DVC6200f Digital Valve Controller
November 2010
28
When Device Setup is complete you are asked if you
wish to run Auto Calibration now. Select yes to
automatically calibrate instrument travel at this time.
Follow the prompts on the Field Communicator
display. The calibration procedure uses the valve and
actuator stops as the 0% and 100% calibration points.
For additional information, refer to Auto Calibration in
the Calibration section.
Note
Single-acting relay B and C are not
user-adjustable. However, it is
recommended that you check the relay
adjustment for double-acting relay A in
new installations before proceeding
with travel calibration.
Refer to page 201 for relay adjustment
instructions.
If after completing setup and calibration the valve
cycles or overshoots (unstable), or is unresponsive
(sluggish), you can improve operation by running
Performance Tuner or Stabilize/Optimize.
Performance Tuner
Field Communicator
TB > Configure/Setup > Basic Setup >
Performance Tuner
WARNING
During performance tuning the valve
may move, causing process fluid or
pressure to be released. To avoid
personal injury and property damage
caused by the release of process fluid
or pressure, isolate the valve from the
process and equalize pressure on
both sides of the valve or bleed off
the process fluid.
The Performance Tuner is used to determine digital
valve controller tuning. It will move the valve slightly
and monitor the effects of small tuning changes until
an optimum control response is achieved. Because
the Performance Tuner can detect internal instabilities
before they become apparent in the travel response, it
can generally optimize tuning more effectively than
manual tuning. Typically, the Performance Tuner
takes 3 to 5 minutes to tune an instrument, although
tuning instruments mounted on larger actuators may
take longer.
3
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Страница 251: ...Principle of Operation November 2010 239 A A Appendix A Principle of Operation Digital Valve Controller Operation 240 A ...
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