DVC6000 Digital Valve Controllers
September 2013
4-14
ALERT IS CLEARED
ALERT IS SET
TRAVEL ALERT
HIGH POINT
TRAVEL ALERT
DEADBAND
A6532/IL
Figure 4-2. Travel Alert Deadband
Travel Alert Hi Hi Enable—Yes or No. Activates
checking of the ranged travel against the Travel Alert
Hi Hi points. Factory default is No.
Travel Alert Lo Lo Enable—Yes or No. Activates
checking of the ranged travel against the Travel Alert
Lo Lo points. Factory default is No.
Travel Alert Hi Hi Point—The value of the travel,
in percent (%) of ranged travel, which, when
exceeded, sets the Travel Alert Hi Hi alert.
Travel Alert Lo Lo Point—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.
Travel Alert Hi Enable—Yes or No. Activates
checking of the ranged travel against the Travel Alert
High Point. Factory default is No.
Travel Alert Lo Enable—Yes or No. Activates
checking of the ranged travel against the Travel Alert
Lo Point. Factory default is No.
Travel Alert Hi Point—The value of the travel, in
percent (%) of ranged travel, which, when exceeded,
sets the Travel Alert High alert.
Travel Alert Lo Point—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 Enable—Yes or No.
Activates the Travel Limit / Cutoff Hi alert.
Travel Limit/Cutoff Lo Alert Enable—Yes or No.
Activates the Travel Limit/Cutoff Lo alert.
Cutoff Hi
Travel Cutoff Hi defines the 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%
Cutoff Lo
Travel Cutoff Lo defines 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 set point.
Below this cutoff,the pressure target is set to
−
23%. A
Pressure Cutoff Lo of 0.5% is recommended to help
ensure maximum shutoff seat loading. Pressure Cutoff
Lo is deactivated by setting it to
−
25.0%
Change Cutoffs—Allows you to set Cutoff Hi and
Cutoff Lo. When a cutoff is set the corresponding
travel or pressure limit is disabled.
Travel Limit Hi—Defines the high limit for the
travel in percent (%) of ranged travel. It is the
maximum allowable travel (in percent of ranged travel)
for the valve. During operation, the travel target will
not exceed this limit. When a Travel Limit High is set,
the Travel Cutoff High is deactivated, since only one of
these parameters can be active. Travel Limit High is
deactivated by setting it to 125.0%.
Travel Limit Lo—Defines the low limit for the
travel in percent (%) of ranged travel. It is the
minimum allowable travel (in percent of ranged travel)
for the valve. During operation, the travel target will
not exceed this limit. When a Travel Limit Low is set,
4
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