Mitsubishi Electric MR-E A Series Instruction Manual page 158

10. TROUBLESHOOTING
Display
AL.1A Motor
combination
error
AL.20 Encoder error 2 Communication
AL.24 Main circuit
error
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AL.30 Regenerative
alarm
Name Definition
Wrong combination
of servo anplifier
and servo motor.
error occurred
between encoder
and servo amplifier.
Ground fault
occurred at the
servo motor outputs
(U,V and W phases)
of the servo
amplififer.
Permissible
regenerative power
of the built-in
regenerative brake
resistor or
regenerative brake
option is exceeded.
Regenerative
transistor fault
Cause
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)
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.
1. Wrong setting of parameter No. 0
2. Built-in regenerative brake
resistor or regenerative brake
option is not connected.
3. High-duty operation or continuous
regenerative operation caused the
permissible regenerative power of
the regenerative brake option to
be exceeded.
Checking method
Call the status display and check
the regenerative load ratio.
4. Power supply voltage is abnormal.
MR-E- A:260V or more
5. Built-in regenerative brake
resistor or regenerative brake
option faulty.
6. Regenerative transistor faulty.
Checking method
1) The regenerative brake option
has overheated abnormally.
2) The alarm occurs even after
removal of the built-in
regenerative brake resistor or
regenerative brake option.
10 - 7
Action
Use correct combination.
Connect correctly.
Change the servo motor.
Repair or change the cable.
Connect correctly.
Change the cable.
Change the servo amplifier.
Set correctly.
Connect correctly
1. Reduce the frequency of positioning.
2. Use the regenerative brake option of
larger capacity.
3. Reduce the load.
Review power supply
Change servo amplifier or regenerative
brake option.
Change the servo amplifier.