Sensor Technology RWT440, Руководство пользователя

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Transducer Control 5 User Manual (RWT3746IM)
Revision 7, September 2020 - Page 20
Reset Dead Band
The Reset Dead Band is a ± band around zero, and is specified as a percentage of
FSD. The dead band is a band where the “Reset Hold Time” will not be applied. The
band relates to the Auto Reset value, and not the reset point. The purpose of the band
is to avoid applying the hold time for irrelevant misfires, caused by residual torque or
value jitter around zero.
Examples
The following waveforms illustrate the Auto Reset capability.
Example 1
A ±10Nm sign wave torque signal is applied to the transducer (yellow line). The
“Reset Percentage”, “Reset Hold time”, “Reset Trigger Time” and “Reset Dead
Band” are all zero. The Peak Torque Auto Reset value (blue line) tracks the
peak and resets when it crosses zero.
Example 2
A synthesized torque signal (yellow line) is applied to transducer, scaling from
0 to 10Nm. This example is more complex and uses all of the parameters. The
“Reset Percentage” = 80%, “Reset Hold time” = 750ms, “Reset Trigger Time”
= 40ms and “Reset Dead Band” = 20%. The initial jitter is tracked, but because
it falls within the dead band, the hold time is not used. As torque is increased,
the Peak Torque Auto Reset value (blue line) tracks. The two glitches, while
below 80%, do not satisfy the 40ms reset period. The Peak Torque Auto Reset
value is held until the third larger dip drops below 80%, and stays below 80%
for more than 40ms. At this point the hold time is triggered, and holds the Peak
Torque Auto Reset value for 750ms, at which point it resets.