Mitsubishi Electric MR-J2S-*B Series Instruction Manual page 137

9. TROUBLESHOOTING
Display Name
46 Servo motor
overheat
50 Overload 1
51 Overload 2
Definition
Servo motor 1. Ambient temperature of servo
temperature rise motor is over 40 .
actuated the
2. Servo motor is overloaded.
thermal sensor.
3. Thermal sensor in encoder is
faulty.
Load exceeded 1. Servo amplifier is used in excess
overload protection of 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.
Machine collision or 1. Machine struck something.
the like caused max.
output current to
2. Wrong connection of servo motor.
flow successively for
Servo amplifier's output terminals
several seconds.
U, V, W do not match servo
Servo motor locked:
motor's input terminals U, V, W.
1s or more
3. Servo system is instable and
During rotation:
hunting.
2.5s or more
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
9 - 6
Action
Review environment so that ambient
temperature is 0 to 40 .
1. Reduce load.
2. Review operation pattern.
3. Use servo motor that provides larger
output.
Change servo motor.
1. Reduce load.
2. Review 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. Review operation pattern.
2. Install limit switches.
Connect correctly.
Change the servo motor.
1. Review 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.