SVI-II Instruc Man.book - Fagerberg

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Advanced Usage Using ValVue 2.4 Diagnostics Diagnostic Valve Tests The standard diagnostic test performs a full stroke test, and determines stroking speed. The Step Response test moves the valve between several points selected by the user and graphically presents the dynamic response for each step. The Positioner Signature test strokes the valve over a travel specified by the user and records a signature for comparison with the as-built and with future tests to predict maintenance intervals. The full version of ValVue 2.4 is required for diagnostic tests. E-3
Glossary Accuracy Actuator Type Algorithm ATC Air to Close ATO Air to Open CALIBrate Characteristic In a control valve the position is measured between mechanical motion limits in the valve. These limits can include position variations due to actuator and valve rigidity. therefore, accuracy is referenced to positions within normal travel of the valve independent of rigidity effects at the mechanical limits. Accuracy is the greatest deviation from the expected position within the normal travel, expressed as percent of normal travel. An actuator is a device that transforms an input signal (mainly an electrical signal) into motion. A HART compliant actuator receives a 4 - 20 mA control current signal and causes an actuation function. There are many types of HART actuators; a positioner is type of actuator. A device of type Actuator may not be connected to a circuit intended for a device of type Transmitter. An algorithm is a procedure or formula for solving a problem. There are several algorithms entailed in SVI II AP operation. The SVI II AP has a position control algorithm that is a modified PID. Other algorithms embedded in SVI II AP include the STOPS method for calibrating stroke, and the autoTUNE method for establishing the best parameters for the PID algorithm. The combination of a single acting actuator and the control valve where the valve is closed when air pressure is applied to the actuator The combination of a single acting actuator and the control valve where the valve is open when air pressure is applied to the actuator A mode of the positioner in which the user has access to changing the calibration of stroke, input signal, and tuning parameters. The positioner input setpoint command can be selectively modified to provide a desired relationship between setpoint and valve position. In the valve, the relationship between stroke and Cv is also called valve inherent characteristic. It is often adjusted by design, to equal percentage, for example. The positioner characteristic is applied to modify the setpoint to travel relationship of the actuator. The characteristic of the positioner must be chosen to compliment the valve. If the valve is equal percentage, the positioner should be set to linear. If a linear valve is installed the positioner can be set to an equal percentage characteristic to improve flow control. SVI II AP offers an eleven point custom characteristic option that can be created and edited in G-1
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Warranty Items sold by Dresser, ®
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Masoneilan Dresser SVI II AP-1 Inst
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Mounting the SVI II AP on Rotary Va
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Pushbuttons and Local Display for C
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Pneumatic Cover Installation . . .
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Figure 42 Double Acting Pneumatic R
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Introduction 1 The SVI ® II AP (Sm
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Introduction Operational Overview A
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Installation and Set Up 2 Overview
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Installation and Set Up Pre-Install
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Installation and Set Up Installatio
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Installation and Set Up Mounting th
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Installation and Set Up Installing
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Installation and Set Up Connecting
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Installation and Set Up Connecting
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Installation and Set Up Wiring the
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Check Out and Power Up 3 Overview T
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Check Out and Power Up Physical Ins
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Check Out and Power Up Physical Ins
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Check Out and Power Up Operational
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Check Out and Power Up Operational
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Using the Digital Interfaces Pushbu
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Using the Digital Interfaces Displa
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Using the Digital Interfaces Hand H
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Configuration and Calibration 5 Con
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Configuration and Calibration Confi
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Configuration and Calibration Confi
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Configuration and Calibration Calib
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Page 82 and 83: Wiring an SVI II AP Wiring Guidelin
Page 88 and 89: Wiring an SVI II AP HART Physical L
Page 90 and 91: Wiring an SVI II AP Split Range App
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Page 104 and 105: Operation and Maintenance Physical
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Page 114 and 115: Operation and Maintenance Upgrading
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Page 124 and 125: Air Supply Requirements C A high qu
Page 126 and 127: Advanced Usage E Technology to Maxi
Page 130 and 131: Glossary Closed Compliance Voltage
Page 132 and 133: Glossary HART Communication The HAR
Page 134 and 135: Glossary Padj (%) Valves often have
Page 136: DIRECT SALES OFFICE LOCATIONS BELGI
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SVI-II Instruc Man.book - Fagerberg

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