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9. TROUBLESHOOTING
Display
IFU DRU
Name Definition Cause Action
1. Encoder connector (CN2)
disconnected.
Connect correctly.
2. Encoder fault. Change the servo motor.
@A.20# Encoder error 2 Communication error
occurred between
encoder and drive
unit.
3. Encoder cable faulty.
(Wire breakage or shorted)
Repair or change cable.
1. Power input wires and servo motor
output wires are in contact at CNP2.
Connect correctly.
2. Sheathes of servo motor power
cables deteriorated, resulting in
ground fault.
Change the cable.
@A.24# Main circuit
error
Ground fault occurred
at the servo motor
outputs (U,V and W)
of the drive unit.
3. Main circuit of drive unit failed.
Checking method
Alarm (A.24) occurs if power is
switched on after disconnection of
the U, V, W power cables.
Change the drive unit.
1. Battery voltage low.Absolute position data
in error.
2. Battery cable or battery is faulty.
Change battery.
Always make home position
setting again.
@A.25# Absolute
position erase
Power was switched
on for the first time in
the absolute position
detection system.
3. Super capacitor of the absolute
position encoder is not charged.
After leaving the alarm occurring
for a few minutes, switch power
off, then on again. Always make
home position setting again.
1. Mismatch between used
regenerative brake option and DRU
parameter No. 2 setting.
Set correctly.
2. Regenerative brake option is not
connected.
Connect correctly.
3. High-duty operation or continuous
regenerative operation caused the
permissible regenerative power of
the regenerative brake option to be
exceeded.
Checking method
Call the status display and check
the regenerative load ratio.
1. Reduce the frequency of
positioning.
2. Use the regenerative brake
option of larger capacity.
3. Reduce the load.
4. Power supply voltage rose to or
above 200VAC.
Review power supply.
Permissible
regenerative power of
the regenerative brake
option is exceeded.
5. Regenerative brake option faulty. Change regenerative brake
option.
FA.30 Regenerative
alarm
Regenerative
transistor fault
6. Regenerative transistor faulty.
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.
Change the drive unit.