Auto Tvl Calib; Crossover Point - Emerson Fisher Fieldvue DVC6030f Instruction Manual

DVC6000f Series
Changes to the tuning set may cause
the valve/actuator assembly to stroke.
To avoid personal injury and property
damage caused by the release of
pressure or process fluid, provide
some temporary means of control for
the process.
When the Setup Wizard is complete you are asked if
you wish to run Auto Travel Calibration now. Select
yes to automatically calibrate instrument travel at this
4
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 Calibrate
Travel in this section.
Note
Relay adjustment for single acting
relays is not normally required.
However, it is recommended that you
check the relay adjustment for double
acting relays in new installations
before proceeding with travel
calibration. Refer to page 6-5 for relay
adjustment instructions.
If after completing auto setup and auto calibration the
valve seems slightly unstable or unresponsive, you
can improve operation by selecting Stabilize/Optimize
from the Basic Setup menu. For additional information
on stabilizing or optimizing valve response, refer to
Stabilize/Optimize, also in this section.

Auto Tvl Calib

(TB > Basic Setup > Auto Tvl Calib
During calibration the valve will move
full stroke. To avoid personal injury
and property damage caused by the
release of pressure or process fluid,
provide some temporary means of
control for the process.
4-6
WARNING
)
WARNING
ACTUATOR
STEM
90_
A6536−3 / IL
Figure 4-3. Crossover Point
There are two Auto Travel Calibration options
available; autocalibrate-standard or
autocalibrate−extended. Autocalibrate-extended is
used for very large, slow moving actuators or
actuators with accessories, and may also be needed
for remote mount calibration.
Auto Travel Calibration requires user interaction only
when the Feedback Connection is SStem - Standard.
If the Feedback Connection is Rotary - All, SStem -
Roller, no user interaction is required. For valves with
the SStem - Standard Feedback Connection,
interaction provides a more accurate crossover
adjustment.
1. Select the method of crossover adjustment:
manual, last value, or default. Manual adjustment is
recommended.
If you select Last Value, the crossover setting
currently stored in the instrument is used and there
are no further user interactions with the
auto-calibration routine (go to step 3). If you select
Default, an approximate value for the crossover is sent
to the instrument and there are no further user
interactions with the auto-calibration routine (go to
step 3). If you select Manual, the Field Communicator
prompts you to adjust the transducer block set point
until the feedback arm is 90° to the actuator stem, as
shown in figure 4-3. After you have made the
adjustment, press OK and go to step 3.
2. The Field Communicator displays a menu to allow
you to adjust the crossover.
FEEDBACK ARM
March 2006