MTS SWIFT 30 Sensor - Manual (Page 129)

SWIFT 30 Sensors Troubleshooting 129
Spinning Zero Procedure:
The Bridge Zero and Angle
Zero indicators stay on too
long, or they continue to
blink slowly, even after the
wheel has rotated twice. The angular output signal is
not reaching the TI. The TI
will wait for the two
revolutions as noted by the
encoder. If the encoder
signal is not reaching the TI,
it may eventually time out
and blink slowly, indicating
a zero failure.
Check that all cables are attached and
undamaged. In particular, check the main signal
cable from the transducer to the TI.
Check that the encoder output is present. The
angle output signal from the TI should be a 0–5
V sawtooth output while the transducer is
spinning at a constant velocity.
The EncoderSize parameter
in the calibration file is set
incorrectly.
Check that the EncoderSize parameter is set
properly for the slip ring (EncoderSize=1).
The indicators will stay lit if
there is no encoder signal. If
the wheel stops rotating or
the encoder is disconnected
after data collection has
started, the data collection
will time out and blink
slowly.
If this signal is not present, check that the slip
ring/encoder assembly has not been damaged. If
you suspect encoder damage, swap the slip ring
assembly with a known functioning unit to
verify it. If the slip ring/encoder assembly is
damaged, call MTS or replace it with a spare
slip ring assembly.
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
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.
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.
Troubleshooting Guide (part 2 of 12)
S YMPTOM P OSSIBLE C AUSES S OLUTION