Mitsubishi Electronics QD75P, QD75D user manual OPR method 6 Count method, Machine OPR is started

8 OPR CONTROL

8.2.8 OPR method (6): Count method 2)

MELSEC-Q

The following shows an operation outline of the "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.)

Operation chart

The machine OPR is started.

(The machine begins the acceleration designated in " Pr.51 OPR acceleration time selection", in the
1)	Pr.44 OPR direction". It then moves at the "	Pr.46 OPR speed" when the
direction designated in "

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. The pulse output from the QD75 will stop and the machine OPR will be completed when the machine

4)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.

Pr. 46 OPR speed

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

Creep speed

t

Md.34 Movement amount after near-point dog ON 1

	Leave sufficient distance from the OP
ON	position to the near-point dog OFF

Near-point dog OFF

		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]
Md.26 Axis operation status Standing by		In OPR	Standing by
Md.34 Movement amount	Inconsistent	0	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. 8.14 Count method 2) machine OPR

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