Emerson Fisher FIELDVUE DVC2000, Инструкция по эксплуатации

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Installation
July 2009 2-9
Note
When field converting a GX actuator
from fail-open to fail-closed (or
vice-versa), you will need to change
the plugs for the pneumatic passages
in the DVC2000 housing.
To convert to fail-closed, remove
the R1/8 pneumatic plug on the back
of the DVC2000 housing and install an
O-ring. Plug the external pneumatic
output with a 1/4 NPT or G1/4 plug
(depending on the housing version).
Refer to figure 2-12.
To convert to fail-open, remove the
external pneumatic plug (1/4 NPT or
G1/4 plug depending on the housing
version). Install an R1/8 plug on the
back of the DVC2000 housing. Install
tubing between the pneumatic output
connection of the DVC2000 to the
pneumatic port on top of the actuator
casing.
Guidelines for Mounting on
Quarter-Turn (Rotary) Actuators
The DVC2000 digital valve controller can be mounted
to any quarter-turn (rotary) actuator, as well as those
that comply with the NAMUR guidelines. A mounting
bracket and associated hardware are required. Refer
to figure 2-13.
1. Isolate the control valve from the process line
pressure and release pressure from both sides of the
valve body. Shut off all pressure lines to the actuator,
releasing all pressure from the actuator. Use lock-out
procedures to be sure that the above measures stay in
effect while you work on the equipment.
2. Attach the magnet assembly to the actuator shaft.
At mid-travel, the flats on the magnet assembly must
be parallel to the channel on the back of the DVC2000
housing, as shown in figure 2-14.
3. Install the mounting bracket on the actuator.
4. Attach the digital valve controller to the mounting
bracket using the 4 mounting bolts, as shown in
figure 2-13.
5. Check for clearance between the magnet assembly
and the positioner feedback slot.
Figure 2-13. For Rotary Actuators (with Typical Mounting
Bracket Shown)
W8835
M6 MOUNTING
BOLTS (4)
6. Install tubing between the actuator casing and the
pneumatic positioner output connection that has the
arrow pointing away from the opening. See figure 2-7.
Electrical and Pneumatic
Connections
The electrical and pneumatic connections on the
digital valve controller are available with the following
combinations:
1/4 NPT supply and output with 1/2 NPT conduit
connections
G1/4 supply and output with M20 conduit
connections
Supply Connections
WARNING
Severe personal injury or property
damage may occur from process
instability if the instrument air supply
is not clean, dry, and oil-free. While
use and regular maintenance of a
filter that removes particles larger that
40 micrometers in diameter will
suffice in most applications, check
with a Emerson Process Management
field office and industry instrument air
quality standards for use with
corrosive air or if you are unsure
about the proper amount or method
of air filtration or filter maintenance.
Supply pressure must be clean, dry air or
nonflammable, noncorrosive gas that meets the
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