Baker Hughes Masoneilan SVI II ESD Quick Start Manual page 63

Notes on Aggressiveness
Setting Aggressiveness
Aggressiveness Dynamic
ValVue ESD Software
ValVue ESD provides advanced diagnostic, maintenance capabilities and complete calibration
and configuration for the SVI II ESD. The software also performs Partial Stroke Testing (PST),
scheduled and on demand, performs valve diagnostics (proof testing) and provides results in
graphic, informational and historical formats. The software has a database to store test results
for comparison with future results for predictive maintenance. It is password protected against
access to remote instruments. It is set up with administration features.
System Requirements
®
Windows Server 2003 SP2, Windows
connected to a HART
© 2018 Baker Hughes, a GE company, LLC. All rights reserved.
While the SVI II ESD software and the DD allow you to set Aggres-
siveness, the pushbuttons do not. In all three methods, however,
the Aggressiveness value is inherited from any previously per-
formed tuning (Autotune or manual). Once Aggressiveness, and
other tuning values are determined, they are stored in NVRAM.
The SVI II ESD provides a user define Aggressiveness Level for
auto-tuning, the allowable range varies from -9 to +9 where 0
(Zero) is consider normal tuning. The Aggressiveness Level influ-
ences stroking speed and over-shoot. A negative value will SLOW
stroking speed and help minimized over-shoot. A positive value
will INCREASE stroking speed and may add some over-shoot.
The recommended values for Aggressiveness is 0 for control
valves without volume boosters.
In applications with volume boosters and/or quick exhaust
valves are used the Aggressiveness Level is not as influential. For
Auto-tuning it is usually between 0 and 3. Reduce the volume
boosters sensitivity by opening the integral bypass needle valve
about 1 to 2 turns. Use caution when adjusting the needle valve
so as to not to damage the seat, close gently to seat and then
open 1 or 2 turns.
Lower values of aggressiveness lead to lower PID values and
slower response and less overshoot.
Higher values lead to higher PID values and quicker response
and more overshoot.
Once you have a preferred aggressiveness and you tune once, all
future autotunes automatically use that same value, until
user-changed.
®
®
modem.
Server 2008, XP SP2, or 7, 64 MB RAM, a serial or USB port
Masoneilan SVI II ESD Quick Start Guide =| 63