MTS SWIFT 30 Sensor - Manual (Page 62)

SWIFT 30 Sensors 62
Select a Zero Method
Setting up the Transducer Interface
Zero Algorithms
The following table lists the different values available and the angle zero
and bridge zero functions that they perform:
Zero Algorithm Values Defined (part 1 of 2)
Z ERO A LGORITHM W HEN TO U SE B RIDGE Z ERO A NGLE Z ERO
0 Use this algorithm for
non-spinning (road
simulator) applications.
(AngleMode=1)
When you press the Bridge
Zero button, the TI measures
the static transducer bridge
offsets. It sets up zero DACs
to provide 0.0 V raw bridge
output.
The Bridge Zero LED will
light for 3–4 seconds, and
will go off when the zero
process is complete.
The Angle Zero button is non-
functional.
1 Use this algorithm for
spinning (test track)
applications.
You will need to
mechanically level the
SWIFT sensor.
The transducer is
unloaded during the
zero process.
(AngleMode=0)
When you press the Bridge
Zero button, the TI will
collect one revolution of raw
bridge data, average the data,
and remove the DC offset by
setting the zero DACs to the
average value.
The Bridge Zero LED will
light continuously until the
wheel is turned for one
revolution (index-to-index).
After one revolution of data
is collect, it will flash (at
approximately 4 Hz) for 30
seconds while the bridge
zero values are computed.
When you press the Angle Zero
button, the TI will read the current
angle and use the value to set the
angle sum to 0.0 degrees.
The Angle Zero LED will light
for a few seconds while the TI sets
the angle offset value.
If you do not press the Angle Zero
button, the value for AngleOffset
will not be updated in the
calibration file.
The wheel must be rotated past the
encoder index pulse at least once
after power up so that the
electronics can determine the
absolute angular position.
2 Reserved for future use. N/A N/A