Mitsubishi Electronics QD75D, QD75P user manual OPR speed to, Pr.50, Pr.46

8 OPR CONTROL

Restrictions

MELSEC-Q

A pulse generator with a zero signal is required.

When using a pulse generator without a zero signal, generate a zero signal using an external signal.

Precautions during operation

(1) An error "Count method movement amount fault (error code: 206)" will occur

and the operation will not start if the "

Pr.50

Setting for the movement

amount after near-point dog ON" is smaller than the deceleration distance

from the "

Pr.46

OPR speed" to "

Pr.47

Creep speed".

A deceleration stop will be carried out if the speed is changed during the operation and an error occurs.

(2)The following shows the operation when a machine OPR is started while the near-point dog is ON.

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

4) 1) 5)

3)

2)

ON

Near-point dog OFF

Zero signal

[Operation when a machine OPR is started at the near-point dog ON position]

1)A machine OPR is started.

2)The machine moves at the OPR speed in the opposite direction of an OPR.

3)Deceleration processing is carried out by " Pr.39 Stop group 3 sudden stop

selection" when the near-point dog OFF is detected.

4) After the machine stops, a machine OPR is carried out in the OPR direction.

5) The machine OPR is completed after the deviation counter clear output is provided on detection of the first zero signal after the travel of the movement amount set to

" Pr.50 Setting for the movement amount

after near-point dog ON" on detection of the near-point dog signal ON.

Fig. 8.13 Count method 1) machine OPR on the near-point dog ON position

(3)Turn OFF the near-point dog at a sufficient distance from the OP. Although there is no harm in operation if the near-point dog is turned OFF during a machine OPR, it is recommended to leave a sufficient distance from the OP when the near-point dog is turned OFF for the following reason.

If machine OPRs are performed consecutively after the near-point dog is turned OFF at the time of machine OPR completion, operation will be performed at the OPR speed until the hardware stroke limit (upper/lower limit)

is reached.

(4)When a machine OPR is stopped with the stop signal, perform a machine OPR again.

If the restart command is turned ON after a stop with the stop signal, an error "OPR restart not possible" (error code: 209) occurs.

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