Electric part-turn actuators - AUMA - #29

Text version of the page

[7] Electromechanical control unit Used in actuators equipped with or without integral controls. Travel and torque are mechanically sensed. When reaching the tripping points, microswitches are operated For detailed information on electromechanical control unit, please refer to page 38. [7a] Limit and torque setting Switching points of end positions and tripping torques are mechanically set. After removal of housing cover and mechanical position indication, all setting elements are easily accessible. [7b] Torque sensing Torque is sensed via a lever system. When exceeding tripping torques in operation directions OPEN or CLOSE, respective microswitches are operated via cams. [7c] Limit sensing Valve position is mechanically sensed via a counter gear mechanism for directions OPEN and CLOSE. When reaching an end position, respective microswitches are operated via cams. [7d] Microswitches In the basic version, one limit switch each is available for the end positions OPEN and CLOSED and one torque switch for the directions OPEN and CLOSE. As an option, tandem switches are available to activate different potentials. [7f] Remote position transmitter (RWG) The optional RWG supports that the valve position is issued as continuous 0/4 – 20 mA signal to the DCS. Blinker transmitter for running indication (no shown) Throughout full travel, the segment washer operates and releases the blinker switch. DUO limit switching (not shown) The optional DUO limit switching allows to set an additional switching point for each operation direction to signal an intermediate position. [8] Electronic control unit The electronic control unit can only be implemented in combination with AC integral controls. Valve position and torque are mechanically transmitted and continuously recorded via the magnetic transmitter. AC controls internally process all signals and provides suitable feedback on the display and at the communication interface. Valve position and tripping torques are set via AC local controls - without opening the housing. End position and torque settings are saved in the non-volatile memory of the control unit electronics. When replacing the AC controls, these settings still be retained. [8a] Limit sensing Current valve position is mechanically sensed via four gear stages. Consequently, the position is instantaneously and correctly detected even after power supply failure. Battery backup is not required. [8b] Torque sensing Like the valve position, applied torque is mechanically sensed. However, one gear stage suffices. [8c] Hall sensors High resolution Hall sensors continuously sense gear stage position of limit and torque. A continuous limit and torque signal is supplied by the device electronics. [7e/8d] Heater The heater minimises condensation within the switch compartment. Please refer to page 41 for detailed information. | 29