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8. TROUBLESHOOTING
Display Name Definition Cause Action
1. Servo amplifier fault caused the
parameter setting to be rewritten.
Change the servo amplifier.
2. There is a parameter whose value
was set to outside the setting range
by the controller.
Change the parameter value to within the
setting range.
37 Parameter error Parameter setting is
wrong.
3. The number of write times to EEP-
ROM exceeded 100,000 due to
parameter write, etc.
Change the servo amplifier.
1. Servo amplifier faulty. Change the servo amplifier.
2. The power supply was turned on
and off continuously by overloaded
status.
The drive method is reviewed.
3. Ambient temperature of servo motor
is over 55
.
Check environment so that ambient
temperature is 0 to 55 .
45 Main circuit
device overheat
Main circuit device
overheat
4. Used beyond the specifications of
close mounting.
Use within the range of specifications.
1. Ambient temperature of servo motor
is over 40
.
Check environment so that ambient
temperature is 0 to 40 .
2. Servo motor is overloaded. 1. Reduce load.
2. Check operation pattern.
3. Use servo motor that provides larger
output.
46 Servo motor
overheat
Servo motor
temperature rise
actuated the thermal
sensor.
3. Thermal sensor in encoder is faulty. Change the servo motor.
1. Cooling fan life expiration (Refer to
section 2.5.)
Change the cooling fan of the servo
amplifier.
2. Foreign matter caught in the cooling
fan stopped rotation.
Remove the foreign matter.
47 Cooling fan
error
The cooling fan of
the servo amplifier
stopped, or its speed
decreased to or
below the alarm
level.
3. The power supply of the cooling fan
failed.
Change the servo amplifier.
1. Servo amplifier is used in excess
of its continuous output current.
1. Reduce load.
2. Check operation pattern.
3. Use servo motor that provides larger
output.
2. Servo system is instable and
hunting.
1. Repeat acceleration/
deceleration to execute auto tuning.
2. Change the auto tuning response setting.
3. Set auto tuning to OFF and make gain
adjustment manually.
3. Machine struck something. 1. Check operation pattern.
2. Install limit switches.
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.
Connect correctly.
50 Overload 1 Load exceeded
overload protection
characteristic of
servo amplifier.
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.
Change the servo motor.
6. After Overload 2 (51) occurred, turn
OFF/ON the power supply to clear
the alarm. Then the overload
operation is repeated.
1. Reduce load.
2. Check operation pattern.
3. Use servo motor that provides larger
output.