Mitsubishi A1SD75P1-S3, User Manual

Page: 284 / 622

8 - 9
MELSEC-A
8 ZERO POINT RETURN CONTROL
Restrictions
(1) Always limit the servomotor torque after starting deceleration.
If the torque is not limited, the servomotor may fail when the machine presses
against the stopper. (Refer to section "12.4.2 Torque limit function".)
(2) The zero point return retry function cannot be used with the “stopper stop
method 1).”
Precautions during operation
(1) Set a value in the " Pr.51 Zero point return dwell time" that is equal to or
higher than the movement time from the near-point dog ON to the time the
machine presses against the stopper.
(2) If the “ Pr.51 Zero point return dwell time” elapses during deceleration from
the “ Pr.48 Zero point return speed,” deceleration and stop are caused,
resulting in an error “dwell time fault” (error code: 205).
Machine zero point return start
(Positioning start signal)
ON
OFF
Zero point return speed
Valid torque limit range
Torque limit
Time out of
dwell time
ON
OFF
Zero point return request flag
OFF
Zero point return complete flag
ON
Standing by In zero point return Standing by
Axis operation status
Inconsistent
0
Movement amount
after near-point dog ON
Inconsistent
Value the machine moved is stored Zero point address
Current feed value
V
Near-point dog
ON
OFF
Deviation counter clear output
t
Status : b3
Status : b4
Md.40
Md.40
Md.44
Md.29
Md.30
Pr.48
Md.35
Stopper
Machine feed value
Dwell time measurement
Fig. 8.4 Operation when the dwell time elapses during deceleration from the zero point return
speed
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