Commissioning
4.17 Editing the valve characteristic
Hydraulic Drive
System Manual, 04/2015, 6SL3097-4BA00-0BP1
101
Linearization of the valve
An inverse characteristic is applied to compensate the non-linear characteristic of valves with
fine control range. The transition for real valves is rounded. For this reason, the transition
range in the compensation is also rounded. The rounding is based on a root characteristic in
such a way that the intersection points lie on a continuous tangent; the rounding range can
be set as required.
The transition point is defined by the percentage for input (voltage) and output (volume flow).
● Valve characteristic with transition in the zero range
To calculate the inverse characteristic, a transition point is specified in the positive zero
range of the valve characteristic with p1833 and p1834 and in the negative zero range
with p1836 and p1837.
The positive valve flow rate at the transition point in relation to the rated flow rate is
entered in p1833 and the negative value in p1836.
The positive valve voltage at the transition point in relation to the rated valve voltage is
entered in p1834 and the negative value in p1837.
With the factory setting "0" in p1834, there is no transition in the positive zero range. With
the factory setting "0" in p1837, there is no transition in the negative zero range.
The rounding range is parameterized in p1835.
● Valve characteristic with transition point in the fine control range
To calculate the inverse characteristic, the transition point is specified in the positive
quadrant of the valve characteristic with p1839 and p1840 and in the negative quadrant
with p1842 and p1843.
The positive valve volume flow at the transition point in relation to the rated volume flow is
entered in p1839 and the negative value in p1842.
The positive valve voltage at the transition point in relation to the rated valve voltage is
entered in p1840 and the negative value in p1843.
With equal values (default value) in p1839 and p1840, the characteristic is linear, with no
transition in the zero range (default value) and no saturation (default value).
This transition point data is preset from the valve data (p0205, p0206) using "Calculate
controller data". It can be changed later. The rounding range is not valve data and is
therefore only preset to a default value. It can however be changed later with the p1841
data. If necessary, a measurement can be taken to obtain a precise setting.
Note
A constant machining velocity of the drive directly at the transition point of the valve is not
recommended.
To Next Page
Loading...
