Mitsubishi Electric Melservo MR-J3-A Instruction Manual page 247

9. TROUBLESHOOTING
Display Name
AL.45 Main circuit
device
overheat
AL.46 Servo motor
overheat
AL.47 Cooling fan
alarm
AL.50 Overload 1
Definition
Main circuit device 1. Servo amplifier faulty.
overheat
2. The power supply was turned on
and off continuously by overloaded
status.
3. Ambient temperature of servo
motor is over 55 .
4. Used beyond the specifications of
close mounting.
Servo motor 1. Ambient temperature of servo
temperature rise motor is over 40 .
actuated the thermal
2. Servo motor is overloaded.
sensor.
3. Thermal sensor in encoder is
faulty.
Cooling fan life expiration (Refer to
The cooling fan of
section 2.5.)
the servo amplifier
stopped, or its
Foreign matter caught in the fan
speed decreased to
stopped rotation.
or below the alarm
The power supply of the cooling fan
level.
failed.
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.
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 (AL.51) occurred,
turn OFF/ON the power supply to
clear the alarm. Then the overload
operation is repeated.
Cause
Checking method
9 - 6
Action
Change the servo amplifier.
The drive method is reviewed.
Review environment so that ambient
temperature is 0 to 55 .
Use within the range of specifications.
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.
Change the cooling fan of the servo
amplifier.
Remove the foreign matter.
Change servo amplifier.
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.
Change the servo motor.
1. Reduce load.
2. Review operation pattern.
3. Use servo motor that provides larger
output.