Mitsubishi Electric GENERAL PURPOSE AC SERVO MR-E- A/AG Instruction Manual page 158

10. TROUBLESHOOTING
Display Name
AL.1A Motor
combination
error
AL.20 Encoder error 2 Communication
AL.24 Main circuit
error
AL.30 Regenerative
alarm
Definition
Wrong combination Wrong combination of servo
of servo anplifier amplifier and servo motor connected.
and servo motor.
1. Encoder connector (CN2)
error occurred disconnected.
between encoder
2. Encoder fault
and servo amplifier.
3. Encoder cable faulty
(Wire breakage or shorted)
Ground fault 1. Power input wires and servo motor
occurred at the output wires are in contact at
servo motor outputs main circuit terminal block (TE1).
(U,V and W phases)
2. Sheathes of servo motor power
of the servo
cables deteriorated, resulting in
amplififer.
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.
Permissible 1. Wrong setting of parameter No. 0
regenerative power
2. Built-in regenerative brake
of the built-in
resistor or regenerative brake
regenerative brake
option is not connected.
resistor or
3. High-duty operation or continuous
regenerative brake
regenerative operation caused the
option is exceeded.
permissible regenerative power of
the regenerative brake option to
be exceeded.
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.
Regenerative
6. Regenerative transistor faulty.
transistor fault
1) The regenerative brake option
2) The alarm occurs even after
Cause
Checking method
Checking method
Checking method
has overheated abnormally.
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.