MTS WIFT Mini Transducer Interface - Manual (Page 67)

Zero the Transducer Interface
SWIFT ® Mini TI Installation 67
Alternate zero procedures
Firmware changes were made to the Mini TI to make it compatible with older
models. These firmware changes provide two additional zeroing procedures. For
the spinning zero method, use the TI2Xfer to download the spinning calibration
file (serialnumbers.cal) to the appropriate TI box. The angle mode in the
calibration file should be:
AngleMode=0
Now one physically has to specify the zero algorithm. The above two procedures
are the most common and still recommended but the following combinations also
make sense and could be used:
AngleMode=0 (spinning) defaulted to ZeroAlgorithm=1 (angle with level,
bridges with 1 rotation)
AngleMode=0 (spinning) defaulted to ZeroAlgorithm=3 (angle and bridges
with 1 rotation)
Zero the TI – one
revolution averaging
without inclinometer
(unloaded)
ZeroAlgorithm=3.
Recommended for spinning applications… (Angle Mode = 0)
(The TI will collect one revolution of raw bridge data, average the data, and
remove the DC offset by setting the zero offsets to the average value. The angle
offset will be calculated using a sine curve fit to the raw bridge data)
When you zero the TI, you want the vehicle to be fairly level and the transducer
to be as close to plumb as practical.
1. Raise the vehicle with a lift or with jacks until each wheel is off the road
surface.
The vehicle should be raised in a level manner, such that the orientation of
the anti-rotate bar is the same in the lifted position as it was in the grounded
position
Note Perform the remainder of this procedure completely for one transducer/
TI box combination at a time.
2. Rotate the tire one full revolution so that the encoder can find the zero index
mark.
Note The encoder has a red dot on the mounting flange connected to the slip
ring bracket and a black dot on the slip-ring connector housing where it
interfaces with the mounting flange. These dots, when aligned next to
each other, indicate the index mark is under the encoder sensor.
3. Push the Zero button on the front of the TI box. When the lower Zero
indicator turns on, proceed to the next step.