9 - 7
9. TROUBLESHOOTING
Display Name Definition Cause Action
(Note 2)
Alarm details
AL.25 Absolute
position erase
Absolute position
data is erased.
1. Voltage drop in encoder.
(Battery disconnected.)
After leaving the alarm
occurring for a few minutes,
switch power off, then on
again. Always make home
position setting again.
2. Battery voltage low. Change the battery.
Always make home position
setting again.
3. Loose connection of the battery
connector, or battery fault
Change the battery.
Always make home position
setting again.
Repair or change the
encoder cable.
4. Encoder cable fault.
5. Encoder fault. Change the servo motor.
Power was
switched on for the
first time in the
absolute position
detection system.
6. Home position not set. After leaving the alarm
occurring for a few minutes,
switch power off, then on
again. Always to make home
position setting again.
AL.30 Regenerative
error
Permissible
regenerative power
of the built-in
regenerative
resistor or
regenerative option
is exceeded.
1. Incorrect setting of parameter No.
PA02
Set correctly. 1
2. 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 MR
Comfigurator, and check the
regenerative load ratio.
1. Reduce the frequency of
positioning.
2. Use the regenerative
option of larger capacity.
3. Reduce the load.
3. Bus voltage is abnormal.
MR-J3-
A(1): 400VDC or more
MR-J3-
A4: 800VDC or more
Check the power supply.
4. Built-in regenerative resistor or
regenerative option is not connected.
Connect correctly. 4
5. Built-in regenerative resistor or
regenerative option faulty.
Change the servo amplifier
or regenerative option.
Regenerative
transistor fault
6. Servo amplifier fault.
(Regenerative transistor fault.)
<Checking method>
1. The regenerative option has
overheat abnormally.
2. The alarm occurs even after removal
of the built-in regenerative resistor or
regenerative option.
Change the servo amplifier.
7. Servo amplifier fault.
(Regenerative circuit fault.)
Change the servo amplifier. 2
