Mitsubishi Electric MELSEC-L LD75D, Руководство пользователя

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CHAPTER 8 OPR CONTROL
8
8.
2 Mac
hine
O
P
R
8.2.8
OPR method (6): Count method 2)
The following shows an operation outline of the "count method 2)" OPR method.
The "count method 2)" method is effective when a "zero signal" cannot be received. (Note that compared to the "count
method 1)" method, using this method will result in more deviation in the stop position during machine OPR.)
In the "count method 2)", as well as in the "count method 1)", machine OPR can be performed even in the following
situations:
• when near-point dog is ON
• after completion of a machine OPR
(1) Operation chart
1.
The machine OPR is started. (The machine begins the acceleration designated in "[Pr.51] OPR
acceleration time selection", in the direction designated in "[Pr.44] OPR direction". It then moves
at the "[Pr.46] OPR speed" when the acceleration is completed.)
2.
The machine begins decelerating when the near-point dog ON is detected.
3.
The machine decelerates to the "[Pr.47] Creep speed", and subsequently moves at that speed.
4.
The pulse output from the LD75 will stop and the machine OPR will be completed when the
machine moves the movement amount set in "[Pr.50] Setting for the movement amount after near-
point dog ON " from the near-point dog ON position.
t
V
ON
OFF
ON
OFF
ON
ON
OFF
0
OFF
1. 2. 3. 4.
OPR speed
Movement amount after near-point dog ON
*
Creep speed
Near-point dog
Standby
OPR
Standby
Axis operation status
Inconsistent
Movement amount
after near-point dog ON
Inconsistent Value the machine moved is stored OP address
Current feed value
Value of *
OPR request flag
OPR complete flag
Md.31
Md.31
Md.26
Md.34
Md.20
Md.21
Pr.46
Pr.47
Md.34
Machine feed value
Setting for the movement amount
after near-point dog ON
Leave sufficient distance from
the OP position to the near-point
dog OFF
Machine OPR start
(Positioning start signal)
[Y10,Y11,Y12,Y13]
Status: b3
Status: b4
Pr.50