Electric actuators are an important fulfillment unit in the appearance of electric unit combinations in industrial control systems. Bernard electric actuators are generally composed of two completely independent circuits of the control circuit and the performance organization. They can receive the control signals from the DCS system and linearly convert them into mechanical or linear displacements to operate the damper. The baffles, valves, etc. are conditioned to complete the manipulation. The utility model has the advantages of convenient energy access, fast signal transmission speed, long transmission interval, convenient centralized control, high sensitivity and precision, convenient cooperation with electric conditioning appearance, and simple installation and wiring. The disadvantage is that the structure is disordered, the uniform failure rate is higher than that of the pneumatic performance organization, and it is suitable for places where the explosion-proof requirements are not high and the gas source is lacking.
When the electric actuator is installed and debugged on site, it is necessary to strictly follow the instructions of the operation. The first device under the guidance of the manufacturer, especially the adjustment of the limit stroke of the stabilizer, should ensure that the organization is not closed under satisfactory conditions. Too strict or too large, causing stuck. In practice, it is often affected by on-site messy conditions, such as structural deformation caused by high temperature, excessive differential pressure, corrosion and wear and valve sticking, causing electric performance of the organization motor overheating or maintenance actions.
Regarding this kind of problem, firstly, the electric actuator control form is cut into the "manual operation" control situation by hand-operator, and it is directly given manually to see if the electric organization is correctly performed. If the "manual operation" is normal, then go to "automatic operation", that is, input 4 ~ 20mA signal to operate, to see if it is normal; if "manual operation" is not normal, you should check whether the organization's electrical control part is normal, conditioning organization Whether it is stuck or not, remove the damper connecting rod and see if the fulfilment can operate normally without load.