TROVIS 3797

Product description:

The TROVIS 3797 Electropneumatic Positioner is mounted on pneumatic control valves and used to assign the valve position (controlled variable x) to the control signal (set point w). The positioner compares the electric control signal issued by a control system using PROFINET over APL to the travel or opening angle of the control valve and issues a signal pressure for the pneumatic actuator. The positioner mainly consists of a non-contact travel sensor system (2), pneumatics and the electronics with the microcontroller (4). The output of the standard version is either single or double acting; which means both the Output 138 and Output 238 can provide the output variable and route the signal pressure to the actuator. The positioner can be configured to meet requirements of an application by adding a maximum of two pneumatic modules (A, B). The pneumatic modules mainly consist of a microcontroller, which operates an i/p converter with downstream spool valve. Depending on the actuator used, an output of the positioner can be sealed to achieve a single-acting function. The valve position is transmitted either as an angle of rotation or linear travel to the pick-up lever, from there to the travel sensor (2) and forwarded to the microcontroller (4). The PID algorithm in the microcontroller compares the valve position measured by the travel sensor (2) to the control signal issued by the control system. In case of a set point deviation, the pneumatic module (A, B) causes the actuator (1) to be either vented or supplied with air. As a result, the closure member of the valve (e.g. plug) is moved to the position determined by the set point. The pneumatic module is supplied with air. The flow rate of the module's output can be restricted by software. The positioner is operated by a rotary pushbutton (8) for menu navigation on the plain-text display (7). The extended EXPERTplus diagnostics are integrated into the positioner. They provide information on the control valve and positioner and generate diagnostic and status m

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