Data Sheet

DVC6200 SIS Digital Valve Controller
D103555X012
Product Bulletin
62.1:DVC6200 SIS
September 2013
3
Valve Diagnostics
The DVC6200 SIS digital valve controller provides a
broad and deep portfolio of valve diagnostic
capabilities. Whether the 475 Field Communicator is
used to check for valve alerts and operational status, or
ValveLink software is used for comprehensive
diagnostic test and analysis, the tools are easy to use.
Valve diagnostic tests enable condition and
performance monitoring of the entire valve assembly -
not just the digital valve controller. Results are
displayed graphically, with severity indicated by a
red/yellow/green icon. A detailed description of the
identified issue as well as suggestions for
recommended actions are provided.
In the event that the DVC6200 SIS is commanded to
trip, diagnostic data can be gathered automatically to
be used for troubleshooting.
Examples of identifiable issues are:
n Valve Stuck
n Solenoid Stuck
n Low air supply or pressure droop
n Dirty air supply
n External air leak (actuator diaphragm or tubing)
n Piston actuator O‐ring failure
n Excessive valve assembly friction
n Low valve assembly friction
n Broken actuator spring
n Broken valve/actuator shaft
For additional information on FIELDVUE diagnostics
and ValveLink software refer to Bulletin 62.1:ValveLink
Software (D102227X012).
Solenoid Valve Health Monitoring
If a solenoid valve is installed between the DVC6200
SIS pressure output and the actuator, as shown in
figure 3, the final control element assembly can be
configured to verify the operation of the solenoid valve
during online operation. In single-acting actuator
applications, the “unused” output port of the
DVC6200 SIS can be piped such that the pressure
downstream of the of solenoid valve is measured.
When the solenoid valve is pulsed, the DVC6200 SIS
can sense the momentary pressure drop across the
solenoid valve. The solenoid should be pulsed long
enough to detect a pressure drop across the solenoid
valve, but not so long that it affects the travel of the
final control element. This not only increases the
availability of the solenoid valve during a safety
demand, but also enhances the reliability of the SIF
(Safety Instrumented Function) loop.
Figure 3. Solenoid Valve Testing
ValveLink Software Screen Image Showing Pressure
Drop Across the Solenoid Valve
TRAVEL
SET POINT
TRAVEL
PORT B
PRESSURE
0.100 sec
0.095 sec
E1028
AS
S
E1460