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11. TROUBLESHOOTING
Display Name Definition
Cause
Action
1. Faulty parts in the servo amplifier
Checking method
Alarm (A15) occurs if power is
switched on after disconnection
of all cables but the control circuit
power supply cables.
A15 Memory error 2
(EEP-ROM)
EEP-ROM fault
2. The number of write times to EEP-
ROM exceeded 100,000.
Change the servo amplifier.
1. Encoder connector (CN2)
disconnected.
Connect correctly.
2. Encoder fault Change the servo motor.
3. Encoder cable faulty
(Wire breakage or shorted)
Repair or change the cable.
A16 Encoder error 1
(At power on)
Communication error
occurred between
encoder and servo
amplifier.
4. Encoder cable type (2-wire, 4-wire)
selection was wrong in parameter
setting.
Correct the setting in the fourth digit of
parameter No.PC22.
A17 Board error CPU/parts fault
A19 Memory error 3
(Flash ROM)
ROM memory fault
Faulty parts in the servo amplifier
Checking method
Alarm (A17 or A19) occurs if
power is switched on after
disconnection of all cables but the
control circuit power supply cable.
Change the servo amplifier.
A1A 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 cable faulty
(Wire breakage or shorted)
Repair or change the cable.
A20 Encoder error 2 Communication error
occurred between
encoder and servo
amplifier.
3. Encoder fault Change the servo motor.
1. Power input wires and servo motor
power wires are in contact.
Connect correctly.
2. Sheathes of servo motor power
cables deteriorated, resulting in
ground fault.
Change the cable.
A24 Main circuit error Ground fault
occurred at the servo
motor power (U,V
and W phases) of
the servo amplifier.
3. Main circuit of servo amplifier failed.
Checking method
Alarm (A24) occurs if the servo is
switched on after disconnecting
the U, V, W power cables from
the servo amplifier.
Change the servo amplifier.
1. Voltage drop in encoder
(Battery disconnected.)
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 the battery.
Always make home position setting again.
A25 Absolute
position erase
Power was switched
on for the first time in
the absolute position
detection system.
4. Home position not set. After leaving the alarm occurring for a few
minutes, switch power off, then on again.
Always make home position setting again.