Emerson Fisher FIELDVUE DVC2000, Инструкция по эксплуатации

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Detailed Setup and Calibration
July 2009 4-11
Deadband Reference
Deadband (+/
−
5%)
Deadband exceeded,
new Reference Point
established
Point
This amount of change is
added to the Travel
Accumulator.
A6534/IL
Figure 4-4. Travel Accumulator Deadband (set at 10%)
percent (%) of ranged travel, which, when exceeded,
sets the Travel Accumulator Alert.
Tvl Accum DB—Travel Accumulator Deadband 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 4-4.
Tvl Accum—Travel Accumulator records the total
change in travel, in percent (%) of ranged travel, since
the accumulator was last cleared. The value of the
Travel Accumulator increments when the magnitude of
the change exceeds the Travel Accumulator Dead-
band. See figure 4-4. You can reset the Travel
Accumulator by configuring it to zero.
Cycle Counter Alert
Select Setup & Diag, Detailed Setup, Alerts, and Cycle
Count Alert. Follow the prompts on the Field
Communicator display to configure the following: Cycl
Cnt Alrt Enab (Cycle Counter Alert Enable), Cycl
Count Alrt Pt (Cycle Counter Alert Point), Cycl Count
DB (Cycle Counter Deadband), Cycl Count (Cycle
Counter).
Cycl Cnt Alrt Enab—Yes or No. Cycle Counter
Alert Enable activates checking of the difference
between the Cycle Counter and the Cycle Counter
Alert point. The Cycle Counter Alert is set when the
value exceeds the Cycle Counter Alert point. It is
cleared after you reset the Cycle Counter to a value
less than the alert point.
Cycl Count Alrt Pt—Cycle Counter Alert Point is
the value of the Cycle Counter, in cycles, which, when
exceeded, sets the Cycle Counter Alert.
Deadband Reference
Deadband (+/
−
5%)
Deadband exceeded, and direction
changed, new Reference Point
established
Point
Point at which
cycle is counted.
A6533-1/IL
Figure 4-5. Cycle Counter Deadband (set at 10%)
Cycle Count DB—Cycle Counter Deadband is
the area around the travel reference point, in percent
(%) of ranged travel, that was established at the last
increment of the Cycle Counter. This area must be
exceeded before a change in travel direction can be
counted as a cycle. See figure 4-5.
Cycle Count—Cycle Counter records the number
of times the travel changes direction. The change in
direction must occur after the deadband has been
exceeded before it can be counted as a cycle. See
figure 4-5. You can reset the Cycle Counter by
configuring it as zero.
Other Alerts
Select Setup & Diag, Detailed Setup, Alerts, and Other
Alerts. Follow the prompts on the Field Communicator
display to configure Drive Alrt Enab (Drive Alert
Enable).
Drive Alrt Enab—Yes or No. Drive Alert Enable
activates checking of the relationship between the
Drive Signal and the calibrated travel. If one of the
following conditions exists for more than 20 seconds,
the Drive Alert is set.
For the case where Zero Control Signal is defined as
closed:
Drive Signal < 10% and Calibrated Travel > 3%
Drive Signal > 90% and Calibrated Travel < 97%
For the case where Zero Control Signal is defined as
open:
Drive Signal < 10% and Calibrated Travel < 97%
Drive Signal > 90% and Calibrated Travel > 3%
Alert Record
The alert record can store up to 20 alerts from any of
the enabled alert groups: Valve Alerts, Failure Alerts,
4