Mitsubishi A1SD75P1-S3, User Manual

Page: 283 / 622

8 - 8
MELSEC-A
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.
Operation chart
1)
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
" 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.
(Torque limiting is required at this time. If the torque is not limited, the servomotor may fail in step 4).)
3) The machine decelerates to the " Pr.49 Creep speed", and subsequently moves at that speed.
4) The machine presses against the stopper at the creep speed and stops.
5)
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,
outputting the "deviation counter clear output" to the drive unit.
6)
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
to ON, and the zero point return request flag ( Md.40 Status: b3) turns from ON to OFF.
0
t
ON
OFF
Valid torque limit range
Torque limit
Dwell time measurement
Time out of dwell time
ON
OFF
OFF
ON
V
ON
1) 2) 3) 4) 5) 6)
Range in which the servomotor rotation
is forcibly stopped by the stopper
Near-point dog OFF
Machine zero point return start
(Positioning start signal)
Deviation counter clear output
Md.35 Axis operation status Standing by
Inconsistent
Inconsistent
In zero point return Standing by
Zero point address Value the machine moved is stored
Pr. 48 Zero point return speed
Pr. 49 Creep speed
Zero point return request flag
[ Md.40 Status : b3]
Zero point return complete flag
[ Md.40 Status : b4]
Md.44 Movement amount
after near-point dog ON
Md.29 Current feed value
Md.30 Machine feed value
Stopper
Fig. 8.3 Stopper stop method 1) machine zero point return
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com