Fisher® FIELDVUE DVC6200 Digital Valve Controller
Fisher® FIELDVUE DVC6200 Digital Valve Controller
Fisher® FIELDVUE DVC6200 Digital Valve Controller
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Glossary<br />
July 2012<br />
Instruction Manual<br />
D103605X012<br />
Travel Deviation<br />
The difference between the analog input signal<br />
(in percent of ranged input), the “target” travel,<br />
and the actual “ranged” travel.<br />
Travel Deviation Alert<br />
Checks the difference between the target and the<br />
ranged travel. If the difference exceeds the Travel<br />
Deviation Alert Point for more than the Travel<br />
Deviation Time, the Travel Deviation Alert is<br />
active. It remains active until the difference is less<br />
than the Travel Deviation Alert Point.<br />
Travel Deviation Alert Point<br />
An adjustable value for the target travel and the<br />
ranged travel difference, expressed in percent,<br />
When this value is exceeded by the travel<br />
deviation for more than the Travel Deviation<br />
Time, the Travel Deviation Alert is active. Valid<br />
entries are 0% to 100%. Typically this is set to 5%.<br />
Travel Deviation Time<br />
The time, in seconds. that the travel deviation<br />
must exceed the Travel Deviation Alert Point<br />
before the alert is active. Valid entries are 1 to 60<br />
seconds.<br />
Travel Limit<br />
A setup parameter that defines the maximum<br />
allowable travel (in percent of ranged travel) for<br />
the valve. During operation, the travel target will<br />
not exceed this limit. There are two travel limits:<br />
high and low. Typically the travel limit low will be<br />
used to keep the valve from going completely<br />
closed.<br />
Travel Range<br />
Travel, in percent of calibrated travel, that<br />
corresponds to the input range.<br />
Travel Sensor<br />
A device within the <strong>FIELDVUE</strong> instrument that<br />
senses valve stem or shaft movement. The travel<br />
sensor in the <strong>DVC6200</strong> is the Hall Effect sensor<br />
that measures the position of the magnetic<br />
assembly.<br />
Travel Sensor Motion<br />
Increasing or decreasing air pressure causes the<br />
magnet assembly to move up or down or the<br />
rotary shaft to turn clockwise or<br />
counterclockwise. The Setup Wizard asks if it can<br />
move the valve to determine travel.<br />
Tuning<br />
The adjustment of control terms or parameter<br />
values to produce a desired control effect.<br />
Tuning Set<br />
Preset values that identify gain settings for a<br />
<strong>FIELDVUE</strong> instrument. The tuning set and supply<br />
pressure together determine an instrument's<br />
response to input signal changes.<br />
Watch Dog Timer<br />
A timer that the microprocessor must rearm<br />
periodically. If the microprocessor is unable to<br />
rearm the timer, the instrument goes through<br />
reset.<br />
Zero Power Condition<br />
The position of the valve (open or closed) when<br />
the electrical power to the instrument is<br />
removed. Zero Power Condition (ZPC) is<br />
determined by relay and actuator action as<br />
follows:<br />
Single Acting Direct (Relay C) Upon loss of<br />
electrical power instrument goes to zero air<br />
output at port A.<br />
Double Acting (Relay A) Upon loss of electrical<br />
power instrument goes to full supply air output at<br />
port B. A goes to zero air output.<br />
Single Acting Reverse (Relay B) Upon loss of<br />
electrical power instrument goes to full supply air<br />
output at Port B.<br />
96
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