Siemens Sinumerik 840D Series - Page 128

10.03
4.5 Manipulated voltage output
4-128
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SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
5487
NEG_DUAL_GAIN_COMP_S_FLOW [n] 0...7 index of the parameter set
Cross reference: -
Knee-point compensation neg. flow saturation Related to:
HLA
Protection level:
3/3
Unit:
%
Default:
100.0
Minimum:
0.2
Maximum:
100.0
Data type:
FLOAT
Active:
Immediately
5488
NEG_DUAL_GAIN_COMP_S_VOLT [n] 0...7 index of the parameter set
Cross reference: -
Knee-point compensation neg. voltage saturation Related to:
HLA
Protection level:
3/3
Unit:
%
Default:
100.0
Minimum:
0.2
Maximum:
100.0
Data type:
FLOAT
Active:
Immediately
To calculate the inverse characteristic, the beginning of a saturation range with
parabolic rounding in the positive quadrant of the valve characteristic is defined
in MD 5485 and MD 5486 and in the negative quadrant with MD 5487 and
MD 5488.
The positive and negative valve flow rates at the start of the saturation range in
relation to the nominal valve flow rate (MD 5107) are entered in MD 5485 and
MD 5487 respectively.
The positive and negative valve voltages in relation to the nominal voltage
(MD 5109) are entered in MD 5486 and MD 5488 respectively.
The saturation range is compensated by a root characteristic such that the inter-
section point lies on a continuous tangent and the characteristic ends at the
point (100%, 100%).
If the default of 100% is set in MD 5485 and MD 5486 or MD 5487 and
MD 5488, there is no saturation range in the positive or negative quadrant.
100
100
Q [%]
U [%]
90
70
MD 5485 = 90%
MD 5486 = 70%
Fig. 4-16 Example
For a more detailed explanation, see also Subsection 2.3.1 and Appendix A.
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