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

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16 - 114
16. INDEXER POSITIONING OPERATION
Display Name Definition Cause Action
(Note 2)
Alarm
detailed
information
A50
Overload 1 Load exceeded
overload
protection
characteristic
of servo
amplifier.
1. Servo amplifier is used in excess of its continuous
output current.
1. Reduce load.
2. Check operation
pattern.
3. Check if the
electromagnetic brake
is released.
4. Check the friction of
the machine.
5. Use a servo amplifier
and a servo motor that
provide larger output.
1
2. After Overload 2 (A51) occurred and the alarm
was cleared by the power supply turned OFF and
ON, the overload operations have been repeated.
1. Reduce the load.
2. Check operation
pattern.
3. Use a servo amplifier
that provides larger
output.
1
3. The servo system is unstable and causing hunting
or resonance.
1. Repeat
acceleration/decelerati
on 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, 2
4. 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
but the indication skips or returns midway.
Change the servo motor.