Mitsubishi Electronics QD75P, QD75D OPR method 5 Count method1, OPR direction. It then moves at

8 OPR CONTROL

8.2.7 OPR method (5): Count method1)

MELSEC-Q

The following shows an operation outline of the "count method 1)" OPR method. In the "count method 1)" machine OPR, the following can be performed:

•Machine OPR on near-point dog ON

•Second machine OPR after completion of first machine OPR

Operation chart

The machine OPR is started.
(The machine begins the acceleration designated in "				OPR acceleration time selection", in the direction
			Pr.51
1)
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.

On detection of the first zero signal after the axis has traveled the movement amount set in " Pr.50 Setting for the

4)movement amount after near-point dog ON" after near-point dog ON, the pulse output from the QD75 stops and the "deviation counter clear output" is output to the drive unit.

5)

(A "deviation counter clear signal output time" is set in Pr.55 .)

After a "deviation counter clear output" 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.

V

Pr. 46 OPR speed

Pr. 50 Setting for the movement amount after near-point dog ON

Pr. 47 Creep speed

t

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.

	Md.34 Movement amount after near-point dog ON 1
		Leave sufficient distance from the zero point
ON		position to the near-point dog OFF

Near-point dog OFF

First zero signal after travel of the movement amount set to " Pr. 50 Setting for the movement

amount after near-point dog ON"

Zero signal

One servomotor rotation

ON

Machine OPR start	OFF
(Positioning start signal)
	ON
OPR request flag	OFF
[ Md.31 Status : b3]
	ON
OPR complete flag	OFF
[ Md.31 Status : b4]
Deviation counter clear output

Pr.55 Deviation counter clear signal output time

Md.26 Axis operation status	Standing by	In OPR	Standing by
		0
Movement amount	Inconsistent		Value of 1.
after near-point dog ON
Md.20 Current feed value
	Inconsistent	Value the machine moved is stored	OP address

Md.21 Machine feed value

Fig. 8.12 Count method1) machine OPR

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