Mitsubishi Electric MELSERVO-J3 Series Manual page 623

16. INDEXER POSITIONING OPERATION
Display Name
A15 Memory error 2
(EEP-ROM)
A16 Encoder error 1
(At power on)
A17 Board error
A19 Memory error 3
(Flash ROM)
A1A Motor
combination
error
A20 Encoder error 2 Communication
A24 Main circuit
error
A25 Absolute
position erase
Definition
EEP-ROM fault 1. Faulty parts in the servo amplifier
Alarm (A15) occurs if power is
switched on after disconnection
of all cables but the control circuit
power supply cables.
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.
Communication 1. Encoder connector (CN2)
error occurred disconnected.
between encoder
2. Encoder fault
and servo amplifier.
3. Encoder cable faulty
(Wire breakage or shorted)
4. Encoder cable type (2-wire, 4-wire)
selection was wrong in parameter
setting.
CPU/parts fault Faulty parts in the servo amplifier
ROM memory fault
Alarm (A17 or A19) occurs if
power is switched on after
disconnection of all cables but the
control circuit power supply cable.
Wrong combination Wrong combination of servo amplifier
of servo amplifier and servo motor connected.
and servo motor.
1. Encoder connector (CN2)
error occurred disconnected.
between encoder
2. Encoder cable faulty
and servo amplifier.
(Wire breakage or shorted)
3. Encoder fault
Ground fault 1. Power input wires and servo motor
occurred at the power wires are in contact.
servo motor power
2. Sheathes of servo motor power
(U,V and W phases)
cables deteriorated, resulting in
of the servo
ground fault.
amplifier.
3. Main circuit of servo amplifier failed.
Alarm (A24) occurs if the servo is
switched on after disconnecting
the U, V, W power cables from
the servo amplifier.
Absolute position 1. Voltage drop in encoder
data in error (Battery disconnected.)
2. Battery voltage low
3. Battery cable or battery is faulty.
Power was switched 4. Home position not set.
on for the first time
in the absolute
position detection
system.
Cause
Checking method
Checking method
Checking method
16 - 102
Action
Change the servo amplifier.
Execute a home position setting.
Connect correctly.
Change the servo motor.
Repair or change the cable.
Correct the setting in the fourth digit of
parameter No.PC22.
Change the servo amplifier.
Use correct combination.
Connect correctly.
Repair or change the cable.
Change the servo motor.
Connect correctly.
Change the cable.
Change the servo amplifier.
After leaving the alarm occurring for a few
minutes, switch power off, then on again.
Always make home position setting again.
Change the battery.
Always make home position setting again.
After leaving the alarm occurring for a few
minutes, switch power off, then on again.
Always make home position setting again.