HEIDENHAIN TNC 335 Technical Manual - Manual (Page 155)

4-58
TNC 360 3 Servo Positioning of the NC Axes 8/95
Kink point:
For machines with high rapid traverse rates it is usually not possible to raise the k
v
factor enough to
give an optimal loop characteristic over the entire range of positioning speeds (stop, machining feed
rates, rapid traverse). In such cases one can introduce a kink point, which gives the following
advantages:
– a high k
v
at lower positioning speeds, i.e. a larger voltage step per µm of positional deviation
– a low k
v
at higher positioning speeds (above the machining rates).
The position of the kink point is determined by machine parameter MP1830. In the upper range the
k
v
factor is multiplied by the factor from MP1820.
MP1810 · MP1820
9
U [V]
sa
MP1810 (= kv)
MP1830
The kink point must lie above the range of machining feeds!
Under these conditions, the lag can be calculated as follows:
s
a
=
Ve
k
v
·
[
MP1830 [%] + 100 [%] – MP1830 [%]
]
100 [%] MP1820 · 100 [%]
MP1820 Multiplication factor for the K
v
factor
Input value 0.001 to 1
MP1830 Kink point
Input value 0 to 100 [%]