FisherÂ® FIELDVUE DVC6200 Digital Valve Controller

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Principle of Operation July 2012 Instruction Manual D103605X012 Figure A‐2. Typical FIELDVUE Instrument to Personal Computer Connections for ValveLink Software CONTROL SYSTEM HART MODEM FIELD TERM. E1362 DVC6200 digital valve controllers are loop‐powered instruments that provide a control valve position proportional to an input signal from the control room. The following describes a double‐acting digital valve controller mounted on a piston actuator. The input signal is routed into the terminal box through a single twisted pair of wires and then to the printed wiring board assembly submodule where it is read by the microprocessor, processed by a digital algorithm, and converted into an analog I/P drive signal. As the input signal increases, the drive signal to the I/P converter increases, increasing the I/P output pressure. The I/P output pressure is routed to the pneumatic relay submodule. The relay is also connected to supply pressure and amplifies the small pneumatic signal from the I/P converter. The relay accepts the amplified pneumatic signal and provides two output pressures. With increasing input (4 to 20 mA signal), the output A pressure always increases and the output B pressure decreases. The output A pressure is used for double‐acting and single‐acting direct applications. The output B pressure is used for double‐acting and single‐acting reverse applications. As shown in figure A‐3 the increased output A pressure causes the actuator stem to move downward. Stem position is sensed by the non‐contact travel feedback sensor. The stem continues to move downward until the correct stem position is attained. At this point the printed wiring board assembly stabilizes the I/P drive signal. This positions the flapper to prevent any further increase in nozzle pressure. As the input signal decreases, the drive signal to the I/P converter submodule decreases, decreasing the I/P output pressure. The pneumatic relay decreases the output A pressure and increases the output B pressure. The stem moves upward until the correct position is attained. At this point the printed wiring board assembly stabilizes the I/P drive signal. This positions the flapper to prevent any further decrease in nozzle pressure. 80
Instruction Manual D103605X012 Principle of Operation July 2012 Figure A‐3. FIELDVUE DVC6200 Digital Valve Controller Block Diagram INPUT SIGNAL 4-20 mA + HART TERMINAL BOX DRIVE SIGNAL PRINTED WIRING BOARD VALVE TRAVEL FEEDBACK AUXILIARY TERMINALS I/P CONVERTER PNEUMATIC RELAY OUTPUT A SUPPLY PRESSURE OUTPUT B E1361 VENT VALVE AND ACTUATOR Figure A‐4. FIELDVUE DVC6200 Digital Valve Controller Assembly HOUSING PNEUMATIC RELAY GAUGES COVER TERMINAL BOX WITH COVER PRINTED WIRING BOARD ASSEMBLY MODULE BASE ASSEMBLY I/P CONVERTER W9925-2 81
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FisherÂ® FIELDVUE DVC6200 Digital Valve Controller

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