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8. TROUBLESHOOTING
Display
Name
37
Parameter
Parameter setting is
error
wrong.
46
Servo motor
Servo motor
overheat
temperature rise
actuated the thermal
protector.
50
Overload 1
Load exceeded
overload protection
characteristic of servo
amplifier.
Load ratio 300%:
Load ratio 200%:
Definition
1. Servo amplifier fault caused the
parameter setting to be rewritten.
2. Regenerative brake option not used
with servo amplifier was selected
in parameter No. 2.
1. Ambient temperature of servo
motor is over 40 .
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
2.5s or more
hunting.
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.
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.
Cause
Checking method
8 - 5
Action
Change the servo amplifier.
Set parameter No. 2 correctly.
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.
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.
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