Machine Opr Control; Outline Of The Machine Opr Operation - Mitsubishi Electric MELSECQ Series User Manual

8 OPR CONTROL

8.2 Machine OPR control

8.2.1 Outline of the machine OPR operation

8
8 - 2
Downloaded from ManualsNet.com
Important
(1) Always set the OP in the same direction as viewed from any position in the
workpiece moving area (set the OP near the upper or lower limit of the
machine).
(2) Correctly set the OPR direction as the direction in which the workpiece moves
toward the OP.
(3) When the following two conditions hold, operation is performed at the OPR
speed since the near-point dog is not detected at a machine OPR control start.
• Machine OPR control is started in the position where the near-point dog is
OFF.
• The near-point dog does not exist in the OPR direction as seen from the
position where machine OPR control is started.
In such a case, perform JOG operation to move the axis to the position where
the near-point dog exists in the OPR direction and the near-point dog is OFF.
(Refer to Chapter 10 for details of JOG operation.)
(4) In deceleration operation from the OPR speed, the data used as the
deceleration time differs between "deceleration made by turning ON the near-
point dog" and "deceleration made by turning ON the axis stop signal".
(Refer to "Section 4.3 List of OPR data" for details.)
Make setting with full consideration given to the influence on the machine.
Machine OPR operation
In a machine OPR control, a near-point dog and zero signal are used to establish a
machine OP.
None of the address information stored in the QD70, programmable controller CPU,
or drive unit is used at this time. The position mechanically established after the
machine OPR control is regarded as the "OP" to be the starting point for positioning
control.
The method for establishing an "OP" by a machine OPR control differs according to
the method set in " OPR. 1 OPR method".
The following shows the operation when starting machine OPR control.
The machine OPR control is started.
1)
The operation starts according to the speed and direction set in the OPR data ( OPR. 1 to
2)
OPR. 9 ).
The "OP" is established by the method set in " OPR. 1 OPR", and the machine stops. (Refer to
3)
sections "8.2.2" to "8.2.8")
If "a" is set as " OPR. 3 OP address", "a" will be stored as the current position in the " Md. 1
4)
Current feed value" which is monitoring the position.
The machine OPR control is completed.
5)
Refer to "Section 4.3 List of OPR data" for details of OPR data.
The "OPR. 3 OP address" is a fixed value set by the user.
search engine
M
OP
Near-point dog
Fig. 8.1 Example of a machine OPR control
MELSEC-Q
Machine OPR control
8 - 2