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9. TROUBLESHOOTING
Display
IFU DRU
Name Definition Cause Action
1. Interface unit fault caused the IFU
parameter setting to be rewritten.
Change the interface unit.
2. There is a IFU parameter whose
value was set to outside the setting
range by the controller.
Change the IFU parameter value
to within the setting range.
FA.37 IFU parameter
error
IFU 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. Drive unit fault caused the DRU
parameter setting to be rewritten.
Change the drive unit.@A.37# DRU parameter
error
DRU parameter
setting is wrong.
2. There is a DRU parameter whose
value was set to outside the setting
range by the controller.
Change the DRU parameter
value to within the setting range.
FA.38 DRU parameter
adjustment
error
In some drive unit, the
parameter which
requires all axes to be
set for the same value
differs from those of
the other axes.
There is a drive unit whose DRU
parameter No. 2 or 23 setting is
different from others.
Make correct setting.
1. Drive unit faulty. Change the drive unit.
2. The power supply was turned on
and off continuously by overloaded
status.
The drive method is reviewed.
@A.45# Main circuit
device overheat
Main circuit device
overheat.
3. Air cooling fan of drive unit stops. 1. Change the drive unit or
cooling fan.
2. Reduce ambient temperature.
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.
@A.46# Servo motor
overheat
Servo motor
temperature rise
actuated the thermal
sensor.
3. Thermal sensor in encoder is faulty. Change servo motor.
1. Drive unit 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
level 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.
Drive unit's output U, V, W do not
match servo motor's input U, V, W.
Connect correctly.
@A.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.