Mitsubishi Electronics QD75D, QD75P user manual Machine OPR method

8 OPR CONTROL

8.2.2 Machine OPR method

MELSEC-Q

The method by which the machine OP is established (method for judging the OP position and machine OPR completion) is designated in the machine OPR according to the configuration and application of the positioning method.

The following table shows the six methods that can be used for this OPR method.

(The OPR method is one of the items set in the OPR parameters. It is set in " method" of the basic parameters for OPR.)

Pr.43

OPR

OPR method

Pr.43

Operation details

Deceleration starts by the OFF

ON of the near-point dog. (Speed is reduced to

"

Pr.47

Creep speed".)

Near-point dog method

The operation stops at the first zero signal

after the near-point dog turns from ON

OFF. When a "deviation counter clear output" is completed, the machine OPR is

completed.

The stopper position is regarded as the OP.

After the deceleration starts by the OFF

ON of the near-point dog, the machine presses

Stopper method 1)

against the stopper at the "

Pr.47

Creep speed" and stops.

The machine OPR is regarded as completed on completion of the deviation counter clear

output provided after "

Pr.49

OPR dwell time" passed after stoppage.

The stopper position is regarded as the OP.

After the deceleration starts by the OFF

ON of the near-point dog, the machine presses

Stopper method 2)

against the stopper at the "

Pr.47

Creep speed" and stops.

The machine OPR is regarded as completed on completion of the deviation counter clear

output provided after the zero signal

is detected after stoppage.

The stopper position is regarded as the OP.

The machine starts at the "

Pr.47

Creep speed" from the beginning, then presses

Stopper method 3)

against the stopper at the "

Pr.47

Creep speed" and stops.

The machine OPR is regarded as completed on completion of the deviation counter clear

output provided after the zero signal

is detected after stoppage.

The deceleration starts by the OFF

ON of the near-point dog, and the machine moves

at the "

Pr.47

Creep speed".

after moving the distance set in the "

Count method 1)

The machine stops at the zero signal

Pr.50

Setting for the movement amount after near-point dog ON" from the near point dog OFF

ON position. When a "deviation counter clear signal output" is completed, the machine

OPR is regarded as completed.

The deceleration starts by the OFF

ON of the near-point dog, and the machine moves

at the "

Pr.47

Creep speed".

Count method 2)

The machine moves the distance set in the "

Pr.50

Setting for the movement amount

after near-point dog ON" from the near point dog OFF

ON position, and stops at that

position. The machine OPR is then regarded as completed.

: The following are the signals input as the zero signals of the QD75 in the corresponding OPR methods.

Near-point dog method, count method 1): Signal that is output as a single pulse at one motor revolution (e.g. Z-phase signal

	output from the drive unit)
Stopper method 2), 3)	: Signal that is output on detection of contact with the stopper. (Input externally)

REMARK

Creep speed

The stopping accuracy is poor when the machine suddenly stops from fast speeds. To improve the machine's stopping accuracy, its must change over to a slow speed before

stopping. This speed is set in the "

Pr.47

Creep speed".

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