Mitsubishi A1SD75P1-S3, User Manual

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MELSEC-A
8 ZERO POINT RETURN CONTROL
8.2.5 Zero point return method (3): Stopper stop method 2)
The following shows an operation outline of the "stopper stop method 2)" 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.
(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.
5)
The pulse output from the AD75 will stop at the zero point signal after the machine stops, 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.
t
ON
OFF
ON
OFF
OFF
ON
0
V
ON
Zero point signal
1)
2) 3) 4)
Pr. 48 Zero point return speed
Pr. 49 Creep speed
Stops at stopper
6) 5)
Valid torque limit range
Near-point dog OFF
Torque limit
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
Value the machine moved is stored
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
Standing by
Zero point address
Fig. 8.6 Stopper stop method 2) machine zero point return
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