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MELSEC-Q
8 OPR CONTROL
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 "
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".
(2) If the speed is changed to a speed faster than "
Pr.46
OPR speed" by the
speed change function (refer to "12.5.1 Speed change function".) during a
machine OPR, the distance to decelerate to "
Pr.47
Creep speed" may not
be ensured, depending on the setting value of "
Pr.50
Setting for the
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.
ON
1)
5)
4)
3)
2)
Zero signal
Near-point dog OFF
Pr. 50 Setting for the movement
amount after near-point dog ON
[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
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