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1、Associated Information Sheet u T 8350 ENEdition December 2013 Data Sheet T 8384-3 Fig. 1: Type 3730, direct attachment to Type3277 Pneumatic Actuator Fig. 2: Type 3730, attachment to NAMUR rib Fig. 3: Type 3730, attachment according to VDI/VDE3845 Fig. 4: Type 3730 External position sensor with Type
2、 3510 Micro-flow Valve The positioner ensures a predetermined assignment of the valve position (controlled variable x) to the input signal (reference vari- able w). It compares the input signal received from a control system to the travel or rotational angle of the control valve and issues a corresp
3、onding output signal pressure (output variable y). Special features Simple attachment to all common linear and rotary actua- tors with interface for SAMSON direct attachment (Fig.1), NAMUR rib (Fig.2), valves with rod-type yokes according to IEC60534-6-1 or to rotary actuators according to VDI/ VDE3
4、845 (Fig.3) Any desired mounting position of the positioner Simple single-knob, menu-driven operation LCD easy to read in any mounted position due to selectable reading direction Configurable with a PC over the SSP interface using the TROVIS-VIEW software Variable, automatic start-up with four diffe
5、rent initialization modes Preset parameters - only values deviating from the standard need to be adjusted Calibrated travel sensor without gears susceptible to wear Sub initialization mode (substitution) allows the positioner to be started up in case of emergency whilst the plant is running without
6、the valve moving through the whole travel range Permanent storage of all parameters in EEPROM (protected against power failure) Two-wire system with a small electrical load of 410 Adjustable output pressure limitation Activatable tight-closing function Continuous monitoring of zero point Integrated
7、temperature sensor and operating hours counter Two standard programmable position alarms Self-diagnostics; alarms as condensed state conforming to NAMUR Recommendation NE107, issued over a fault alarm contact or optional analog position transmitter Integrated EXPERTplus diagnostics (T 8389 EN) suita
8、ble for throttling and on/off valves and with additional partial stroke test for valves in safety-instrumented systems Certified according to IEC 61508/SIL Series 3730 Type 3730-3 Electropneumatic Positioner with HART communication Application Single-acting or double-acting positioner for attachment
9、 to pneumatic control valves. Self-calibrating, automatic adaptation to valve and actuator. Reference variable 4 to 20 mA Rated travels 3.6 to 200 mm Opening angle 24 to 100 Versions Type 3730-3 Electropneumatic positioner with LCD, on- site operation, local communication with SSP interface, EXPERTp
10、lus diagnostics, with HART communication Type 3731-3 Ex d positioner As above, with flameproof enclosure See Data Sheet uT8387-3EN 2 T 8384-3 Additional options Inductive limit switch with proximity switches Analog position transmitter with two-wire transmitter Forced venting function with solenoid
11、valve Binary input External position sensor (Fig.4) Analog input x Stainless steel housing Leakage sensor to monitor the seat leakage Principle of operation The positioner is mounted on pneumatic control valves and is used to assign the valve position (controlled variablex) to the control signal (re
12、ference variablew). The positioner compares the electric control signal of a control system to the travel or rotational angle of the control valve and issues a signal pressure (output variabley) for the pneumatic actuator. The positioner mainly consists of an electric travel sensor system (2), an an
13、alog i/pmodule with a downstream air capacity booster and the electronics with the microcontroller (5). When a system deviation occurs, the actuator is either vented or filled with air. If necessary, the signal pressure change can be slowed down with a Q-restriction that can be connected as necessar
14、y. The signal pressure to the actuator can be limited by software to 1.4, 2.4 or 3.7bar. A constant air stream with a fixed set point to the atmosphere is created by flow regulator (9) with a fixed set point. The i/p module (6) is supplied with a constant upstream pressure by the pressure reducer (8
15、) to make it independent of the supply air pressure. Operation The positioner is operated with a user-friendly rotary pushbut- ton. The parameters are selected by turning the knob, pushing it activates the required setting. In the menu, all parameters are listed in one level, eliminating the need to
16、 search in submenus. All parameters can be checked and changed on site. All values are displayed on the LCD. The reading direction of the LCD can be rotated by 180. The closing direction of the control valve is indicated to the positioner by setting the slide switch Air to open/Air to close. It assigns the CLOSED position of the control valve to the 0% reading. The INIT key activates initialization which is started according to the ready adjusted parameters (autotune)
