Mitsubishi MELSEC-A A1SD71-S2 User Manual page 155

8. TROUBLESHOOTING
MELSEC-A
(2) Zero point position has shifted (using zero-phase signal)
Check the distance the zero point
has moved.
I
YES
is turned OFF is too
close
to the point where the
'
Check if the position where the near-point signal
zero-phase point signal is turned ON.
Refer to Section
3.4.2.
Make sure the zero point is
close to the near-zero signal.
YES
,
Check for near-point dog chattering.
Replace if necessary.
i
If zero return i s completed,
check which near-point signal
stays ON.
YES Near-point dog sensor contact or wiring is faulty.
Replace faulty equipment.
*
Check for a zero-phase signal.
NO
,
Check the zero-phase signal circuit; correct i f nec-
essary.
+
Contact Mitsubishi representa-
Motor drive unit is faulty.
+
Replace
it.
tive.
Note :
When using the stopper method, make sure that the stop signal is input or
timer setting is correct. If so, theAlSD71 or motor drive unit is faulty. Replace
the faulty AlSD71 or motor drive unit.
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