Emerson Fisher Fieldvue DVC6030f Instruction Manual page 37

procedures to be sure that the above measures stay in
effect while you work on the equipment.
2. Attach the connector arm to the valve stem
connector.
3. Attach the mounting bracket to the digital valve
controller housing.
4. If valve travel exceeds 2 inches, a feedback arm
extension is attached to the existing 2-inch feedback
arm. Remove the existing bias spring (key 78) from
the 2-inch feedback arm (key 79). Attach the feedback
arm extension to the feedback arm (key 79) as shown
in figure 2-2.
5. Mount the digital valve controller on the actuator as
described in the mounting kit instructions.
6. Set the position of the feedback arm (key 79) on
the digital valve controller to the zero drive position
(zero pressure from Port A with Relay Type A) by
inserting the alignment pin (key 46) through the hole
on the feedback arm as follows:
D For air-to-open actuators (i.e., the actuator
stem retracts into the actuator casing or cylinder as air
pressure to the casing or lower cylinder increases),
insert the alignment pin into the hole marked ''A''. For
this style actuator, the feedback arm rotates
counterclockwise, from A to B, as air pressure to the
casing or lower cylinder increases.
D For air-to-close actuators (i.e., the actuator
stem extends from the actuator casing or cylinder as
air pressure to the casing or upper cylinder increases),
insert the alignment pin into the hole marked ''B''. For
this style actuator, the feedback arm rotates
clockwise, from B to A, as air pressure to the casing or
upper cylinder increases.
Note
When performing the following steps,
ensure there is enough clearance
between the adjustment arm and the
feedback arm to prevent interference
with the bias spring.
March 2006
7. Apply lubricant to the pin of the adjustment arm. As
shown in figure 2-3, place the pin into the slot of the
feedback arm or feedback arm extension so that the
bias spring loads the pin against the side of the arm
with the valve travel markings.
8. Install the external lock washer on the adjustment
arm. Position the adjustment arm in the slot of the
connector arm and loosely install the flanged hex nut.
9. Slide the adjustment arm pin in the slot of the
connector arm until the pin is in line with the desired
valve travel marking. Tighten the flanged hex nut.
10. Remove the alignment pin (key 46) and store it in
the module base next to the I/P assembly.
11. After calibrating the instrument, attach the shield
with two machine screws.
Type DVC6025 on Long-Stroke (4 to 24
Inch Travel) Sliding-Stem Actuators and
Rotary Actuators
WARNING
Refer to the Installation WARNING at
the beginning of this section.
If ordered as part of a control valve assembly, the
factory mounts the digital valve controller on the
actuator, makes pneumatic connections to the
actuator, sets up, and calibrates the instrument. If you
purchased the digital valve controller separately, you
will need a mounting kit to mount the digital valve
controller on the actuator. See the instructions that
come with the mounting kit for detailed information on
mounting the digital valve controller to a specific
actuator model.
Note
Refer to Type DVC6005f Base Unit
Mounting on page 2-10 when installing
a Type DVC6025 remote feedback unit.
Type DVC6025 remote feedback units use a cam and
roller as the feedback mechanism. Figure 2-4 shows
an example of mounting on sliding-stem actuators with
travels from 4 inches to 24 inches. Some long-stroke
applications will require an actuator with a tapped
lower yoke boss. Figures 2-5 and 2-7 show an
example of mounting on rotary actuators.
Installation
2-13
2