Instruction Manual
D103785X012
Glossary
June 2017
112
Travel Deviation
The difference between the analog input signal
(in percent of ranged input), the “target” travel,
and the actual “ranged” travel.
Travel Deviation Alert
Checks the difference between the target and the
ranged travel. If the difference exceeds the Travel
Deviation Alert Point for more than the Travel
Deviation Time, the Travel Deviation Alert is
active. It remains active until the difference is less
than the Travel Deviation Alert Point.
Travel Deviation Alert Point
An adjustable value for the target travel and the
ranged travel difference, expressed in percent,
When this value is exceeded by the travel
deviation for more than the Travel Deviation
Time, the Travel Deviation Alert is active. Valid
entries are 0% to 100%. Typically this is set to 5%.
Travel Deviation Time
The time, in seconds. that the travel deviation
must exceed the Travel Deviation Alert Point
before the alert is active. Valid entries are 1 to 60
seconds.
Travel Limit
A setup parameter that defines the maximum
allowable travel (in percent of ranged travel) for
the valve. During operation, the travel target will
not exceed this limit. There are two travel limits:
high and low. Typically the travel limit low will be
used to keep the valve from going completely
closed.
Travel Range
Travel, in percent of calibrated travel, that
corresponds to the input range.
Travel Sensor
A device within the FIELDVUE instrument that
senses valve stem or shaft movement. The travel
sensor in the DVC6000 HW2 is mechanically
connected to the valve stem or shaft.
Travel Sensor Motion
Increasing or decreasing air pressure causes the
shaft to rotate clockwise or counterclockwise.
Device Setup asks if it can move the valve to
determine travel.
Tuning
The adjustment of control terms or parameter
values to produce a desired control effect.
Tuning Set
Preset values that identify gain settings for a
FIELDVUE instrument. The tuning set and supply
pressure together determine an instrument's
response to input signal changes.
Watch Dog Timer
A timer that the microprocessor must rearm
periodically. If the microprocessor is unable to
rearm the timer, the instrument goes through
reset.
Zero Power Condition
The position of the valve (open or closed) when
the electrical power to the instrument is
removed. Zero Power Condition (ZPC) is
determined by relay and actuator action as
follows:
Single Acting Direct (Relay C)
Upon loss of
electrical power instrument goes to zero air
output at port A.
Double Acting (Relay A)
Upon loss of electrical
power instrument goes to full supply air output at
port B. A goes to zero air output.
Single Acting Reverse (Relay B)
Upon loss of
electrical power instrument goes to full supply air
output at Port B.
