MTS SWIFT 10 ATV Sensor - Manual (Page 124)

SWIFT 10 ATV Sensors 124 Troubleshooting
The shunt reference values
were changed.
Use the TI2XFER program to upload the
current calibration file. Check the file to verify
that the variables ShuntDeltaRef are the same
as shown on the original calibration file
provided by MTS. The eight ShuntDeltaMeas
values should read approximately 0.85 V.
The shunt tolerance is not
set correctly.
Use the TI2XFER program to upload the
current calibration file. The ShuntTolerance
value should be set at 2, indicating an allowable
shunt variation of 2%. If this value is changed to
zero or a very small number, the difference
between the reference and the current shunt
measurement may fall outside of this tolerance
and be read as a shunt failure.
Transducer cable problems. If the ShuntDeltaMeas values are not the same
as (or within tolerance of the ShuntDeltaRef
values), note which shunt values are not the
same.
If all eight are not correct, check the shunt
cables, signal cable, and power supply.
If four of the signals are not correct, verify that
both shunt cables are plugged in and are not
damaged. (Each shunt cable shunts four
bridges). If connections appear correct, swap
the transducer cable and check whether the bad
shunt values follow the cable. This indicates a
damaged or faulty cable. Check that the cable is
not damaged, and that connector pins are not
missing or damaged.
Use the same swapping technique if one or
more signals is not correct. In this case swap the
slip ring bracket and note which bridge has the
different value. If the faulty shunt value stays
the same with the slip ring bracket, look at the
connectors for damage or objects plugging the
connector and contact MTS.
Shunt Calibration as
Recorded by External Data
Acquisition is incorrect or
inconsistent. (The internal
shunt check in the TI
electronics verifies each of
the eight individual
bridges, but it is the six
bridge 10 V output that you
can record if desired.) The gains have been
changed in the calibration
file.
As the bridges are shunted, the eight raw bridge
outputs pass through the TI box and have the
calibration gains applied to them. If the
calibration file has been changed or modified,
the six bridge 10 V outputs will reflect this. Use
the TI2XFER utility to verify that the
calibration settings portion of the calibration file
matches the original, and download the original
to TI if needed.
Troubleshooting Guide (part 7 of 10)
S YMPTOM P OSSIBLE C AUSES S OLUTION