Technical Manual TNC 360 - heidenhain - DR. JOHANNES ...

Kink point:
For machines with high rapid traverse rates it is usually not possible to raise the kv 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 kv at lower positioning speeds, i.e. a larger voltage step per µm of positional deviation
– a low kv 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
kv factor is multiplied by the factor from MP1820.
U [V]
9
MP1830
MP1810 (= kv)
MP1810 · MP1820
The kink point must lie above the range of machining feeds!
Under these conditions, the lag can be calculated as follows:
sa = Ve
k v
· MP1830 [%] [
]
+ 100 [%] – MP1830 [%]
100 [%] MP1820 · 100 [%]
MP1820 Multiplication factor for the Kv factor
Input value 0.001 to 1
MP1830 Kink point
Input value 0 to 100 [%]
4-58 TNC 360 3 Servo Positioning of the NC Axes 8/95
sa