Available Options; Characterization; Control Sets - GE Baker Hughes Masoneilan SVI FF Installation And Operation Manual

Available Options

Some of the options available for the SVI FF include:
Remote Position Sensor
A Contact Output User Linked to Various Status and Alarm Flags
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Pushbutton Display

Characterization

A characterization defines the relationship between the input signal and the output position of
the valve. The SVI FF has a five built-in characterization curves. The additional Custom
characterization requires manually entering values and is only for experts and under special
circumstances.
The characterization may contain up to 21 configurable XY pairs and the position is linearly
interpolated between the pairs. The first position is always 0, 0 and the last position is always
100,100. You can specify how many points to define between the start point (0, 0) and the
endpoint (0, 100). The points are added as xy pairs.
The algorithm posts a failure if the curve slope violates the slope limitations: x/y or y/x < 20.
NOTE
When you change characterization type, the Transducer block and AO block must be in OOS
and the system is de-energized.

Control Sets

The position controller is a type of non-linear PID control algorithm with eight parameters
listed below, as well as Auto Tune and Custom.
The preferred method is Auto Tune, which automatically tunes the valve. Custom requires
manually entering values and is only for experts and under special circumstances. A Custom
control set with out of range PID parameters is rejected by the system.
Configure the parameters using the parameter name or using FF parameter. Also see the
"Control Sets Configuration" on page 48.
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BHGE
When the characteristic is linear, the displays of position setpoint
and target valve position all match. For all other (non-linear)
characteristics the valve target position differs from the setpoint.
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