Mitsubishi Electric MELSEC-L LD75D, Руководство пользователя

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8.2.7
OPR method (5): Count method 1)
The following shows an operation outline of the "count method 1)" OPR method.
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.
On detection of the first zero signal after the axis has traveled the movement amount set in "[Pr.50]
Setting for the movement amount after near-point dog ON" after near-point dog ON, the pulse
output from the LD75 stops and the "deviation counter clear output" is output to the drive unit. (A
"deviation counter clear signal output time" is set in [Pr.55].)
5.
After a "deviation counter clear signal" is output to the drive unit, the OPR complete flag ([Md.31]
Status: b4) turns from OFF to ON and the OPR request flag ([Md.31] Status: b3) turns from ON to
OFF.
0
1. 2. 3. 4. 5.
t
ON
OFF
OFF
OFF
ON
V
ON
OFF
ON
OPR speed
Standby OPR Standby
Inconsistent
Movement amount
after near-point dog ON
Inconsistent
Value the machine moved is stored
OP address
Current feed value
Zero signal
Value of
*
Deviation counter clear output
Movement amount after near-point dog ON
Near-point dog
*
Creep speed
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
Pr.50
Setting for the movement amount
after near-point dog ON
Leave sufficient distance from the zero point position to
the near-point dog OFF
Adjust the setting for the movement amount after near-point dog ON to
be as near as possible to the center of the zero signal HIGH.
If the setting for the movement amount after near-point dog ON falls
within the zero signal, there may be produced an error of one
servomotor rotation in the machine OPR stop position.
First zero signal after travel of the movement amount set to
" Pr. 50 Setting for the movement amount after near-point
dog ON"
One servomotor rotation
Deviation counter clear
signal output time
Pr.55
Machine OPR start
(Positioning start signal)
[Y10,Y11,Y12,Y13]
Status: b3
Status: b4
Axis operation status