Mitsubishi Electric MR-E A Series Instruction Manual page 160

10. TROUBLESHOOTING
Display
AL.37 Parameter
error
AL.45 Main circuit
device overheat
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AL.46 Servo motor
overheat
AL.50 Overload 1
Name Definition
Parameter setting is
wrong.
Main circuit device
overheat
Servo motor
temperature rise
actuated the
thermal protector.
Load exceeded
overload protection
characteristic of
servo amplifier.
Cause
1. Servo amplifier fault caused the
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.
1. Servo amplifier faulty.
2. The power supply was turned on
and off continuously by overloaded
status.
3. Air cooling fan of servo amplifier
stops.
1. Ambient temperature of servo
motor is over 40 (104 ).
2. Servo motor is overloaded.
3. Thermal protector in encoder is
faulty.
1. Servo amplifier is used in excess
of its continuous output current.
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.
Checking method
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.
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.