Rockwell Automation 1440-VLF02-01RA XM-121 Absolute Shaft Module - Manual (Page 61)

Publication GMSI10-UM014D-EN-P - May 2010
Configuration Parameters 53
Tachometer Transducer Parameters
Tachometer Transducer Parameters
Parameter Name Description Values/Comments
Tachometer Name (XM Serial
Configuration Utility only) A descriptive name to help identify the tachometer in
the XM Serial Configuration Utility software. Maximum 18 characters
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
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