Mitsubishi Electric MR-J2S-CP Instruction Manual page 235

11. TROUBLESHOOTING
Display Name
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
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.
AL.25 Absolute Absolute position
position erase data in error
Power was switched
on for the first time
in the absolute
position detection
system.
Definition
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.
2. The wiring of U, V, W is
disconnected or not connected.
Faulty parts in the servo amplifier.
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 fault
3. Encoder cable faulty
(wire breakage or shorted)
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.
AL.24 occurs if the servo is
switched on after disconnecting
the U, V, W power cables from
the servo amplifier.
1. Reduced voltage of super capacitor
in encoder
2. Battery voltage low
3. Battery cable or battery is faulty.
4. Super capacitor of the absolute
position encoder is not charged
Cause
Checking method
Checking method
Checking method
11 - 4
Action
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.
Change the servo motor.
Repair or change the cable.
1. Decrease the speed control gain 2.
2. Decrease the auto tuning response level.
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.