11 - 6
11. TROUBLESHOOTING
Display
Name
Definition
Cause
Action
1. Lead of built-in regenerative brake
resistor or regenerative brake option is
open or disconnected.
1. Change lead.
2. Connect correctly.
2. Regenerative transistor faulty.
Change servo amplifier
3. Wire breakage of built-in regenerative
brake resistor or regenerative brake
option
1. For wire breakage of built-in
regenerative brake resistor,
change servo amplifier.
2. For wire breakage of
regenerative brake option,
change regenerative brake
option.
A.33
Overvoltage
Converter bus
voltage exceeded
400V.
4. Capacity of built-in regenerative brake
resistor or regenerative brake option is
insufficient.
Add regenerative brake option
or increase capacity.
1. Pulse frequency of the manual pulse
generator is too high.
Change the pulse frequency to a
proper value.
2. Noise entered the pulses of the manual
pulse generator.
Take action against noise.
A.35
Command pulse
frequency error
Input pulse
frequency of the
manual pulse
generator is too high.
3. Manual pulse generator failure
Change the manual pulse
generator.
1. Servo amplifier fault caused the
parameter setting to be rewritten.
Change the servo amplifier.
2. Regenerative brake option not used
with servo amplifier was selected in
parameter No.0.
Set parameter No.0 correctly.
A.37
Parameter error
Parameter or point
table setting is
wrong.
3. Point table data is in error.
Set the point table data correctly.
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
protector.
3. Thermal protector in encoder is faulty.
Change 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
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.
A.50
Overload 1
Load exceeded
overload protection
characteristic of
servo amplifier.
Load ratio 300%:
2.5s or more
Load ratio 200%:
100s or more
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.
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