HEIDENHAIN iTNC 530 HSCI - Characteristic Curve Kink Point (for Control with Following Error)

July 2013 6.8 The control loop 843
Characteristic curve
kink point (for
control with
following error)
For machines with high rapid traverse, you can not increase the k
v
factor
enough for an optimum control response to result over the entire velocity
range (from standstill to rapid traverse).
In this case you can define a characteristic curve kink point, which has the
following advantages:
 High k
v
factor in the low range
 Low k
v
factor in the upper range (beyond the machining velocity range)
 Define the position of the characteristic kink with MP1830.x. In the upper
range, the k
v
factor is multiplied by the factor from MP1820.x.
 Enter a multiplier in MP1820.
The characteristic curve kink point must lie above the tool feed rate!
Calculating the lag (following error):
MP1820.x Multiplier for the k
v
factor
Input: 0.001 to 1.00000
MP1830.x Characteristic curve kink point
Input: 0.000 to 100.000 [%]
MP1810 · MP1820
9
U [V]
sa
MP1810 (= k
v
)
MP1830
s
a
MP1830.x [%]
100 [%]
---------------------------------------------
100 [%] MP1830.x [%]–
MP1820.x 100 [%]⋅
------------------------------------------------------------------------------+


v
e
k
v
-------
⋅=