Emerson FIELDVUE DVC6200f, Instruction Manual

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Maintenance and Troubleshooting
November 2010 223
2. Remove three screws (key 33).
3. Lift the PWB assembly (key 50) straight out of the
module base (key 2).
4. Ensure that the O-rings (key 40) remain in the
pressure sensor bosses on the module base assembly
(key 2) after the PWB assembly (key 50) has been
removed.
Replacing the Printed Wiring Board
Assembly
1. Apply silicone lubricant to the pressure sensor
O-rings (key 40) and install them on the pressure
sensor bosses in the module base assembly.
2. Properly orient the PWB assembly (key 50) as you
install it into the module base. The two electrical leads
from the I/P converter (key 41) must guide into their
receptacles in the PWB assembly and the pressure
sensor bosses on the module base must fit into their
receptacles in the PWB assembly.
3. Push the PWB assembly (key 50) into its cavity in
the module base.
4. Install and tighten three screws (key 33) to a torque
of 1 N
m (10.1 lbf in).
5. Reassemble the module base to the housing by
performing the Replacing the Module Base procedure.
6. Setup and calibrate the digital valve controller.
Note
Calibration is required for either Travel
or Pressure Control after PWB
Assembly replacement.
Note that only one calibration is
needed, depending on control
selection.
Pneumatic Relay
Refer to figure 8-2 for key number locations. The
pneumatic relay (key 24) is located on the front of the
module base.
W8074
RELAY SEAL
Figure 7-5. Pneumatic Relay Assembly
Note
After relay submodule replacement,
calibrate the digital valve controller
to maintain accuracy specifications.
Removing the Pneumatic Relay
1. Loosen the four screws that attach the relay
(key 24) to the module base. These screws are
captive in the relay.
2. Remove the relay.
Replacing the Pneumatic Relay
1. Visually inspect the holes in the module base to
ensure they are clean and free of obstructions. If
cleaning is necessary, do not enlarge the holes.
2. Apply silicone lubricant to the relay seal and
position it in the grooves on the bottom of the relay as
shown in figure 7-5. Press small seal retaining tabs
into retaining slots to hold relay seal in place.
3. Position the relay (with shroud) on the module
base. Tighten the four screws, in a crisscross pattern,
to a final torque of 2 N
m (20.7 lbf in).
4. Using the Field Communicator, verify that the value
for Relay Type parameter matches the relay type
installed.
5. After replacing the relay and verifying the relay
type, calibrate travel or perform touch-up calibration to
maintain accuracy specifications
Gauges, Pipe Plugs, or Tire Valves
Depending on the options ordered, the DVC6200f will
be equipped with either gauges (key 47), pipe plugs
(key 66), or tire valves (key 67). Single-acting direct
instruments will also have a screen (key 236, figure
8-3). These are located on the top of the module base
next to the relay.
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