Mitsubishi Electric A1SD75P1-S3 User Manual page 282

8 ZERO POINT RETURN CONTROL
Machine zero point return start
(Positioning start signal)
Zero point return request flag
[ Md.40 Status : b3]
Zero point return complete flag
[ Md.40 Status : b4]
Md.35 Axis operation status
Md.44 Movement amount
after near-point dog ON
Md.29 Current feed value
Md.30 Machine feed value
Fig. 8.7 Operation when a zero point signal is input before the creep speed is reached
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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) A pulse generator with zero point signal is required. When the pulse generator
is not provided with a zero point signal, create a zero point signal with an
external 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.
OFF
OFF
OFF
Standing by
Inconsistent
Inconsistent
V
Pr. 48 Zero point return speed
Zero point signal
ON
Near-point dog OFF
ON
ON
In zero point return
0
Value the machine moved is stored
8 - 12
MELSEC-A
Pr. 49 Creep speed
Stopper
t
In error
Address at stop