Instruction manual

8 - 6
8. TROUBLESHOOTING
Display Name Definition Cause Action
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
.
Review 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
.
Review environment so that ambient
temperature is 0 to 40 .
2. Servo motor is overloaded. 1. Reduce load.
2. Review 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 servo motor.
Cooling fan life expiration (Refer to
Section 2.5.)
Change the cooling fan of the servo
amplifier.
Foreign matter caught in the fan
stopped rotation.
Remove the foreign matter.
47 Cooling fan
alarm
The cooling fan of
the servo amplifier
stopped, or its speed
decreased to or
below the alarm
level.
The power supply of the cooling fan
failed.
Change servo amplifier.
1. Servo amplifier is used in excess
of its continuous output current.
1. Reduce load.
2. Review 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. Review 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.
1. Machine struck something. 1. Review operation pattern.
2. Install limit switches.
2. 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.
3. 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.
51 Overload 2 Machine collision or
the like caused max.
output current to flow
successively for
several seconds.
Servo motor locked:
1s or more
During rotation:
2.5s or more
4. 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.