Mitsubishi Electric MELSERVO-J4 Instruction Manual page 50

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 31 Name: Overspeed
Alarm content
Detail
Detail name
No.
31.1 Abnormal (8) For MR-J4-03A6(-RJ)
motor speed
(9) The connection
(10) The connection of the
(11) The encoder or linear
Alarm No.: 32 Name: Overcurrent
Alarm content
Detail
Detail name
No.
32.1 Overcurrent (1) The servo amplifier is
detected at
hardware
detection circuit
(during
(2) A ground fault or short
operation)
(3) The servo motor is
(4) The dynamic brake is
(5) The connection
(6) Something near the
The servo motor seed has exceeded the permissible instantaneous speed.
The linear servo motor seed has exceeded the permissible instantaneous speed.
Cause
Check if a bus voltage
and MR-J4W2-0303B6, drops temporarily
the speed has overshot during an operation.
when the power was
restored from a
temporary bus voltage
drop during an
operation.
Check the connection
destination of the destinations of CN2A,
encoder cable is CN2B, and CN2C.
incorrect.
Check the wiring of
servo motor is incorrect. U/V/W.
Check if the alarm is
encoder is occurring during less
malfunctioning. than permissible
instantaneous speed.
A current higher than the permissible current was applied to the servo amplifier.
Cause
Disconnect the servo
malfunctioning. motor power cables
(U/V/W) and check if
the alarm occurs.
Check if only the
occurred at the servo servo motor power
motor power cable. cable is shorted.
Disconnect the servo
malfunctioning. motor power cables
on motor side, and
check insulation of
the motor (between
U/V/W/ /
Check if the alarm
malfunctioning. occurs when you turn
on the servo-on
command.
Check the connection
destination of the destinations of CN2A,
encoder cable is CN2B, and CN2C.
incorrect.
Check the noise,
device caused it. ambient temperature,
etc.
Check method Check result
The bus voltage has
dropped.
The bus voltage has
not dropped.
It is not correct.
It is correct.
It is incorrect.
It is correct.
It is occurring during
less than permissible
instantaneous
speed.
Check method Check result
It occurs.
It does not occur.
It is shorted.
It is not shorted.
A ground fault is
occurring.
A ground fault is not
occurring.
).
It occurs.
It does not occur.
It is not correct.
It is correct.
It has a failure.
1 - 43
Action Target
Review the capacity [A]
of the 24 V DC main [WB]
circuit power supply.
Increase the voltage
of the 24 V DC main
circuit power supply
within the
permissible voltage
fluctuation range.
Change the main
circuit input voltage
to 48 V DC. Check
operation pattern.
Check (9).
Wire it correctly. [WB]
Check (10).
Set it correctly. [A]
[B]
Check (11).
[WB]
Replace the servo
[RJ010]
motor or linear
[GF]
encoder.
Action Target
Replace the servo [A]
amplifier. [B]
[WB]
Check (2).
[RJ010]
[GF]
Replace the servo
motor power cable.
Check (3).
Replace the servo
motor.
Check (4).
Replace the servo
amplifier.
[WB]: Check (5).
[A] [B] [RJ010] [GF]:
Check (7).
Wire it correctly. [WB]
Check (6).
Take
countermeasures
against its cause.