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11. TROUBLESHOOTING
Display Name Definition Cause Action
CPU/parts fault 1. Faulty parts in the servo amplifier.
Checking method
Alarm (AL.17) occurs if power is
switched on after disconnection
of all cable but the control circuit
power supply cable.
Change the servo amplifier.
AL.17
Board error
The output terminals
U, V, W of the servo
amplifier and the
input terminals U, V,
W of the servo motor
are not connected.
2. The wiring of U, V, W is
disconnected or not connected.
Correctly connect the output terminals U,
V, W of the servo amplifier and the input
terminals U, V, W of the servo motor.
AL.19
Memory error 3 ROM memory fault Faulty parts in the servo amplifier.
Checking method
Alarm (AL.19) occurs if power is
switched on after disconnection
of all cable but the control circuit
power supply cable.
Change the servo amplifier.
AL.1A Motor
combination
error
Wrong combination
of servo amplifier
and servo motor.
Wrong combination of servo amplifier
and servo motor connected.
Use correct combination.
1. Encoder connector (CN2)
disconnected.
Connect correctly.
2. Encoder fault Change the servo motor.
AL.20 Encoder error 2 Communication
error occurred
between encoder and
servo amplifier.
3. Encoder cable faulty
(wire breakage or shorted)
Repair or change the cable.
Encoder detected
acceleration error.
4. Excessive acceleration is occurred
due to oscillation and others.
1. Decrease the speed control gain 2.
2. Decrease the auto tuning response level.
1. Power input wires and servo motor
output wires are in contact at main
circuit terminal block (TE1).
Connect correctly.
2. Sheathes of servo motor power
cables deteriorated, resulting in
ground fault.
Change the cable.
AL.24 Main circuit
error
Ground fault
occurred at the servo
motor outputs (U,V
and W phases) of the
servo amplifier.
3. Main circuit of servo amplifier
failed.
Checking method
AL.24 occurs if the servo is
switched on after disconnecting
the U, V, W power cables from
the servo amplifier.
Change the servo amplifier.
1. Reduced voltage of super capacitor
in encoder
After leaving the alarm occurring for a few
minutes, switch power off, then on again.
Always make home position setting again.
2. Battery voltage low
Absolute position
data in error
3. Battery cable or battery is faulty.
Change battery.
Always make home position setting again.
AL.25 Absolute
position erase
Power was switched
on for the first time
in the absolute
position detection
system.
4. 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.