Siemens SINUMERIK 828D Function Manual page 71

Example: Multiplicative override of the path feedrate
The programmed feedrate is multiplied by a percentage factor (additional override):
F
active
<SysVar_Out>
$AC_OVR
Input value is the percentage drive load $AA_LOAD of the X axis.
The operating point is set to 100% at 30% drive load.
The axis must stop at 80% load.
An excessive velocity corresponding to the programmed value +20% is permissible.
Figure 2-4
Determining the parameters of the
FCTDEF(<Poly_No>,<Lo_Limit>,<Up_Limit>,a
<Poly_No>
<Lo_Limit>
<Up_Limit>
a :
0
a
1
a
2
a
3
Synchronized actions
Function Manual, 07/2012, 6FC5397-5BP40-3BA0
= F * Factor
programmed AC
Meaning
Path override can be specified via synchronized action
Example: Multiplicative control
: = 2 (example)
: = 0
: = 120
Polynomial: f(x) = a
50 / 100 = 80 / a
= 100 % / -50 % = -2
= 0 (no square component)
= 0 (no cubic component)
function:
FCTDEF
,a ,a ,a )
0 1 2 3
+ a x +a x + a
2
0 1 2
⇒ a = 160
0 0
Detailed description
2.7 Actions in synchronized actions
x
3
3
71