Mitsubishi Electric MELSERVO MR-J2S- A Instruction Manual page 201

10. TROUBLESHOOTING
Display Name
AL.15 Memory error 2 EEP-ROM fault
AL.16 Encoder error 1 Communication
AL.17 Board error 2
AL.19 Memory error 3 ROM memory fault Faulty parts in the servo amplifier.
AL.1A Motor
combination
error
AL.20 Encoder error 2 Communication
AL.24 Main circuit
error
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. Encoder connector (CN2)
error occurred disconnected.
between encoder
2. Encoder fault
and servo amplifier. 3. Encoder cable faulty
(Wire breakage or shorted)
CPU/parts fault 1. Faulty parts in the servo amplifier.
Alarm (AL.17) occurs if power is
switched on after disconnection
of all cable but the control circuit
power supply cable.
The output 2. The wiring of U, V, W is
terminals U, V, W of disconnected or not connected.
the servo amplifier
and the input
terminals U, V, W of
the servo motor are
not connected.
Alarm (AL.19) occurs if power is
switched on after disconnection
of all cable but the control circuit
power supply cable.
Wrong combination Wrong combination of servo amplifier
of servo anplifier 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 output wires are in contact at
servo motor outputs main 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.
Cause
Checking method
Checking method
Checking method
Checking method
10 - 8
Action
Change the servo amplifier.
Connect correctly.
Change the servo motor.
Repair or change cable.
Change the servo amplifier.
Correctly connect the output terminals U,
V, W of the servo amplifier and the input
terminals U, V, W of the servo motor.
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.