Mitsubishi Electric MELSERVO-J4 Instruction Manual Trouble Shooting page 46

1. TROUBLESHOOTING
Alarm No.: 50 Name: Overload 1
Alarm content
Detail
Detail name
No.
50.4 Thermal (1) A moving part collided
overload error 1
during a stop
(2) The servo motor power
(3) Hunting occurs during
(4)
(5)
(6)
(7)
(8) The servo amplifier is
(9) The encoder or liner
50.5 Thermal Check it with the check method for [AL. 50.4].
overload error 2
during a stop
50.6 Thermal
overload error 4
during a stop
Load exceeded overload protection characteristic of servo amplifier.
Cause
Check if it collided.
against the machine.
Check the servo motor
cable was power cable.
disconnected.
Check if the hunting is
servo-lock. occurring.
The electromagnetic Check if the
brake has not released. electromagnetic brake
(The electromagnetic is released.
brake has been
activated.)
A current was applied to Check the effective
the servo amplifier in load ratio.
excess of its continuous
output current.
The connection Check the connection
destination of the destinations of CN2A,
encoder cable is CN2B, and CN2C.
incorrect.
The servo system is Check if it is
unstable and resonating.
resonating.
Replace the servo
malfunctioning. amplifier, and then
check the
repeatability.
Replace the servo
encoder is motor or linear
malfunctioning. encoder, and then
check the
repeatability.
Check method Check result
It collided.
It did not collide.
It is disconnected.
It is not disconnected. Check (3).
The hunting is
occurring.
The hunting is not
occurring.
It is not released.
It is released.
The effective load
ratio is high.
The effective load
ratio is small.
It is not correct.
It is correct.
It is resonating.
It is not resonating.
It is not repeatable.
It is repeatable.
It is not repeatable.
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Action Target
Check operation [A]
pattern. [B]
[WB]
Check (2).
[RJ010]
Repair or replace the
servo motor power
cable.
Adjust gains.
Check (4).
Release the
electromagnetic
brake.
Check (5).
Reduce the load. Or
use a larger capacity
motor.
Check (6).
Connect it correctly. [WB]
Check (7).
Adjust gains. [A]
[B]
Check (8).
[WB]
[RJ010]
Replace the servo
amplifier.
Check (9).
Replace the servo
motor or linear
encoder.