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