GE BAKER HUGHES Masoneilan SVi 1000 Quick Start Manual page 40

Table of Contents

Notes on Aggressiveness

Setting Aggressiveness

Aggressiveness Dynamic

40 | =BHGE

While the SVi1000 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 values

are determined, they are stored in NVRAM.

The SVi1000 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 Aggressive-

ness 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 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.

Table of Contents