Instruction Manual

DVC6000 SIS
September 2013
2-8
A7209-1
SPRING RELAXED
SPRING UNDER TENSION OF
ADJUSTMENT ARM PIN
FEEDBACK ARM
ADJUSTMENT
ARM PIN
BIAS
SPRING
BIAS SPRING
Figure 2-3. Locating Adjustment Arm Pin in Feedback Arm
DVC6020 SIS on Long-Stroke (4 to 24
Inch Travel) Sliding-Stem Actuators and
Rotary Actuators
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
All cams supplied with FIELDVUE
mounting kits are characterized to
provide a linear response.
Note
Do not use the stainless steel
DVC6020S SIS in high vibration service
where the mounting bracket uses
standoffs (spacers) to mount to the
actuator.
DVC6020 SIS digital valve controllers use a cam
(designed for linear response) 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 2-6 show the DVC6020 SIS mounted
on rotary actuators.
As shown in figure 2-5, two feedback arms are
available for the digital valve controller. Most
long-stroke sliding-stem and rotary actuator
installations use the long feedback arm [62 mm
(2.45 inches) from roller to pivot point]. Installations
on Fisher 1051 size 33 and 1052 size 20 and 33
actuators use the short feedback arm [54 mm (2.13
inches) from roller to pivot point]. Make sure the
correct feedback arm is installed on the digital valve
controller before beginning the mounting procedure.
Refer to figures 2-4, 2-5, and 2-6 for parts locations.
Also, where a key number is referenced, refer to figure
8-2. Refer to the following guidelines when mounting
on sliding-stem actuators with 4 to 24 inches of travel
or on rotary actuators:
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
pneumatic actuator, releasing all pressure from the
actuator. Use lock-out procedures to be sure that the
above measures stay in effect while working on the
equipment.
2. If a cam is not already installed on the actuator,
install the cam as described in the instructions
included with the mounting kit. For sliding-stem
actuators, the cam is installed on the stem connector.
3. If a mounting plate is required, fasten the mounting
plate to the actuator.
2