MTS SWIFT 30 Sensor - Manual (Page 136)

SWIFT 30 Sensors 136 Troubleshooting
The output signal polarity
is incorrect The OutputPolarities
setting is incorrect
The TI electronics can be set to change the
polarities of the outputs. The polarity of the
loads as noted on the cover labeling will be with
the TI electronics calibration file
OutputPolarities = 40.
You can change these output polarity as noted
in , “Edit the Calibration File,” on page 66
Reference Angle is 180° off. If the reference angle is 180° off, the output
polarity of some channels may appear to be
reversed. The reference angle can be verified as
described later in this table.
Reference Angle is
incorrect Spinning Zero was incorrect Zero Procedure Error: For spinning applications
with auto-zero for both bridge zero and angle
zero (ZeroAngle=3, AngleMode=0): Verify
that the zeroing procedure was done correctly as
noted in this manual, with no load or contact on
the tire other than the weight of the tire, and that
all contact was on the inner diameter only.
Spinning Zero was done
with anti-rotate device not
attached, or attached with
orientation different than
test set-up.
Make sure that the anti-rotate and slip ring
assembly are securely fastened during the
spinning zero procedure. If the anti-rotate or slip
ring is removed or rotated from the transducer,
rezeroing the transducer angle is required.
Spinning Application:
Vehicle Coordinate System
Outputs have unusual or
incorrect waveform shapes
to them. (Angular output
may need to also be
recorded to troubleshoot
based on per-revolution
outputs) A one-time-per-revolution
of tire signal appears while
the vehicle is driving
straight on a flat surface.
The mean level on FX and
FZ is equal to zero, and the
amplitude is fairly
consistent during straight
driving on a flat surface.
The amplitudes on FX and
FZ are about the same and
equal to the vehicle tare
weight.
Angle Mode: Check that the AngleMode value
is set to zero in the TI calibration file as
accessed by the TIXFER utility. AngleMode=0
sets the TI to use the encoder to give angular
transformation to the spinning signal, to provide
non-spinning vehicle coordinate system output.
Angle Input: Verify that the encoder output is
present. The Angle output from the TI box
should be a 0 to 5 V sawtooth output. If this
signal is not present, check that the encoder and
slip ring assembly has not been damaged. To
verify if encoder damage is suspected, swap the
slip ring assembly with a known functioning
unit to verify. If the slip ring/encoder assembly
is damaged call MTS or replace it with spare
slip ring assembly if available.
Troubleshooting Guide (part 9 of 12)
S YMPTOM P OSSIBLE C AUSES S OLUTION