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The Maintenance and Precautions for Electric Actuators

Source:http://www.flowxgroup.com/Update Time:2014-05-06Hits:

An electric actuator provides stimulus for secondary equipment with an electric motor. The output of electric actuators has two types-- the linear and the rotary, while rotary actuators can produce more than one complete rotation. Most linear electric actuators utilize a gear arrangement to lengthen and shorten the actuation arm. In accordance with the application torque demands revolving types also employs direct connections to transfer movements or gears, cams. Electric actuators have a long standing reputation that they are widely applied in controllers for doors and vents, valves, and machining processes. An electric actuator may be considered as a remote switch used to produce a rather broad range of movement. .In remote locations many switching or actor functions are needed, where electric actuator are also used, together with environments where it would be dangerous for an operator to work, and occasions where high-torque outputs are required. Actuators have various power sources, including compressed air, high pressure oil, and electric motors. Electric actuators have a long standing reputation for using an internal alternating current (AC) or direct current (DC) electric motor,. Thus, make its actuation a linear or rotary output.

Precautions

Before energization of the electric actuator, there must be visual and insulation inspection, whether the power circuit (arc electrical circuit) and signal contacts are insulate from the shell. The power must not be less than 20MΩ measuring by a 500V me ohmmeter: the insular material between signal input, output and power circuits, except under special circumstance, should be energized after passing below l0mΩ. After energized, check whether the transformer, electrical and electronic components and other parts of the circuit is overheating; rotate components to see where there is noise. When notice abnormal phenomenon, the power should be immediately cut off and identify the cause. Before identifying the reasons, do not easily disassemble components.

When replacing electronic components, should avoid overheating and in order not to damage components. When replace the effect tube and integrated circuits, the electric iron must be contact to the ground, or use the waste heat of the welding power source for wielding. When removing parts, components or welding wires, the mark is indispensible in case of mixture of different components. The opening of the output circuit and the power failure of the inspected equipment during signal input should be avoided. The maintenance of electric actuator must be carried out after verification. For dry motor coil, the insulation resistance between the shell and the coil should be checked, clean bearings and add high-quality lubricating oil, check the rotor, stator coil and braking equipment; For retarder, the diverse components should be disintegrated and cleaned, inspect planetary gear parts, check the bevel wheel , check whether the turbine vortex rod and screw nut are meshing. Finally assemble these parts, adjust and add long-term Keng grease. For the position sensor part visual inspection is needed, check whether the coaxial potentiometer and the stroke control mechanism are connected, the basic position of potentiometer also should be checked is the connection between potentiometer and amplified plate.

From the traditional point of view, the cylinder and electric pneumatic actuators have a long standing reputation for belonging to two completely different areas of automation products. With the level of electrification continues to improve, the electric actuator was slowly immersed in the pneumatic field. Those two are both competitive and complementary in the application.

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