Zero Point Return Method (1): Near-Point Dog Method - Mitsubishi Electric A1SD75P1-S3 User Manual

8 ZERO POINT RETURN CONTROL

8.2.3 Zero point return method (1): Near-point dog method

The following shows an operation outline of the "near-point dog method" 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 "
After the near-point dog turns OFF, the pulse output from the AD75 will stop at the first zero point signal, outputting a
4)
"deviation counter clear signal" to the drive unit.
After a "deviation counter clear signal" 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 (
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
Pr.49
Creep speed", and subsequently moves at that speed.
Pr. 48 Zero point return speed
V
1)
Near-point dog
Zero point signal
ON
OFF
ON
OFF
OFF
Standing by
In zero point return
0
Inconsistent
Inconsistent
Value the machine moved is stored
Fig. 8.2 Near-point dog method machine zero point return
Zero point return acceleration time selection", in the
Pr.53
Md.40
Status: b3) turns from ON to OFF.
Deceleration at the near-point dog ON
Pr. 49 Creep speed
t
2) 3) 4) 5)
Md.44 Movement amount after near-point dog ON
Adjust so the near-point dog OFF position is
ON
as close as possible to the center of the zero
OFF
point signal HIGH level.
If the near-point dog OFF position overlaps
with the zero point signal, the zero point return
stop position may deviate by one servomotor
rotation.
One servomotor rotation
ON
Standing by
Value of *1.
Zero point address
8 - 6
MELSEC-A
Zero point return speed" when
Pr.48
Status: b4)
Md.40
* 1