Mitsubishi Electric MELSERVO-J4 Instruction Manual page 65

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 51 Name: Overload 2
Alarm content
Detail
Detail name
No.
51.1 Thermal (1) The servo motor power
overload error
3 during
operation
(2) The connection of the
(3) The connection of the
(4) The torque is
(5) The servo amplifier is
(6) An encoder or servo
51.2 Thermal (1) A moving part collided
overload error 3
during a stop
(2) The servo motor power
(3) The connection of the
(4) The connection of the
(5) The torque is
(6) The servo amplifier is
(7) An encoder is
Maximum output current flowed continuously due to machine collision or the like.
Cause
Check the servo
cable was motor power cable.
disconnected.
Check the wiring of
servo motor is incorrect. U/V/W.
Check if the encoder
encoder cable is cable is connected
incorrect. correctly.
Check the peak load
insufficient. ratio.
Replace the servo
malfunctioning. amplifier, and then
check the
repeatability.
Replace the servo
motor is malfunctioning. motor, and then check
the repeatability.
Check if it collided.
against the machine.
Check it with the check method for [AL. 51.1].
cable was
disconnected.
servo motor is
incorrect.
encoder cable is
incorrect.
saturated.
malfunctioning.
malfunctioning.
Check method Check result
It is disconnected.
It is not
disconnected.
It is incorrect.
It is correct.
It is incorrect.
It is correct.
The torque is
saturated.
The torque is not
saturated.
It is not repeatable.
It is repeatable.
It is not repeatable.
It collided.
It did not collide.
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Action Target
Repair or replace [A]
the servo motor [B]
power cable. [WB]
[RJ010]
Check (2).
[GF]
Connect it correctly.
Check (3).
Connect it correctly.
Check (4).
Reduce the load or
review the operation
pattern. Or use a
larger capacity
motor.
Check (5).
Replace the servo
amplifier.
Check (6).
Replace the servo
motor.
Check operation
pattern.
Refer to (2).