Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 106

6. TROUBLESHOOTING
Display Name
50 Overload1
51 Overload2
Definition
Load exceeded 1. Servo amplifier is used in excess of
overload protection its continuous output current.
characteristic of servo
amplifier.
2. Servo system is instable and
hunting.
3. Machine struck something.
4. Wrong connection of direct drive
motor. Servo amplifier's power
supply output (U, V, and W) do not
match direct drive motor's power
supply input (U, V, and W).
5. Encoder faulty.
When the direct drive motor rotor
is rotated with the servo-off, the
cumulative feedback pulses do
not vary in proportional to the
turning angle in the rotor, and the
indication skips or returns
midway.
6. Initial magnetic pole detection has
not been performed.
7. After Overload 2 (51) occurred, turn
off/on the power supply to clear the
alarm. Then the overload operation
is repeated.
Machine collision or 1. Machine struck something.
the like caused max.
output current to flow
2. Wrong connection of direct drive
successively for
motor. Servo amplifier's power
several seconds.
supply output (U, V, and W) do not
For the time of the
match direct drive motor's power
alarm occurrence,
supply input (U, V, and W).
refer to the section
3. Servo system is instable and
8.1.
hunting.
4. Encoder faulty.
When the direct drive motor rotor
is rotated with the servo-off, the
cumulative feedback pulses do
not vary in proportional to the
turning angle in the rotor, and the
indication skips or returns
midway.
5. Initial magnetic pole detection has
not been performed.
Cause
Checking method
Checking method
6 - 5
Action
1. Reduce load.
2. Check operation pattern.
3. Replace direct drive motor that provides
larger output.
1. Repeat acceleration/
deceleration to execute auto tuning.
2. Change auto tuning response setting.
3. Set auto tuning to off and make gain
adjustment manually.
1. Check operation pattern.
2. Install limit switches.
Connect correctly.
Replace the direct drive motor.
Perform initial magnetic pole detection.
1. Reduce load.
2. Check operation pattern.
3. Replace direct drive motor that provides
larger output.
1. Check operation pattern.
2. Install limit switches.
Connect correctly.
1. Repeat acceleration/deceleration to
execute auto tuning.
2. Change auto tuning response setting.
3. Set auto tuning to off and make gain
adjustment manually.
Replace the direct drive motor.
Perform initial magnetic pole detection.