Clearance Control With Variable Upper Limit - Siemens SINUMERIK 840Di sl Function Manual

5.3.1

Clearance control with variable upper limit

Example of polynomial with dyn. upper limit
For the purpose of clearance control, the upper limit of the output ($AA_OFF, override value
in axis V) is varied as a function of the spindle override (analog input 1). The upper limit for
polynomial 1 is varied dynamically as a function of analog input 2.
Polynomial 1 is defined directly via system variables:
Figure 5-1
$AC_FCTLL[1]=0.2
$AC_FCTUL[1]=0.5
$AC_FCT0[1]=0.35
$AC_FCT1[1]=1.5 EX-5
STOPRE
...
ID=1 DO $AC_FCTUL[1]=$A_INA[2]*0.1+0.35
ID=2 DO SYNFCT(1, $AA_OFF[V], $A_INA[1])
...
Synchronized actions
Function Manual, 11/2006, 6FC5397-5BP10-2BA0
Clearance control with variable upper limit
5.3 Examples of adaptive control
; Lower limit
; Request Value of upper limit
; Zero passage a
0
; Pitch a
1
; see following note
; Upper limit
adjust dynamically via
;
Analog input 2, no condition
;
; Clearance control through override
no conditions
;
Examples
135