Lenze EVS9332xK - Manual (Page 162)

Function library
Function blocks
3.2.38 Characteristic function (CURVEC)
3−134
l
EDSVS9332K−EXT EN 4.0
Profiles with relative feed
Profiles with relative feed are used in continuous drives. The final value of such profiles is not identical
with its initial position.
Continuous drives are for instance:
l conveyor belts
l rotary tables with feed along the entire revolution.
This function is selected with CURVEC1−REL−SEL = HIGH (e.g. FIXED 1)
Example 1 Example 2
Y
X
L
Y
X
L L L
REL_VOR1 REL_VOR2
L Profile length
With CURVEC1−REL−SEL = LOW, the last Y value of the profile will not be stored!
(
STOP!
Depending on the cam profile data, this setting may result in a ’jump’ of the drive to
the new value (see fig. below).
Y
X
L L L
REL_VOR3
L Profile length
Negative input values
A fault is indicated for negative input values (X<0):
l CURVEC1−X < 0 = HIGH
Furthermore, the output will show the y value which would result from the profile function for x=0.