Transducer Block
March 2006
5-35
Deadband Reference
Deadband (+/− 5%)
Deadband exceeded, and direction
changed, new Reference Point
established
Point
Point at which
cycle is counted.
A6533-1/IL
Figure 5-6. Cycle Counter Deadband (set at 10%)
which, when exceeded, sets the Travel Accumulator
Alert.
Tvl Accum DB
Travel Accumulator Deadband (TVL_ACCUM_DB
[77.5]) is the area around the travel reference point, in
percent (%) of ranged travel, that was established at
the last increment of the accumulator. This area must
be exceeded before a change in travel can be
accumulated. See figure 5-7.
Performance
(TB > Detailed Setup > Alerts > Performance)
Note
Performance Alerts are only available
with a PD tier instrument. Additionally,
for the PD alerts to function properly:
The transducer block mode must
not be out of service.
The travel/pressure control state
must be in travel control mode, and
Bench Set Hi, Bench Set Lo, and
Nominal Supply Pressure must be set
in the Spec Sheets, then enable the
Performance Information instrument
alert (PERF_ENABLE [75.7]).
Performance Active
Performance Active (PERF_ACTIVE [74.7]) displays
which of the following Performance Alerts are active:
Performance Critical—Active if the instrument is no
longer able to control the valve or performance has
been dramatically reduced.
Performance Reduced—Active if the instrument has
detected a reduction in performance.
Performance Information—Active if the instrument has
detected a condition that may pertain to control
performance.
Performance Enable
Performance Enable (PERF_ENABLE [75.7]) permits
enabling or disabling the Performance Alerts above.
Instrument
(TB > Detailed Setup > Instrument)
Max Supp Press
Enter the maximum supply pressure
(MAX_SUPP_PRESS [42.6]) in psi, bar, or kPa,
depending on what was selected for pressure units.
Pressure Units
Define the output and supply pressure units
(PRESSURE_UNITS [90]) in either psi, bar, or kPa.
Temp Units
Enter the temperature units
(TEMPERATURE_UNITS
[89])
in degrees Fahrenheit or Celsius. The
temperature is measured from a sensor mounted on
the digital valve controller’s printed wiring board.
Tvl Units
Define the units for valve travel (TVL_UNITS [91]) in
inches, centimeters, millimeters or degrees.
Length Units
Define the units for valve dimensions
(LENGTH_UNITS [92]) in inches, centimeters, or
millimeters.
Area Units
Define the units for actuator area (AREA_UNITS [93])
in inches
2
, centimeter
2
or millimeter
2
.
Spring Rate Units
Define the units for actuator spring rate
(SPRING_RATE_UNITS [94]) in lbs/in
2
or N/M.
5
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