Mitsubishi Electric MR-J2S-A Instruction Manual page 205

10. TROUBLESHOOTING
Display Name
AL.15 Memory error 2 EEP-ROM fault
AL.16 Encoder error 1 Communication
error occurred
between encoder
and servo amplifier. 3. Encoder cable faulty
AL.17 Board error CPU/parts fault
The output
terminals U, V, W of
the servo amplifier
and the input
terminals U, V, W of
the servo motor are
not connected.
AL.19 Memory error 3 ROM memory fault Faulty parts in the servo amplifier.
AL.1A Motor Wrong combination
combination of servo amplifier
error and servo motor.
AL.20 Encoder error 2 Communication
error occurred
between encoder
and servo amplifier.
Encoder detected
acceleration error.
AL.24 Main circuit Ground fault
error occurred at the
servo motor outputs
(U,V and W phases)
of the servo
amplifier.
Definition
1. Faulty parts in the servo amplifier
Checking method
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)
disconnected.
2. Encoder fault
(Wire breakage or shorted)
1. Faulty parts in the servo amplifier.
Checking method
Alarm (AL.17) occurs if power is
switched on after disconnection
of all cable but the control circuit
power supply cable.
2. The wiring of U, V, W is
disconnected or not connected.
Checking method
Alarm (AL.19) occurs if power is
switched on after disconnection
of all cable but the control circuit
power supply cable.
Wrong combination of servo amplifier
and servo motor connected.
1. Encoder connector (CN2)
disconnected.
2. Encoder cable faulty
(Wire breakage or shorted)
3. Encoder fault
4. Excessive acceleration is occurred
due to oscillation and others.
1. Power input wires and servo motor
output wires are in contact at
main circuit terminal block (TE1).
2. Sheathes of servo motor power
cables deteriorated, resulting in
ground fault.
3. Main circuit of servo amplifier
failed.
Checking method
AL.24 occurs if the servo is
switched on after disconnecting
the U, V, W power cables from
the servo amplifier.
10 - 8
WWW.NNC.IR
Cause
Change the servo amplifier.
Connect correctly.
Change the servo motor.
Repair or change the 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.
1. Decrease the speed control gain 2.
2. Decrease the auto tuning response
level.
Connect correctly.
Change the cable.
Change the servo amplifier.
Action