Masoneilan SVI II AP Installation and Maintenance ... - GE Energy
Masoneilan SVI II AP Installation and Maintenance ... - GE Energy
Masoneilan SVI II AP Installation and Maintenance ... - GE Energy
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Operation <strong>and</strong> <strong>Maintenance</strong><br />
9<br />
Principle of Operation<br />
The <strong>SVI</strong> <strong>II</strong> <strong>AP</strong> Electro Pneumatic Digital Valve Positioner receives an electrical position<br />
setpoint signal from a controller or other device <strong>and</strong> compares the position setpoint input<br />
signal to the valve position. The difference between the position setpoint <strong>and</strong> position<br />
feedback is interpreted by the position control algorithm. This is used to compute a new<br />
output pressure. This output pressure is amplified by a pneumatic relay that drives the<br />
actuator. When the valve position agrees with the value called for by the position setpoint<br />
input signal the system stabilizes with no further movement of the actuator.<br />
Input Current<br />
4 to 20 mA<br />
Figure 71<br />
Block Diagram with I/P Converter <strong>and</strong> Pressure Sensor<br />
129
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