Siemens SINUMERIK 840Di sl Function Manual page 53

The
ID = 1 DO SYNFCT(1, $AC_VC[x],
$AA_LOAD[x])
Multiplicative control
In case of the multiplicative control, the F Word is multiplied with a factor (override in case of
adaptive control). F
Variable $AC_OVR that acts as a
the real-time variable output.
Example of multiplicative control
The programmed feedrate (axial- or path-related) must be subject to multiplicative control as
a function of the drive load. The operating point is set to 100% at 30% drive load. The
axis(axes) must stop at 80% drive load. An excessive velocity corresponding to the
programmed value +20% is permissible.
Figure 2-6
Determination of the coefficients, see also Chapter "FCTDEF":
y = f(x) = a
a1 = - 100% / (80% -30%) = -2
a0 = 100+ (2 * 30) = 160
a2 = 0 (not a square component)
a3 = 0 (not a square component)
Upper limit = 120
Synchronized actions
Function Manual, 11/2006, 6FC5397-5BP10-2BA0
adaptive control
function is activated with the following synchronized action:
= F
active
Example of multiplicative control
+ a x +a x + a
2
0 1 2
; the additive offset value for the feedrate of the x axis is
calculated in each interpolation cycle from the percentage
utilization value of the drive via the polynomial 1
_ Factor
programmed AC
multiplicative
factor on the machining process is used as
x
3
3
Detailed description
2.4 Actions in synchronized actions
53