MITSUBISHI ELECTRIC MR-E- A/AG - Manual (Page 158)

10 - 7
10. TROUBLESHOOTING
Display Name Definition Cause Action
AL.1A Motor
combination
error
Wrong combination
of servo anplifier
and servo motor.
Wrong combination of servo
amplifier and servo motor connected.
Use correct combination.
1. Encoder connector (CN2)
disconnected.
Connect correctly.
2. Encoder fault Change the servo motor.
AL.20 Encoder error 2 Communication
error occurred
between encoder
and servo amplifier. 3. Encoder cable faulty
(Wire breakage or shorted)
Repair or change the cable.
1. Power input wires and servo motor
output wires are in contact at
main circuit terminal block (TE1).
Connect correctly.
2. Sheathes of servo motor power
cables deteriorated, resulting in
ground fault.
Change the cable.
AL.24 Main circuit
error
Ground fault
occurred at the
servo motor outputs
(U,V and W phases)
of the servo
amplififer.
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.
Change the servo amplifier.
1. Wrong setting of parameter No. 0 Set correctly.
2. Built-in regenerative brake
resistor or regenerative brake
option is not connected.
Connect correctly
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.
1. Reduce the frequency of positioning.
2. Use the regenerative brake option of
larger capacity.
3. Reduce the load.
4. Power supply voltage is abnormal.
MR-E- A:260V or more
Review power supply
Permissible
regenerative power
of the built-in
regenerative brake
resistor or
regenerative brake
option is exceeded.
5. Built-in regenerative brake
resistor or regenerative brake
option faulty.
Change servo amplifier or regenerative
brake option.
AL.30 Regenerative
alarm
Regenerative
transistor fault
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.
Change the servo amplifier.