Mitsubishi QD75P1N User Manual page 310

8 OPR CONTROL
Near-point dog OFF
Zero signal
Fig. 8.13 Count method 1) machine OPR on the near-point dog ON position
Restrictions
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 "
amount after near-point dog ON" is smaller than the deceleration distance
from the " Pr.46
(2) If the speed is changed to a speed faster than "
speed change function (refer to "12.5.1 Speed change function".) during a
machine OPR, the distance to decelerate to "
be ensured, depending on the setting value of "
movement amount after near-point dog ON". In this case, the error "Count
method movement amount fault" (error code: 206) occurs and the Machine
OPR is stopped.
(3) 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)
3)
2)
ON
OPR speed" to " Pr.47
[Operation when a machine OPR is started at
the near-point dog ON position]
5)
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
"
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
"
after near-point dog ON" on detection of the
near-point dog signal ON.
8 - 18
Pr.50 Setting for the movement
Creep speed".
Pr.46
OPR speed" by the
Pr.47
Creep speed" may not
Pr.50 Setting for the
Pr.39 Stop group 3 sudden stop
Pr.50
Setting for the movement amount
MELSEC-Q