DVC6200f Digital Valve Controller
November 2010
200
Calibration Overview
When a DVC6200f digital valve controller is ordered
as part of a control valve assembly, the factory
mounts the digital valve controller on the actuator and
connects the necessary tubing, then sets up and
calibrates the controller.
For digital valve controllers that are ordered
separately, recalibration of the pressure sensors
generally is unnecessary. However, after mounting on
an actuator, perform the initial setup then calibrate
travel by selecting Configure / Setup
>
Calibration
>
Auto Calibration. For more detailed calibration
information, refer to the following calibration
procedures.
Calibration
Field Communicator
TB > Configure/Setup > Calibration
Auto Calibration —This procedure automatically
calibrates the travel. The calibration procedure uses
the valve and actuator stops as the 0% and 100%
calibration points.
Manual Calibration —This procedure permits
manual calibration of the travel. This calibration
procedure allows you to determine the 0% and 100%
calibration points.
Relay —This procedure permits adjustment of
the pneumatic relay.
Supply Pressure —This procedure permits
calibrating the supply pressure sensor. Normally the
sensor is calibrated at the factory and should not need
calibration.
Pressure A— This procedure permits calibrating
the pressure A sensor. Normally the sensor is
calibrated at the factory and should not need
calibration.
Pressure B —This procedure permits calibrating
the pressure B sensor. Normally the sensor is
calibrated at the factory and should not need
calibration.
To display the calibrate menu, from the Online menu,
select Configure / Setup and Calibration.
Note
The Instrument Mode must be Out Of
Service and the Protection set to None
before the instrument can be calibrated.
If you are operating in burst mode, we
recommend that you disable burst before
continuing with calibration. Once
calibration is complete, burst mode may
then be turned back on.
WARNING
During calibration the valve will move
full stroke. To avoid personal injury
and property damage caused by the
release of pressure or process fluid,
isolate the valve from the process and
equalize pressure on both sides of the
valve or bleed off the process fluid.
If a double-acting relay is used, you will be prompted
to run the relay adjustment when auto or manual
calibration is selected. Select Yes to adjust the relay,
select No to proceed with calibration. For additional
information, refer to Relay Adjustment in this section.
Note
Relay Adjustment is only available for
the double-acting relay (Relay A).
Auto Calibration
Field Communicator
TB > Configure/Setup > Calibration > Auto
Calibration
Follow the prompts on the Field Communicator display
to automatically calibrate travel.
1. The auto calibration procedure is automatic. It is
completed when the Calibration menu appears.
During calibration, the instrument seeks the high and
low end points and the minor loop feedback (MLFB)
and output bias. By searching for the end points, the
instrument establishes the limits of physical travel, i.e.
5
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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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