Mitsubishi Electric MELSERVO-JN Series Instruction Manual page 237

8. TROUBLESHOOTING
Alarm No.: A.51 Name: Overload 2
Description
Detailed Detailed
display Name
51.1 Overload 1) Power cables breakage
thermal 3
error during
operation
2) Incorrect connection with
3) Incorrect connection of the
4) The work collided against
5) Torque is saturated.
6) Servo amplifier fault
7) Encoder faulty.
51.2 Overload 1) Power cables breakage
thermal 3
2) Incorrect connection with
error at a
stop
3) Incorrect connection of the
4) The work collided against
5) Torque is saturated.
6) Servo amplifier fault
7) Encoder faulty.
Machine collision or the like caused continuous flow of the maximum output current for a few seconds.
Cause
the servo motor
encoder cable
the structural part.
the servo motor
encoder cable
the structural part.
Checking method
Check the power An error is found.
cables.
No error.
Check the wiring of U, An error is found.
V and W.
No error.
Check if the encoder An error is found.
cable is connected
correctly.
No error.
Check if the work Collided.
collided against the
structural part.
Did not collide.
Check the torque Torque is saturated. Check the operation
during the operation.
Torque is not
saturated.
Check if the alarm Alarm does not
occurs after replacing occur.
the servo amplifier.
Alarm occurs.
Check if the alarm Alarm does not
occurs after replacing occur.
the servo motor.
Execute the checking methods mentioned in the alarm display "51.1".
8 - 20
Result Action
Repair the power cables.
Check 2).
Wire correctly.
Check 3).
Correct the connection.
Check 4).
Check the operation
pattern.
Check 5).
pattern.
Check 6).
Replace the servo
amplifier.
Check 7).
Replace the servo motor.