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Compensation (K3)
11.4 Following error compensation (feedforward control)
Turning, Milling, Nibbling
226
Function Manual, 11/2012, 6FC5397-1CP10-5BA0
11.4
Following error compensation (feedforward control)
11.4.1
General
Axis-specific following error
The following error can be reduced to almost zero with the help of the feedforward control.
This feedforward control is therefore also called "following error compensation".
Particularly during acceleration in contour curvatures, e.g. circles and corners, this following
error leads to undesirable, velocity-dependent contour violations. The SINUMERIK 802D sl
control is equipped with the "Speed feedforward control" feedforward control type.
Activation/deactivation in part program
The feedforward control can be activated and de-activated by means of the following high-
level language elements in the part program:
●
FFWON - Feedforward control ON
●
FFWOF - Feedforward control OFF (activation setting)
With MD32630 FFW_ACTIVATION_MODE, the activation (via FFWON) or de-activation (via
FFWOF) of a specific axis can be determined:
●
FFWON and FFWOF are used to activate and de-activate respectively the feedforward
control of all axes/spindles for which MD32630=1 is set.
●
MD 32630 should therefore have identical settings for axes that interpolate with each
other.
The feedforward control should only be switched on or off while the axis/spindle is stationary
to prevent jerk. This is the responsibility of the programmer.
Conditions
The following points should be noted before the feedforward control is applied:
●
Rigid machine behavior
●
Precise knowledge about the machine dynamic response
●
No sudden changes in the position and speed setpoints
Содержание SINUMERIK 802D sl
Страница 58: ...Axis Monitoring A3 2 6 Data lists Turning Milling Nibbling 58 Function Manual 11 2012 6FC5397 1CP10 5BA0 ...
Страница 84: ...Travel to fixed stop F1 5 6 Data lists Turning Milling Nibbling 84 Function Manual 11 2012 6FC5397 1CP10 5BA0 ...
Страница 114: ...Gantry axes G1 6 8 Data lists Turning Milling Nibbling 114 Function Manual 11 2012 6FC5397 1CP10 5BA0 ...
Страница 260: ...Measurement M5 13 6 Data lists Turning Milling Nibbling 260 Function Manual 11 2012 6FC5397 1CP10 5BA0 ...
Страница 314: ...Positioning Axes P2 17 3 Data lists Turning Milling Nibbling 314 Function Manual 11 2012 6FC5397 1CP10 5BA0 ...
Страница 332: ...Reference Point Approach R1 18 6 Data lists Turning Milling Nibbling 332 Function Manual 11 2012 6FC5397 1CP10 5BA0 ...
Страница 340: ...Rotary Axes R2 19 4 Data lists Turning Milling Nibbling 340 Function Manual 11 2012 6FC5397 1CP10 5BA0 ...
Страница 368: ...Spindle S1 20 9 Data lists Turning Milling Nibbling 368 Function Manual 11 2012 6FC5397 1CP10 5BA0 ...
Страница 390: ...Tangential Control T3 22 5 Data lists Turning Milling Nibbling 390 Function Manual 11 2012 6FC5397 1CP10 5BA0 ...
Страница 422: ...Feed V1 24 4 Data lists Turning Milling Nibbling 422 Function Manual 11 2012 6FC5397 1CP10 5BA0 ...
Страница 440: ...Appendix A 2 Overview Turning Milling Nibbling 440 Function Manual 11 2012 6FC5397 1CP10 5BA0 ...
Страница 458: ...Glossary Turning Milling Nibbling 458 Function Manual 11 2012 6FC5397 1CP10 5BA0 ...