Mitsubishi Electric MELSERVO-JN Series, Instruction Manual

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8. TROUBLESHOOTING
Alarm No.: A.51 Name: Overload 2
Description Machine collision or the like caused continuous flow of the maximum output current for a few seconds.
Detailed
display
Detailed
Name
Cause Checking method Result Action
51.1 Overload
thermal 3
error during
operation 1) Power cables breakage Check the power
cables. An error is found. Repair the power cables.
No error. Check 2).
2) Incorrect connection with
the servo motor
Check the wiring of U,
V and W. An error is found. Wire correctly.
No error. Check 3).
3) Incorrect connection of the
encoder cable
Check if the encoder
cable is connected
correctly. An error is found. Correct the connection.
No error. Check 4).
4) The work collided against
the structural part.
Check if the work
collided against the
structural part. Collided. Check the operation
pattern.
Did not collide. Check 5).
5) Torque is saturated. Check the torque
during the operation. Torque is saturated. Check the operation
pattern.
Torque is not
saturated. Check 6).
6) Servo amplifier fault Check if the alarm
occurs after replacing
the servo amplifier. Alarm does not
occur. Replace the servo
amplifier.
Alarm occurs. Check 7).
7) Encoder faulty. Check if the alarm
occurs after replacing
the servo motor. Alarm does not
occur. Replace the servo motor.
51.2 Overload
thermal 3
error at a
stop 1) Power cables breakage Execute the checking methods mentioned in the alarm display "51.1".
2) Incorrect connection with
the servo motor
3) Incorrect connection of the
encoder cable
4) The work collided against
the structural part.
5) Torque is saturated.
6) Servo amplifier fault
7) Encoder faulty.