Baker Hughes Masoneilan SVI II AP Series, Быстрый старт

Страница: 65 / 124

Setting Aggressive-
ness While the SVI II AP DTM and the DD allow you to set
Aggressiveness, the pushbuttons do not. In all three
methods, however, the Aggressiveness value is inher-
ited from any previously performed tuning (Autotune or
manual). Once Aggressiveness, and other tuning val-
ues are determined, they are stored in NVRAM.
The SVI II AP 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 influences 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.
Aggressiveness
Dynamic
Lower values of aggressiveness lead to lower PID val-
ues 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.
Masoneilan SVI II AP Digital Positioner Quick Start Guide = | 65
© 2020 Baker Hughes Company. All rights reserved
.
Notes on Aggressiveness