10.03
4.5 Manipulated voltage output
4-125
Siemens AG, 2003. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
Valves with a fine control range are described in Section 4.7. An inverse charac-
teristic is applied to compensate the nonlinear characteristic of these valves.
The breakpoint on real valves is rounded. For this reason, the breakpoint range
in the compensation characteristic 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. Fig. 4-15 shows a sample
characteristic and illustrates how the associated machine data works.
The knee point is defined by the percentage for input (voltage) and output
(flow).
100%
100%
-100%
-100%
U
Q
MD 5464
MD 5481
MD 5466
MD 5482
MD 5485
MD 5480
MD 5486
MD 5465
MD 5483
MD 5467
MD 5487
MD 5484MD 5488
MD 5468
(positive/negative)
(positive/negative)
Fig. 4-15 Valve characteristic with breakpoint in zero, fine control and saturation ranges
S Valve characteristic with breakpoint in zero range
5480
POS_DUAL_GAIN_COMP_Z_FLOW [n] 0...7 index of the parameter set
Cross reference: -
Knee-point compensation pos. flowrate in zero range Related to:
HLA
Protection level:
3/3
Unit:
%
Default:
0.01
Minimum:
0.01
Maximum:
95.0
Data type:
FLOAT
Active:
Immediately
5481
POS_DUAL_GAIN_COMP_Z_VOLT [n] 0...7 index of the parameter set
Cross reference: -
Knee-point compensation pos. voltage in zero range Related to:
HLA
Protection level:
3/3
Unit:
%
Default:
0.0
Minimum:
0.0
Maximum:
95.0
Data type:
FLOAT
Active:
Immediately
Linearization of
valve
4 Firmware Drive Functions
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