MTS SWIFT 10 ATV Sensor - Manual (Page 121)

SWIFT 10 ATV Sensors Troubleshooting 121
Zero Offset: One or
more Signal Outputs
appears to have a zero
offset after the TI elec-
tronics have been
zeroed. (Continued) The reference angle of the
transducer is set incorrectly
in non-spinning (fixed)
mode.
The AngleFixed value in the TI calibration file
is initially set to zero, indicating that the
coordinate outputs shown on the transducer
label are correct when the label is upright. If the
label is not upright, or if the AngleFixed value
in the calibration file is not set correctly, the
angular transformation may be causing the
error.
For example, if the transducer should be sensing
only a vertical load with the vehicle at rest, but
the angle is set incorrectly, it may give an output
of longitudinal load and vertical load based on
this erroneous axis orientation set by the
AngleFixed value. To correct, verify that the
AngleFixed value matches the actual
orientation of the transducer.
The AngleOffset value is
incorrect in the calibration
file.
If an incorrect AngleOffset value is set in the TI
calibration file, an axis which should have no
load may show some load from another vehicle
coordinate axis based on the incorrect reference
orientation. Verify that the correct AngleOffset
is set for your specific application (refer to ,
“Edit the Calibration File,” on page 57).
Excessive noise during the
zero procedure caused an
incorrect bridge zero, or the
angle computation to be
calculated incorrectly.
Electrical Noise: The transducer has power
conditioning, shielded cables and on-board
amplification to reduce electrical noise.
However, if the TI or transducer are very near a
powerful noise source, some noise can be
picked up with the signal.
Check that the TI electronics are grounded
properly through the power cable to the power
source. If possible, perform the zeroing and
shunt calibration procedure away from the noise
source.
Physical Noise: If the transducer is part of an
assembly that is connected to active hydraulics
or other assemblies that may experience
physical vibrations, these vibrations may be
picked up as inertial forces read by the
transducer. Check that the transducer is not
experiencing dynamic loading or vibrations
during the zero process or shunt calibration.
Troubleshooting Guide (part 4 of 10)
S YMPTOM P OSSIBLE C AUSES S OLUTION