Mitsubishi Electric MELSERVO-J2-Super Series Instruction Manual page 277

12. TROUBLESHOOTING
Display Name
AL.15 Memory error 2 EEP-ROM fault
AL.16 Encoder error 1 Communication
AL.17 Board error
AL.19 Memory error 3 ROM memory fault
AL.1A Motor
combination
error
AL.20 Encoder error 2 Communication
AL.24 Main circuit
error
AL.25 Absolute
position erase
Definition
1. Faulty parts in the servo amplifier
Alarm (AL.15)
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.
1. Encode connector (CN2)
error occurred disconnected.
between encoder
2. Encoder fault
and servo amplifier 3. Encoder cable faulty
(wire breakage or short)
CPU/parts fault
Faulty parts in the servo amplifier
Alarm (AL.17 AL.19) occurs
if power is switched on after
disconnection of all cables
but the control circuit power
supply cables.
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 fault
and servo amplifier. 3. Encoder cable faulty
(wire breakage or shorted)
Ground fault 1. Power input wires and servo motor
occurred at the output wires are in contact at main
servo motor outputs circuit terminal block (TE1).
(U,V and W phases)
2. Sheathes of servo motor power
of the servo
cables deteriorated, resulting in
amplififer.
ground fault.
3. Main circuit of servo amplifier
failed.
AL.24 occurs if the servo is
switched on after disconnecting
the U, V, W power cables from
the servo amplifier.
Absolute position 1. Reduced voltage of super capacitor
data in error in encoder
2. Battery voltage low
3. Battery cable or battery is faulty.
Power was switched 4. Super capacitor of the absolute
on for the first time position encoder is not charged
in the absolute
position detection
system.
Cause
Checking method
Checking method
Checking method
12 - 6
Action
Change the servo amplifier.
Connect correctly.
Change the servo motor.
Repair or change the cable.
Change the servo amplifier.
Use correct combination.
Connect correctly.
Cange the servo motor.
Repair or change the cable.
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 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.