Commissioning
4.17 Editing the valve characteristic
Hydraulic Drive
80 System Manual, 04/2015, 6SL3097-4BA00-0BP1
Editing the valve characteristic
4.17.1
Every servo solenoid valve has an individual characteristic, which represents the flow rate
with respect to the control voltage (valve opening as a percentage). This characteristic must
be measured after commissioning an HLA module and must be set in the drive. After the
measurement, you have the option to automatically adapt the characteristic approximated in
the drive using straight lines and parabolas to the measured characteristic using an
optimization algorithm. In addition, you can adapt the characteristic more precisely to the
measured characteristic manually (and graphically) or by directly entering values. The quality
of the match will be quite apparent when viewing the graphic display of both characteristics.
A measured characteristic is stored in the drive, simply defined section-by-section using
straight lines and parabolic segments. The simplified characteristic is configured using the
following parameters:
Figure 4-23 Measured characteristic → SINAMICS parameters
The calculated characteristic starts at the zero point and comprises short straight lines (zero
range). Rounded off by a parabola, this range transitions into the straight line of the fine
control range. Also rounded off by a parabola, the fine control straight line transitions into the
saturation range. This starts with a straight line followed by a parabola along a continuous
tangent open to the bottom, which ends at the point (Q = 100 %, U = 100 %).
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