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10. TROUBLESHOOTING
Display Name Definition Cause Action
A45 Main circuit
device overheat
Main circuit device
overheat
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
(131 ).
Check environment so that ambient
temperature is 0 to 55 (32 to 131 ).
4. Used beyond the specifications of
close mounting.
Use within the range of specifications.
A46 Servo motor
overheat
Servo motor
temperature rise
actuated the thermal
sensor.
1. Ambient temperature of servo motor
is over 40
(104 ).
Check environment so that ambient
temperature is 0 to 40 (32 to 104 ).
2. Servo motor is overloaded. 1. Reduce load.
2. Check operation pattern.
3. Use servo motor that provides larger
output.
3. Thermal sensor in encoder is faulty. Change the servo motor.
A47 Cooling fan
alarm
The cooling fan of
the servo amplifier
stopped, or its speed
decreased to or
below the alarm
level.
Cooling fan life expiration (Refer to
section 2.5.)
Change the cooling fan of the servo
amplifier.
Foreign matter caught in the cooling
fan stopped rotation.
Remove the foreign matter.
The power supply of the cooling fan
failed.
Change the servo amplifier.
A50 Overload 1 Load exceeded
overload protection
characteristic of
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 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.
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 (A51) 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.