Position Control; Additional Explanations - gefran KFM05a Instruction Manual

5.6 Position control

The following graphic illustrates how position control functions:
Motor frequency f depends on sign and magnitude of the position deviation:
VF-operation characteristic depends on the magnitude of position deviation:
The values in brackets are equivalent to "default file values" (standard values).

5.7 Additional explanations

Absolute-positioning means, the positioning-values relate to 0. In the reference point (mains on
resp. sensor or blockade) the internal position-detection is set to the value „Pos.0".
Example:
Pos.0 = 1000 = reference point, Pos.1 = 100, Pos.2 = 500
At relative-positioning the internal position detection („actual position") is set to 0 before every start.
Exception: after a finished reference motion (homing) resp. mains on it will be started with value
Pos.0.
!ATTENTION!
Do not use relative positioning for linear axis, because there is only a mechanically limited way of
motion! Absolute-positioning has a fixed reference point, at relative-positioning the reference point is the
respective start point.
Art.-No.: 918 111e
SIEI-AREG GmbH
Gottlieb-Daimler-Straße 17/3
74385 Pleidelsheim Germany
Fon: +49 7144 89736 0
f = position deviation × P-freq.
U = magnitude of position deviation × P-volt.
x
Page 45 von 60 Rev. 09/14