MTS SWIFT 20 Ultra Sensor - Manual (Page 129)

SWIFT 20 Sensors Troubleshooting 129
Some or all transducer
output signals read 0 volts
at the TI output even when
a load is present. The TI is not turned on. Check that TI is turned on and the green power
indicator is lit.
The transducer signal cable
is not connected. Check that the cable is connected between the
back of the TI box and the slip ring or the
connector housing (for a road simulator).
Output cables are not
connected. Check that the output connectors are securely
fastened to the data acquisition device.
Cables or connectors are
damaged. Check all cables and connectors, particularly the
power and signal cable. Cables must be free of
nicks or cuts, and all connector pins shown on
the cable drawings must be present and not bent.
The shunt calibration connectors intentionally
have some pins missing.
Some or all transducer
output signals read 0 volts
at the TI output even when
a load is present
(continued). Data acquisition
configuration, cabling, or
input ports are incorrect or
damaged. Verify that the data acquisition is configured
correctly. While the TI is turned on and all
cables from the SWIFT transducer to TI are
connected, use a handheld DVM to verify
output on individual channels while they are
being loaded. (Use the BNC connectors located
on the back panel of the TI.)
Grounding problem. Check that there is a good signal-to-ground
connection between the TI black lug, the signal
ground, and the ground of the external data
acquisition equipment.
Zero Offset: One or more
Signal Outputs appears to
have a zero offset after the
TI electronics have been
zeroed. The transducer was zeroed
with load applied (or a
different load than the
intended tare weight for
non-spinning applications
only). Rezero the TI, being careful not to touch or load
the transducer during the zeroing procedure.
Rotate the wheel by contacting only the inner
diameter of the SWIFT sensor, the hub adapter,
or the opposite wheel while gears are engaged.
The EncoderSize parameter
in the calibration file is set
incorrectly. Check that the EncoderSize parameter is set
properly for the slip ring (EncoderSize=1) being
used.
TI was not warmed up
before zeroing. Verify that the TI was powered on for at least
five minutes before zeroing.
Considerable temperature
changes have occurred. The SWIFT transducer is temperature-
compensated to reduce temperature-induced
errors, but any significant changes in
temperature will induce zero shifts. For best
results, zeroing should occur at the conditions
closest to those of the test conditions.
Troubleshooting Guide (part 3 of 14)
Symptom Possible Causes Solution