Stroking The Digital Valve Controller Output; Parts - Emerson Fisher FIELDVUE DVC2000 Instruction Manual

DVC2000 Digital Valve Controller
The DVC2000 digital valve controller has the capability
to provide predictive maintenance information through
the use of ValveLink software. This software allows
you to pinpoint instrument and valve problems without
disrupting the process. For information on using
ValveLink software, see the ValveLink software User
Guide.
Avoid personal injury or property
damage from sudden release of
process pressure or bursting of parts.
Before performing any maintenance
procedures on the the DVC2000
digital valve controller:
6
D Always wear protective clothing,
gloves, and eyewear when performing
any maintenance procedures to avoid
personal injury or property damage.
D Do not remove the actuator from
the valve while the valve is still
pressurized.
D Disconnect any operating lines
providing air pressure, electric power,
or a control signal to the actuator. Be
sure the actuator cannot suddenly
open or close the control valve.
D Use bypass valves or completely
shut off the process to isolate the
control valve from process pressure.
Relieve process pressure from both
sides of the control valve.
D Vent the pneumatic actuator
loading pressure and relieve any
actuator spring precompression.
D Use lock-out procedures to be
sure that the above measures stay in
effect while you work on the
equipment.
D Check with your process or
safety engineer for any additional
measures that must be taken to
protect against process media.
6-2
WARNING
CAUTION
When replacing components, use only
components specified by the factory.
Always use proper component
replacement techniques, as presented
in this manual. Improper techniques or
component selection may invalidate
the approvals and the product
specifications, as indicated in table
1-1. Improper replacement techniques
or component selection may also
impair operations and the intended
function of the device.
Stroking the Digital Valve
Controller Output
Note
Stroke Valve is not available with
instrument level AC.
From the Online menu, select Setup & Diag and
Stroke Valve. Follow the prompts on the Field
Communicator display to select from the following:
Done, Ramp Open, Ramp Closed, Ramp to Target,
Step to Target, and Stop.
D Done—Select this if you are done. All ramping is
stopped when DONE is selected.
D Ramp Open—ramps the travel toward open at
the rate of 1.0% per second of the ranged travel.
D Ramp Closed—ramps the travel toward closed at
the rate of 1.0% per second of the ranged travel.
D Ramp to Target—ramps the travel to the
specified target at the rate of 1.0% per second of the
ranged travel.
D Step to Target—steps the travel to the specified
target.
D Stop—stops the command.
July 2009