Mitsubishi melservo-j2 series Instruction Manual page 209

11. TROUBLESHOOTING
Display Name
A.37 Parameter error
A.46 Servo motor
overheat
A.50 Overload 1
Definition
Parameter or point 1. Servo amplifier fault caused the
table setting is parameter setting to be rewritten.
abnormal.
2. Regenerative brake option not used
with servo amplifier was selected in
parameter No.0.
3. Point table data is in error.
Servo motor 1. Ambient temperature of servo motor is
temperature rise over 40°C.
actuated the thermal
protector.
2. Servo motor is overloaded.
3. Thermal protector in encoder is faulty.
Load exceeded 1. Servo amplifier is used in excess of its
overload protection continuous output current.
characteristic of
servo amplifier.
Load ratio 300%:
2. Servo system is instable and hunting.
2.5s or more
Load ratio 200%:
100s or more
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.
Cause
Checking method
When the servo motor shaft is
rotated slowly with the servo off,
the cumulative feedback pulses
should vary in proportion to the
rotary angle. If the indication
skips or returns midway, the
encoder is faulty.
11 - 6
Action
Change the servo amplifier.
Set parameter No.0 correctly.
Set the point table data correctly.
Review environment so that
ambient temperature is 0 to
40°C.
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.