Mitsubishi Electric EZMOTION MR-E Super MR-E-70A-QW003 - Page 158

10 - 7
10. TROUBLESHOOTING
Display Name Definition Cause Action
AL.1A Motor
combination
error
Wrong combination
of servo amplifier
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
power 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 powers
(U,V and W phases)
of the servo
amplifier.
3. Main circuit of servo amplifier failed.
Checking method
Alarm (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 resistor or
regenerative option is not
connected.
Connect correctly.
3. High-duty operation or continuous
regenerative operation caused the
permissible regenerative power of
the regenerative 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 option of larger
capacity.
3. Reduce the load.
4. Power supply voltage is abnormal.
MR-E-
A-QW003: 260VAC or
more
Check the power supply.
Permissible
regenerative power
of the built-in
regenerative resistor
or regenerative
option is exceeded.
5. Built-in regenerative resistor or
regenerative option faulty.
Change servo amplifier or regenerative
option.
AL.30 Regenerative
error
Regenerative
transistor fault
6. Regenerative transistor faulty.
Checking method
1) The regenerative option has
overheated abnormally.
2) The alarm occurs even after
removal of the built-in
regenerative resistor or
regenerative option.
Change the servo amplifier.
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