Mitsubishi A1SD75P1-S3, User Manual

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MELSEC-A
8 ZERO POINT RETURN CONTROL
8.2.6 Zero point return method (4): Stopper stop method 3)
The following shows an operation outline of the "stopper stop method 3)" zero point
return method.
The "stopper stop method 3)" method is effective when a near-point dog has not been
installed. (Note that the operation is carried out from the start at the " Pr.49 Creep
speed", so it will take some time until the machine zero point return completion.)
Operation chart
1)
The machine zero point return is started.
(The machine moves at the "
Pr.49
Creep speed", in the direction designated in "
Pr.46
Zero point return direction".
Torque limiting is required at this time. If the torque is not limited, the servomotor may fail when the machine presses
against the stopper in step 2.)
2) The machine presses against the stopper at the "
Pr.49
Creep speed" and stops.
3)
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.
4)
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
V
0
Pr. 49 Creep speed
Valid torque limit range
Machine zero point return start
(Positioning start signal)
Deviation counter clear output
Md.35 Axis operation status
Standing by
Inconsistent 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
Zero point address
In zero point return
Standing by
Inconsistent
Zero point signal
Torque limit
Stops at stopper
Fig. 8.9 Stopper stop method 3) machine zero point return
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