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16. INDEXER POSITIONING OPERATION
Display Name Definition
Cause
Action
A15 Memory error 2
(EEP-ROM)
EEP-ROM fault 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.
Change the servo amplifier.
2. The number of write times to EEP-
ROM exceeded 100,000.
3. The multi-revolution data, which is
saved as a home position, read from
EEP-ROM is abnormal.
Execute a home position setting.
A16 Encoder error 1
(At power on)
1. Encoder connector (CN2)
disconnected.
Connect correctly.
2. Encoder fault Change the servo motor.
Communication
error occurred
between encoder
and servo amplifier.
3. Encoder cable faulty
(Wire breakage or shorted)
Repair or change the cable.
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.
Main circuit
error
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
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.
Absolute
position erase
Absolute position
data in error
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
3. Battery cable or battery is faulty.
Change the battery.
Always make home position setting again.
A25
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.