Siemens Sinumerik 840D Series Function Manual page 125

10.03
Linearization of
valve
MD 5485
MD 5464
MD 5468
MD 5480
-100%
MD 5488 MD 5484
Fig. 4-15 Valve characteristic with breakpoint in zero, fine control and saturation ranges
5480
POS_DUAL_GAIN_COMP_Z_FLOW [n]
Knee-point compensation pos. flowrate in zero range
Unit: Default:
% 0.01
5481
POS_DUAL_GAIN_COMP_Z_VOL T [n]
Knee-point compensation pos. voltage in zero range
Unit: Default:
% 0.0
 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).
Q
100%
MD 5481 MD 5486
MD 5483
MD 5465
MD 5467
MD 5487
-100%
S
Valve characteristic with breakpoint in zero range
0...7 index of the parameter set
Minimum: Maximum:
0.01 95.0
0...7 index of the parameter set
Minimum: Maximum:
0.0 95.0
4 Firmware Drive Functions
4.5 Manipulated voltage output
U
MD 5466
100%
(positive/negative)
MD 5482
(positive/negative)
Related to:
HLA
Data type:
FLOAT
Related to:
HLA
Data type:
FLOAT
Cross reference: -
Protection level:
3/3
Active:
Immediately
Cross reference: -
Protection level:
3/3
Active:
Immediately
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