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MELSEC-Q
8 OPR CONTROL
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.
(3) When the stop signal stops the machine OPR, carry out the machine OPR
again. When restart command is turned ON after the stop signal stops the
OPR, the error "OPR restart impossible (error code: 209)" will occur.
(4) After the home position return (OPR) has been started, the zero point of the
encoder must be passed at least once before point A is reached.
However, if selecting "1: It is not necessary to pass through the Z phase after
the power on." with "
Pr.180
Function selection C-4", it is possible to carried
out the home position return (OPR).
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. 8.6 Count method 1) machine OPR on the near-point dog ON position