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8. TROUBLESHOOTING
Display
Name
20
Encoder error 2
24
Output side
ground fault
25
Absolute position
erase
30
Regenerative
alarm
Definition
Communication error
1. Encoder connector disconnected.
occurred between
2. Encoder cable faulty
encoder and servo
(wire breakage or short)
amplifier.
Servo motor outputs
Contact of power supply input cables
(U, V, W phases) of
and servo motor outputs in main
servo amplifier
circuit terminal block.
resulted in ground
Sheathes of servo motor power cables
fault.
deteriorated, resulting in ground fault.
Main circuit of servo amplifier failed.
Absolute position data
1. Reduced voltage of super capacitor
in error
in encoder
2. Battery voltage low
3. Battery cable or battery is faulty.
Power was switched
4. Super capacitor of the absolute
on for the first time in
position encoder is not charged.
the absolute position
detection system.
Permissible
1. Wrong setting of parameter No. 0
regenerative power of
2. Built-in regenerative brake resistor
the built-in
or regenerative brake option is not
regenerative brake
connected.
resistor or
3. High-duty operation or continuous
regenerative brake
regenerative operation caused the
option is exceeded.
permissible regenerative power of
the regenerative brake option to be
exceeded.
4. Power supply voltage increased to
260V or more.
Regenerative
5. Regenerative transistor faulty.
transistor fault
6. Built-in regenerative brake resistor
or regenerative brake option faulty.
Cause
Checking method
24 occurs if the servo is switched
on after disconnecting the U, V,
W power cables from the servo
amplifier.
Checking method
Call the status display and check
the regenerative load ratio.
Checking method
1) The regenerative brake option
has overheated abnormally.
2) The alarm occurs even after
removal of the built-in
regenerative brake resistor or
regenerative brake option.
8 - 3
Action
Connect correctly.
Repair or change the cable.
Correct wiring.
Change cables.
Change servo amplifier.
After leaving the alarm occurring for
a few minutes, switch power off, then
on again. Always make home
position return again.
Always change battery. Make home
position return again
After leaving the alarm occurring for
a few minutes, switch power off, then
on again.
Home position setting must be made
again.
Set correctly.
Connect correctly
1. Reduce the frequency of
positioning.
2. Use the regenerative brake option
of larger capacity.
3. Reduce the load.
Review power supply
Change the servo amplifier.
Change servo amplifier or
regenerative brake option.
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