10 - 9
10. TROUBLESHOOTING
Display Name Definition Cause Action
1. Pulse frequency of the command
pulse is too high.
Change the command pulse frequency to a
proper value.
2. Noise entered command pulses. Take action against noise.
AL.35 Command
pulse frequency
error
Input pulse
frequency of the
command pulse is
too high.
3. Command device failure Change the command device.
1. Servo amplifier fault caused the
parameter setting to be rewritten.
Change the servo amplifier.
2. Regenerative option or servo motor
not used with servo amplifier was
selected in parameter No.0.
Set parameter No.0 correctly.
AL.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.
AL.45 Main circuit
device overheat
Main circuit device
overheat
3. Air cooling fan of servo amplifier
stops.
1. Exchange the cooling fan or the servo
amplifier.
2. Reduce ambient temperature.
1. Ambient temperature of servo motor
is over 40
(104
).
Review environment so that ambient
temperature is 0 to 40 (104 ).
2. Servo motor is overloaded. 1. Reduce load.
2. Review operation pattern.
3. Use servo motor that provides larger
output.
AL.46 Servo motor
overheat
Servo motor
temperature rise
actuated the thermal
sensor.
3. Thermal sensor in encoder is faulty. Change the servo motor.
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.
AL.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.
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