Mitsubishi Electronics QD75D, QD75P user manual OPR method 3 Stopper method

8 OPR CONTROL

8.2.5 OPR method (3): Stopper method 2)

MELSEC-Q

The following shows an operation outline of the "stopper method 2)" OPR method.

Operation chart

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

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.
	(Torque limiting is required at this time. If the torque is not limited, the servomotor may fail in step 4).)

4)The machine presses against the stopper at the creep speed and stops.

The pulse output from the QD75 will stop at the zero signal after the machine stops, outputting the "deviation counter clear output" to the

5)drive unit.

(A "deviation counter clear signal output time" is set in the 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,

6)

and the OPR request flag ( Md.31 Status: b3) turns from ON to OFF.

		V	Pr. 46 OPR speed					Pr. 47 Creep speed
								Stops at stopper
		1)		2)	3)	4) 5)	6)	t
			Zero signal
					Valid torque limit range
			Torque limit
				ON
			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]
Deviation counter clear output							Pr.55 Deviation counter clear signal
								output time
Md.26 Axis operation status	Standing by		In OPR				Standing by
Md.34 Movement amount	Inconsistent		0
after near-point dog ON
Md.20 Current feed value	Inconsistent		Value the machine moved is stored				OP address
Machine feed value

Fig. 8.7 Stopper method 2) machine OPR

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