Mitsubishi Electric Melservo-J3 Series MR-J3-B Instruction Manual page 177

8. TROUBLESHOOTING
Display Name
37 Parameter error Parameter setting is
45 Main circuit
device overheat
46 Servo motor
overheat
47 Cooling fan
error
50 Overload 1
Definition
1. Servo amplifier fault caused the
wrong. parameter setting to be rewritten.
2. There is a parameter whose value
was set to outside the setting range
by the controller.
3. The number of write times to EEP-
ROM exceeded 100,000 due to
parameter write, etc.
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 motor
temperature rise is over 40 .
actuated the thermal
2. Servo motor is overloaded.
sensor.
3. Thermal sensor in encoder is faulty. Change servo motor.
The cooling fan of Cooling fan life expiration (Refer to
the servo amplifier section 2.5.)
stopped, or its speed
Foreign matter caught in the cooling
decreased to or
fan stopped rotation.
below the alarm
level.
The power supply of the cooling fan
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.
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 (51) occurred, turn
OFF/ON the power supply to clear
the alarm. Then the overload
operation is repeated.
Cause
Checking method
8 - 6
Action
Change the servo amplifier.
Change the parameter value to within the
setting range.
Change the servo amplifier.
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 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.
Connect correctly.
Change the servo motor.
1. Reduce load.
2. Review operation pattern.
3. Use servo motor that provides larger
output.