Siemens SINUMERIK 840D sl Function Manual page 69

F
active
<SysVar_Out>
$AC_VC
$AA_VC[axis]
Input value is the actual current value $AA_CURR of the X axis.
The operating point is set to 5 A.
The feedrate may be altered by ±100 mm/min and the axial current deviation may be ±1 A.
Figure 3-3
Determining the parameters of the FCTDEF function:
FCTDEF(<Poly_No>,<Lo_Limit>,<Up_Limit>,a
<Poly_No>:
<Lo_Limit>:
<Up_Limit>:
a :
0
a
1
a
2
a
3
Calculation of the override value:
SYNFCT(<Poly_No>,<SysVar_Out>,<SysVar_In>)
<Poly_No>:
<SysVar_Out>:
<SysVar_In>:
Programming:
Program code
N100 FCTDEF(1, -100, 100, 500, -100)
Synchronized actions
Function Manual, 08/2018, 6FC5397-5BP40-6BA2
= F + F
programmed AC
Meaning
additive path feedrate override
additive axial feedrate override
Example: Additive control of path feed
= 1 (example)
= -100
= 100
Polynomial: f(x) = a
1 / 100 = 5 / a
= 100 mm/min / -1 A = -100 [mm/min / A]
= 0 (not a square component)
= 0 (not a cubic component)
= 1
$AC_VC (additive path feedrate override)
$AA_CURR (drive actual current value)
3.7 Actions in synchronized actions
,a ,a
0 1
+ a x +a x + a x
2
0 1 2 3
⇒ a = 500
0 0
Detailed description
,a )
2 3
3
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