Mitsubishi Electric GENERAL PURPOSE AC SERVO MR-E- A/AG Instruction Manual page 160

10. TROUBLESHOOTING
Display Name
AL.37 Parameter
error
AL.45 Main circuit
device overheat
AL.46 Servo motor
overheat
AL.50 Overload 1
Definition
Parameter setting is 1. Servo amplifier fault caused the
wrong. parameter setting to be rewritten.
2. Regenerative brake option or servo
motor not used with servo
amplifier was selected in
parameter No.0.
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. Air cooling fan of servo amplifier
stops.
Servo motor 1. Ambient temperature of servo
temperature rise motor is over 40
actuated the
2. Servo motor is overloaded.
thermal protector.
3. Thermal protector 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.
Cause
(104 ).
Checking method
10 - 9
Action
Change the servo amplifier.
Set parameter No.0 correctly.
Change the servo amplifier.
Change the servo amplifier.
The drive method is reviewed.
1. Exchange the cooling fan or the servo
amplifier.
2. Reduce ambient temperature.
Review environment so that ambient
temperature is 0 to 40 (104 ).
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.