Fisher FIELDVUE DVC6200 Instruction Manual page 52

DVC6200 Digital Valve Controller
ALERT IS SET
ALERT IS CLEARED
A6532/IL
4
Figure 4-2. Travel Alert Deadband
D Tvl Alrt Lo Lo Enab—Yes or No. Travel Alert
LoLo Enable activates checking of the ranged
travel against the Travel Alert Low-Low points.
Factory default is No.
D Tvl Alrt Hi Hi Pt—Travel Alert High-High Point
is the value of the travel, in percent (%) of ranged
travel, which, when exceeded, sets the Travel Alert
Hi Hi alert.
D Tvl Alrt Lo Lo Pt—Travel Alert Low-Low Point
is the value of the travel, in percent (%) of ranged
travel, which, when exceeded, sets the Travel Alert
Lo Lo alert.
Travel Limit Hi/Lo Alerts (1-2-3-4-6)
Travel Alert Hi is set if the ranged travel rises
above the alert high point. Once the alert is set, the
ranged travel must fall below the alert high point by
the Travel Alert Deadband before the alert is
cleared. See figure 4-2.
Travel Alert Lo is set if the ranged travel falls below
the alert low point. Once the alert is set, the ranged
travel must rise above the alert low point by the
Travel Alert Deadband before the alert is cleared.
D Tvl Alrt Hi Enab—Yes or No. Travel Alert Hi
Enable activates checking of the ranged travel
against the Travel Alert High Point. Factory default
is No.
D Tvl Alrt Lo Enab—Yes or No. Travel Alert Lo
Enable activates checking of the ranged travel
against the Travel Alert Lo Point. Factory default is
No.
D Tvl Alrt Hi Point—Travel Alert High Point is
the value of the travel, in percent (%) of ranged
travel, which, when exceeded, sets the Travel Alert
High alert.
44
Deadband exceeded,
new Reference Point
established
TRAVEL ALERT
HIGH POINT
TRAVEL ALERT
DEADBAND
Deadband Reference
Point
A6534/IL
Figure 4-3. Travel Accumulator Deadband (set at 10%)
the value of the travel, in percent (%) of ranged
travel, which, when exceeded, sets the Travel Alert
Low alert.
Travel Limit/Cutoff Alerts (1-2-3-4-7)
Travel Limit /Cutoff Hi Alert Enable activates the
Travel Limit / Cutoff Hi alert.
Travel Limit /Cutoff Lo Alert Enable activates the
Travel Limit/Cutoff Lo alert.
high cutoff point for the travel in percent(%) of
pre-characterized set point. Above this cutoff, the
travel target is set to 123.0% of the ranged travel.
Travel Cutoff Hi is deactivated by setting it to
125.0%.
Pressure Cutoff Hi defines the high cutoff point for
the pressure in percent (%) of pre-characterized
set point. Above this cutoff,the pressure target is
set to 123.0%. A Pressure Cutoff Hi of 99.5% is
recommended to ensure valve goes fully open.
Pressure Cutoff Hi is deactivated by setting it to
125%
the low cutoff point for the travel in percent (%)of
pre-characterized set point. Below this cutoff, the
travel target is set to −23%. A Travel Cutoff Lo of
0.5% is recommended to help ensure maximum
shutoff seat loading. Travel Cutoff Lo is deactivated
by setting it to−25.0%
Pressure Cutoff Lo defines the low cutoff point for
the pressure in percent (%) of pre-characterized
Deadband (+/− 5%)
D Tvl Alrt Lo Point—Travel Alert Low Point is
D Tvl Limit/Cutoff Hi Alrt Enab—Yes or No.
D Tvl Limit/Cutoff Lo Alrt Enab—Yes or No.
D Tvl/Press Cut Hi—Travel Cutoff Hi defines the
D Tvl/Press Cut Lo—Travel Cutoff Lo defines
This amount of change is
added to the Travel
Accumulator.
September 2010