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11. TROUBLESHOOTING
Display Name Definition Cause Action
AL.17 Board error CPU/parts fault
AL.19 Memory error 3 ROM memory fault
Faulty parts in the servo amplifier
Checking method
Alarm (A.17 or A.18) occurs
if power is switched on after
disconnection of all cables
but the control circuit power
supply cables.
Change the servo amplifier.
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 Cange 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. Reduced voltage of super capacitor
in encoder
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
Absolute position
data in error
3. Battery cable or battery is faulty.
Change battery.
Always make home position setting again.
AL.25 Absolute
position erase
Power was switched
on for the first time
in the absolute
position detection
system.
4. Super capacitor of the absolute
position encoder is not charged
After leaving the alarm occurring for a few
minutes, switch power off, then on again.
Always make home position setting again.
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-J2S-
CL:260VAC or more
MR-J2S-
CL1:135VAC 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.