Mitsubishi Electric MELSERVO-J3 Series Manual page 627

16. INDEXER POSITIONING OPERATION
Display Name
A50 Overload 1
A51 Overload 2
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 servo motor.
Servo amplifier's output terminals U,
V, W do not match servo motor's
input terminals U, V, W.
5. Encoder faulty.
When the servo motor shaft is
rotated with the servo off, the
cumulative feedback pulses do not
vary in proportion to the rotary angle
of the shaft but the indication skips
or returns midway.
6. After Overload 2 (A51) 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.
For the time of the
2. Wrong connection of servo motor.
alarm occurrence,
Servo amplifier's output terminals U,
refer to the section
V, W do not match servo motor's
13.1.
input terminals U, V, W.
3. Servo system is instable and
hunting.
4. Encoder faulty.
When the servo motor shaft is
rotated with the servo off, the
cumulative feedback pulses do not
vary in proportion to the rotary angle
of the shaft but the indication skips
or returns midway.
Cause
Checking method
Checking method
16 - 106
Action
1. Reduce load.
2. Check operation pattern.
3. Use servo 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.
Change the servo motor.
1. Reduce load.
2. Check operation pattern.
3. Use servo 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.
Change the servo motor.