Zero Point Return Method (2): Stopper Stop Method 1) - Mitsubishi Electric A1SD75P1-S3 User Manual

8 ZERO POINT RETURN CONTROL

8.2.4 Zero point return method (2): Stopper stop method 1)

The following shows an operation outline of the "stopper stop method 1)" zero point
return method.
The machine zero point return is started.
(The machine begins the acceleration designated in " Pr.53 Zero point return acceleration time selection", in the direction designated in
1)
" Pr.46 Zero point return direction". It then moves at the " Pr.48 Zero point return speed" when the acceleration is completed.)
2) The machine begins decelerating when the near-point dog ON is detected.
The machine decelerates to the " Pr.49 Creep speed", and subsequently moves at that speed.
3)
(Torque limiting is required at this time. If the torque is not limited, the servomotor may fail in step 4).)
4) The machine presses against the stopper at the creep speed and stops.
The pulse output from the AD75 will stop when the " Pr.51 Zero point return dwell time" has elapsed after the near-point dog turns ON,
5)
outputting the "deviation counter clear output" to the drive unit.
After a "deviation counter clear output" is output to the drive unit, the zero point return complete flag ( Md.40 Status: b4) turns from OFF
6)
to ON, and the zero point return request flag ( Md.40 Status: b3) turns from ON to OFF.
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]
Deviation counter clear output
Md.35 Axis operation status Standing by
Md.44 Movement amount
after near-point dog ON
Md.29 Current feed value
Md.30 Machine feed value
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Operation chart
V
Pr. 48 Zero point return speed
1)
Torque limit
Near-point dog OFF
ON
OFF
ON
OFF
OFF
In zero point return
Inconsistent 0
Inconsistent
Value the machine moved is stored
Fig. 8.3 Stopper stop method 1) machine zero point return
Pr. 49 Creep speed
Stopper
2) 3) 4) 5) 6)
Range in which the servomotor rotation
is forcibly stopped by the stopper
Valid torque limit range
ON
Dwell time measurement
8 - 8
MELSEC-A
t
Time out of dwell time
ON
Standing by
Zero point address