Emerson Fisher FIELDVUE DVC6000, Инструкция по эксплуатации

Страница: 90 / 162

DVC6000 Digital Valve Controllers
September 2013 5-8
TRAVEL SENSOR
SHAFT
Figure 5-3. FIELDVUE DVC6020 Travel Sensor Arm/Housing
Back Plane Alignment
ARM ASSEMBLY
BACK OF HOUSING
ARM ASSEMBLY PIN
BACK EDGE
OF ARM PARALLEL
W/BACK OF HOUSING
A7025 / IL
Note
The alignment pin (key 46) is
stored inside the digital valve
controller housing.
3. Loosen the screw that secures the feedback arm to
the travel sensor shaft. Position the feedback arm so
that the surface of the feedback arm is flush with the
end of the travel sensor shaft.
4. Connect a current source to the instrument LOOP
−
and LOOP + terminals. Set the current source to
any value between 4 and 20 mA. Connect the Field
Communicator to the TALK terminals.
5. Before beginning the travel sensor adjustment, set
the instrument mode to Out Of Service and the
protection to None.
6. From the Calibrate menu select Sensor Calibration,
Travel Sensor. Follow the prompts on the Field
Communicator display to adjust the travel sensor
counts to the value listed in table 5-2.
Table 5-2. Travel Sensor Counts
Digital Valve Controller Travel Sensor Counts
DVC6010 / DVC6015 700
±
200
DVC6020 / DVC6025 2100
±
200
DVC6030
(1)
/ DVC6035
(2)
Counterclockwise shaft rotation
600
±
200
DVC6030
(3)
/ DVC6035
(2)
Clockwise shaft rotation
3400
±
200
1. Refer to figure 2-9 to determine the desired starting position for the DVC6030
based on counterclockwise potentiometer shaft rotation.
2. Refer to figure 2-14 to determine the desired starting position for the DVC6035
based on potentiometer shaft; counterclockwise or clockwise.
3. Refer to figure 2-10 to determine the desired starting position for the DVC6030
based on clockwise potentiometer shaft rotation.
Note
In the next step, be sure the feedback
arm surface remains flush with the end
of the travel sensor shaft.
7. While observing the travel sensor counts, tighten
the screw that secures the feedback arm to the travel
sensor shaft. Be sure the travel sensor counts remain
within the tolerances listed in table 5-2. Paint the
screw to discourage tampering with the connection.
8. Disconnect the Field Communicator and current
source from the instrument.
9. Remove the alignment pin and store it in the
instrument housing.
10. Install the digital valve controller on the actuator.
DVC6020 and DVC6025 Digital Valve
Controllers
WARNING
Failure to remove air pressure may
cause personal injury or property
damage from bursting parts.
1. Remove supply air and remove the instrument from
the actuator.
2. See figure 5-4 for parts identification. Disconnect
the bias spring (key 82) from the feedback arm
assembly (key 84) and the arm assembly (key 91).
Remove the mounting bracket (key 74) from the back
of the digital controller. Hold the arm assembly
(key 91) so that the arm assembly points toward the
terminal box and the arm is parallel to the back of the
housing, as shown in figure 5-3.
3. Loosen the screw that secures the arm assembly
to the travel sensor shaft. Position the arm assembly
5