVO AMPLIFIER TROUBLESHOOTING
52
1.3 Handling methods for alarms/warnings
Check/action method
Check if the servo motor power cable has a ground fault. If the servo motor
power cable has a ground fault, correct the wiring.
Check that this alarm occurs as the servo motor power cables (U/V/W) are
disconnected.
If the alarm occurs, replace the servo amplifier.
Check if the servo motor power cable has shorted.
If the servo motor power cable has shorted, replace the servo motor power
cable.
After disconnecting the servo motor power cables on the servo motor side,
check the insulation between phases (U/V/W/
If the servo motor has a ground fault or has shorted, replace the servo motor.
After confirming that the Cause 1, 2, and 3 did not apply, check if this alarm
occurs when turning on the servo-on command.
If the alarm occurs, replace the servo amplifier.
If the alarm does not occur, check 5.
Check if the regenerative resistor (regenerative option) is wired correctly. If the
regenerative resistor (regenerative option) is wired incorrectly, correct the
wiring.
Check if the combination of the regenerative resistor (regenerative option) and
the servo amplifier is correct as specified.
Refer to "Regenerative option" in the following manual.
MR-J5 User's Manual (Hardware)
Check the connection destination of the motor power cable or encoder cable.
Refer to "Example power circuit connections" in the following manual.
MR-J5 User's Manual (Hardware)
Check the noise, ambient temperature, and other conditions, and implement
appropriate countermeasures for the cause.
If a problem is not found with the surrounding environment, carry out the
check/action method for [AL. 045.1].
If there is noise, take countermeasures to reduce the noise.
Refer to "Noise reduction techniques" in the following manual.
MR-J5 User's Manual (Hardware)
Check/action method
Check if there is vibration.
If there is vibration, reduce the value in [Pr. PB09 Speed control gain].
Check that this alarm occurs as the servo motor power cables (U/V/W) are
disconnected.
If the alarm occurs, replace the servo amplifier.
Check if the servo motor power cable has a ground fault. If the servo motor
power cable has a ground fault, correct the wiring.
Check if the servo motor power cable has shorted.
If the servo motor power cable has shorted, replace the servo motor power
cable.
After disconnecting the servo motor power cables on the servo motor side,
check the insulation between phases (U/V/W/
has a ground fault or has shorted, replace the servo motor.
Check the connection destination of the motor power cable or encoder cable.
Refer to "Example power circuit connections" in the following manual.
MR-J5 User's Manual (Hardware)
Check the noise, ambient temperature, and other conditions, and implement
appropriate countermeasures for the cause.
If there is noise, take countermeasures to reduce the noise.
Refer to "Noise reduction techniques" in the following manual.
MR-J5 User's Manual (Hardware)
Model
[A]
[G]
[WG]
or ).
Model
[A]
[G]
[WG]
or ). If the servo motor