Instruction Manual

DVC6000 SIS
September 2013
4-16
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%)
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.
 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 4-3. You can
reset the Cycle Counter by configuring it as zero.
 Cycle Count Alert Point—The value of the Cycle
Counter, in cycles, which, when exceeded, sets the
Cycle Counter Alert.
Cycle Count/Travel Accumulator Deadband
(1-2-3-5-2)
 Deadband
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 4-3.
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.
Travel Accumulator (1-2-3-5-3)
 Travel Accumulator Alert Enable—Yes or No.
Activates checking of the difference between the
Travel Accumulator value and the Travel Accumulator
Alert Point. The Travel Accumulation Alert is set when
the Travel Accumulator value exceeds the Travel
Accumulator Alert Point. It is cleared after you reset
the Travel Accumulation to a value less than the alert
point.
 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 Deadband.
See figure 4-4. You can reset the Travel Accumulator
by configuring it to zero.
 Travel Accumulator Alert Point—The value of the
Travel Accumulator, in percent (%) of ranged travel,
which, when exceeded, sets the Travel Accumulator
Alert.
SIS Alerts (1-2-3-6)
 PST Pressure Limit—Partial Stroke Pressure
Limit defines the output pressure that will cause the
partial stroke test to stop. For actuators that vent from
the test starting point, the pressure limit will be a
minimum value. For actuators that fill from the test
starting point, the pressure will be a maximum value.
 Pressure Deviation Alert Enable—Yes or No.
This alert notifies a monitoring system when a
deviation in the actuator pressure has occurred. This
is used when the instrument is controlling via pressure
(Pressure Control Mode is enabled) to the actuator
(rather than valve position) to prevent saturation of the
pneumatic output. When enabled, this alert checks the
difference between the target pressure and the actual
pressure. If the difference exceeds the Pressure
Deviation Alert Point for more than the pressure
deviation time, the Pressure Deviation Alert is set. It
remains set until the difference between the target
pressure and the actual pressure is less than the
Pressure Deviation Alert Point. The pressure deviation
alert point and deviation alert time are configurable
and can be disabled altogether.
 Pressure Deviation Alert Point—The alert point
for the difference between the pressure target and the
actual pressure. When the difference exceeds the
alert point for more than the Pressure Deviation Time,
the Pressure Deviation Alert is set. After completion of
the Setup Wizard or Auto Travel calibration a default
value of 2 psi is set. This will generate an alert when
the actuator pressure is not within $2 psi of the target
pressure.
 Pressure Deviation Time—The time, in
seconds, that the pressure deviation must exceed the
Pressure Deviation Alert Point before the alert is set.
The Pressure Deviation Time is set to 30 seconds by
default.
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