Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 670

16. INDEXER POSITIONING OPERATION
Display Name
Overload 2 Maximum
A51
output current
flowed
continuously
for several
seconds due
to machine
collision or the
like.
Definition
1. Servo amplifier fault.
<Check method>
The alarm does not occur when the operation is
checked on the servo motor alone, disconnected
from the machine. (Check the operation by
restoring to the initial gain.)
2. The servo system is unstable and causing hunting
or resonance.
3. Machine collision
4. Wrong connection of servo motor.
Servo amplifier's output terminals U, V, and W do
not match servo motor's input terminals U, V, and
W.
5. Encoder fault.
<Check method>
When the servo motor shaft is rotated with the
servo-off, the cumulative feedback pulses do not
vary in proportion to the rotation angle of the shaft.
Or error such as deviation in position within one-
revolution at a stop.
6. Wire breakage of power supply cable.
7. Servo motor fault.
Cause
16 - 115
(Note 2)
Action
detailed
information
Change the servo
amplifier.
1. Repeat acceleration /
deceleration to
execute auto tuning.
2. Change the auto
tuning response
setting.
3. Set auto tuning to OFF
and make gain
adjustment manually.
4. Check the coupling
with servo motor shaft
for looseness.
1. Check operation
pattern.
2. Install limit switches.
3. Check if the
electromagnetic brake
is released.
Connect correctly.
Change the servo motor.
Repair the cable.
Change the servo motor.
Alarm