Zero Point Return Method (5): Count Method 1) - Mitsubishi A1SD75P1-S3 User Manual

8 ZERO POINT RETURN CONTROL

8.2.7 Zero point return method (5): Count method 1)

The following shows an operation outline of the "count method 1)" zero point return
method.
The machine zero point return is started.
(The machine begins the acceleration designated in "
1)
direction designated in "
the acceleration is completed.)
2) The machine begins decelerating when the near-point dog ON is detected.
3) The machine decelerates to the "
On detection of the first zero point signal after the axis has traveled the movement amount set in the "
4) the movement amount after near-point dog ON" after the near-point dog ON, the pulse output from the AD75 stops and
the "deviation counter clear output" is output to the drive unit.
After a "deviation counter clear output" is output to the drive unit, the zero point return complete flag (
5)
turns from OFF to ON, and the zero point return request flag (
Adjust the movement amount after
activation at the near-point dog to
the center of the high zero point
signal interval as far as possible.
If the movement amount setting
after activation at the near-point dog
interferes with the zero point signal,
the machine zero point return stopping
position may deviate by a revolution of
the servomotor.
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
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
Zero point return direction". It then moves at the "
Pr.46
Creep speed", and subsequently moves at that speed.
Pr.49
Pr. 48 Zero point return speed
V
1)
Near-point dog OFF
First zero point after travel by " Pr. 52
Setting for the movement amount
after near-point dog ON"
Zero point signal
ON
OFF
ON
OFF
OFF
Standing by In zero point return
0
Inconsistent
Inconsistent Value the machine moved is stored
Fig. 8.11 Count method1) machine zero point return
Zero point return acceleration time selection", in the
Pr.53
Status: b3) turns from ON to OFF.
Md.40
Pr. 52 Setting for the movement amount
after near-point dog ON
Pr. 49 Creep speed
t
2) 3) 4) 5)
Md.44 Movement amount after near-point dog ON
There is no problem even if deactivation at the
ON near-point dog occurs during machine zero point
return.
However, deactivation at the near-point dog
should be as far from the zero position as
possible, due to the following reason.
If deactivation at the near-point dog occurs at
One
the end of machine zero point return, the motor
servomotor
is not stopped in the second action until the upper
rotation
or lower limit is reached when repetitive machine
zero point return cycles occur. If the zero point
return retry function has been invalidated, an
error is caused upon detection of the limit.
ON
Standing by
Value of *1.
Zero point address
8 - 16
MELSEC-A
Zero point return speed" when
Pr.48
Setting for
Pr.52
Status: b4)
Md.40
* 1