Mitsubishi A1SD75P1-S3, User Manual

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8 - 12
MELSEC-A
8 ZERO POINT RETURN CONTROL
Restrictions
(1) Always limit the servomotor torque after the " Pr.49 Creep speed" is reached.
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) Use an external input signal as the zero point signal.
(3) In the "stopper method 2)", the zero point return retry function is unusable.
Precautions during operation
(1) Input a zero point signal from an external source after the machine presses
against the stopper.
The workpiece will continue decelerating and stop if a zero point signal is input
before deceleration to the " Pr.49 Creep speed". An error " zero point
detection timing fault (error code: 204)" will occur after the machine stops.
(2) The near-point dog must be kept turned ON until contact with the stopper.
t
ON
OFF
Zero point return speed
Torque limit
ON
OFF
OFF
ON
V
Near-point dog
ON
OFF
Zero point signal
Standing by In zero point return
Standing by
Inconsistent
0
Inconsistent Value the machine moved is stored zero point address
Pr.48
Stopper
Valid torque limit range
Machine zero point return start
(Positioning start signal)
Devision counter clear output
Axis operation status
Movement amount
after near-point dog on
Current feed value
Md.35
Md.44
Md.29
Md.30 Machine feed value
Zero point return request flag
Md.40
Status : b3
Zero point return complete flag
Status : b4
Md.40
Fig. 8.7 Operation when a zero point signal is input before the creep speed is reached
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