Rockwell Automation 1440-VAD02-01RA XM-123 Aeroderivative Module User Manual
Page 66
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Publication GMSI10-UM003D-EN-P - May 2010
58
Fault Low
The minimum, or most negative, expected DC
voltage from the transducer.
Volts
Note: A voltage reading outside this
range constitutes a transducer fault.
Fault High
The maximum expected DC voltage from the
transducer.
DC Bias Time Constant
The time constant used for exponential averaging
(low pass filtering) of the transducer DC bias
measurement. The corner frequency for the low pass
filter is 1 / (2 x
π
x DC Bias Time Constant). See
example table below.
Seconds
Tachometer Transducer Parameters
Parameter Name
Description
Values/Comments
Time Constant
(seconds)
-3dB Frequency
(Hz)
Settling
(seconds)
1
0.159
2.2
2
0.080
4.4
3
0.053
6.6
4
0.040
8.8
5
0.032
11
6
0.027
13.2
7
0.023
15.4
8
0.020
17.6
9
0.018
19.8
10
0.016
22
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