Circular Interpolation Operation; Circular Interpolation [Center Coordinate Specification] - Mitsubishi FX3U-20SSC-H User Manual

FX -20SSC-H Positioning Block User's Manual
3U
9.11

Circular Interpolation Operation

The circular interpolation operation is a positioning procedure, available only in the table operation.
The circular interpolation operation has the center coordinate specification/radius specification formats.
For details on controlling by table operation, and changing the operation speed, refer to the following sections.
→ For details on the related parameters, control data, and monitor data, refer to Subsection 9.13

9.11.1 Circular interpolation [center coordinate specification]

The work piece moves from the start point to the target address, following the circular arc locus around the
specified center coordinate.
1. Operation
Target address 1 (X,Y axis)
CW
(Clockwise)
START point
1) Set table information, X-axis speed, X/Y axis position (address) information and center coordinate in the
XY table information.
2) When turning the X-axis START command ON at the table operation start number with the specified
circular interpolation (center, CW direction) / (center, CCW direction), the work piece moves to the target
position at the specified speed, following the circle's center coordinate.
3) The work piece stops at the XY coodinate in target address 1, and the operation ends, turning the
positioning completion signal ON.
Note
• The center coordinate is always handled as a relative address from the start point.
• When setting the same address for the start and target points, the work piece moves in a perfect circle.
The center coordinate specification is available in the perfect circle operation.
• Pulse rate and feed rate
Set ratios that are the same for the pulse rate to the feed rate for the X-axis and the Y-axis if the version is
earlier than Ver.1.20. Set the interpolation gear ratio selection function in the X- axis, Y-axis when the ratio
of the pulse rate to the feed rate differs between the X-axis and the Y-axis for versions Ver.1.20 or later.
• During continuous pass operation
If the circular path is too short and the travel time from the start point to the target point is shorter than the
interpolation time constant, the operation temporarily stops and shifts to the next interpolation operation.
• When interpolation operations are consecutively repeated in a table operation, the 20SSC-H provides
continuous pass operation.
98
→ For details on the operation speed change, refer to Section 7.6
→ For details on the radius specification, refer to Subsection 9.11.2
CCW
(Counterclockwise)
Center (i,j)
START command
Positioning completion
→ For details on the interpolation gear ratio selection, refer to Subection 7.10.3
→ For details on the continuous pass operation, refer to Section 10.10
→ For details on the table operation, refer to Chapter 10
→ For details on the torque limit, refer to Subsection 7.8.3
→ For details on the STOP command, refer to Section 7.4
Interpolation
time constant
Speed
ON
OFF
ON
OFF
9 Positioning Control
9.11 Circular Interpolation Operation
Interpolation
time constant
Maximum speed
Vector speed
(operation speed 1
of X axis)
Target address
(X,Y axis)
Time
ON