Mitsubishi Electric Melservo-J3 Series MR-J3-B, Instruction Manual

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16. INDEXER POSITIONING OPERATION
Display Name Definition Cause Action
(Note 2)
Alarm
detailed
information
A51
Overload 2 Maximum
output current
flowed
continuously
for several
seconds due
to machine
collision or the
like.
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.)
Change the servo
amplifier.
2. The servo system is unstable and causing hunting
or resonance.
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.
3. Machine collision 1. Check operation
pattern.
2. Install limit switches.
3. Check if the
electromagnetic brake
is released.
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.
Connect correctly.
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.
Change the servo motor.
6. Wire breakage of power supply cable. Repair the cable.
7. Servo motor fault. Change the servo motor.