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Problems related to limit switches of electric actuators

Question: Isn't there two junction boxes on the electric actuator? (1) There are two switches in the junction box (on and off respectively). (2) Inside the junction box are the 0 and full-scale points. Device, but there are upper and lower limit point devices, what is going on? (1) Isn't there a limit switch in the junction box? What use is this upper and lower limit potentiometer? If I want to adjust, I can adjust the limit switch. I feel that the potentiometer of the upper and lower limits is useless? Besides, what is the balance potentiometer adjusting? Answer: First: The role of the limit switch is when the actuator telescopic tube reaches the top and bottom (distance of the upper and lower limit switches = stroke). The antenna of the nut on the inner tube touches the limit switch to turn off the power. , So it can only run in reverse. In simple terms, it is the maximum distance that the inner tube can be retracted. Second: The switch in the junction box is used for lifting. After the switch is turned on, the inner tube can be raised or lowered. It can be stopped at any point within the stroke range. The rear telescopic tube will slide down automatically). Third: The point device generally has five followers, two connected to the power supply, and three for signal control. The feedback signal is a resistance signal, such as a 10KΩ potentiometer. Its use range is 0 ~ 10KΩ. If the stroke of the actuator is compared Short, this is only a part of the range, maybe 0 ~ 5KΩ is enough. The potentiometer can be configured with an encoder to effectively adjust any stroke within the stroke range of the actuator, which can realize intelligence.

What parameters should I pay attention to when selecting electric actuators?

1. Select the actuator according to the type of valve: multi-turn, part-turn direct connection type, straight stroke, part-turn angle stroke; 2. Control mode: switch type, adjustable type; 3. Maximum torque value; 4.IP protection level 5.Working voltage 6. Configuration: Basic type (requires additional control box) or integral type (with local control, integrated control box) or intelligent integration (with LCD display, remote control, etc.) Determine electrical parameters based on selected electric actuator Because the electrical parameters of different actuator manufacturers are different, generally the electrical parameters need to be determined when designing and selecting, mainly including motor power, rated current, secondary control loop voltage, etc., often negligent in this regard, resulting in control systems Mismatches with electric actuator parameters cause faults such as air-open tripping, fuse blowing, and thermal overload relay protection tripping during operation.

What is the relationship between electric actuators and electric regulating shutters?

What is the relationship between electric actuators and electric regulating shutters? Is it the same or who includes who? Electric actuators are one type of actuators, but also pneumatic actuators, hydraulic actuators, and actuators, while shutter valves are a type of valve, and butterfly valves and the like. Electric actuators also include adjustable, switch-type, and mediation-type, which can control the opening degree through 4 ~ 20MA signal, and switch-type is to directly control the switch. The electric regulating louver valve is used to adjust the louver valve through an electric actuator, which can control the opening degree. What is the difference between the electric device of the flue damper and the electric actuator? Air door ~~ A wind door like a blind? The kind of door torque is small, there are specialized damper actuators, there are many automatic controls in buildings, Siemens and others do it, and the price is cheap. You can Baidu damper actuators, electric actuators are similar to butterfly valve ball valves on the pipeline anyway. The electric device equipped with the valve provides a self-control function. Of course, this can only be said briefly, and the specific one or two sentences are unclear. How to choose electric actuator according to valve? Selection of electric actuator products Electric actuator, also known as electric actuator, electric head. In pipeline engineering, when the selected valve is determined, the optional electric actuator is one of the guarantee conditions to ensure the safe and normal operation of the electric valve. If the electric actuator is not selected properly, it will not only affect the use, but also bring serious adverse consequences and economic losses. Generally, the following aspects can be considered to choose electric actuators: working environment The electric actuator is suitable for the following typical working environments. a. Outdoor outdoor installation, wind, sand, rain, snow, frost, sunlight, large temperature difference between day and night, dust and other environments. Of course, indoor installation is more applicable. b. Humid and dry tropical environment. Ambient temperature: -30 ℃ ～ 60 ℃. c. Salt spray, mold, and humid working environment, such as docks, ocean or river vessels. d. Working environment containing corrosive gases, such as chemical plants. e. Places with severe vibration, such as steam pipes and ships.

What are the split structures of electric actuators?

The split structure of the electric actuator (commonly known as the ordinary type) is that the control unit is separated from the electric actuator. The electric actuator cannot control the electric valve alone. The control unit must be added to achieve the control. Generally, a controller or a control cabinet is used outside Form supporting. The disadvantages of this structure are that it is not convenient for the overall installation of the system, increases wiring and installation costs, and is prone to failures. When a failure occurs, it is not easy to diagnose and maintain, and the cost performance is not ideal. Structure, composition, function and scope of application of indoor high voltage vacuum circuit breaker? Vacuum circuit breaker general users in the medium voltage field (3 ~ 63kV). In the past, vacuum circuit breakers were split (such as ZN28A-12, which was widely used). The circuit breaker body includes: rack, vacuum bubble, insulation rod, insulator, conductive clip, soft connection, main shaft, etc. The mechanism for operating the vacuum circuit breaker needs to be equipped separately, including electromagnetic type and spring energy storage type. The mechanism and the body are connected by a connecting rod. Such circuit breakers are now rarely used. The current main vacuum circuit breakers are integrated. In addition to the above body part, there is also a mechanism part (as an integrated mechanism, generally a spring energy storage type and a permanent magnet type), and also includes a circuit board and an overcurrent coil installed in the mechanism. The indoor high voltage vacuum circuit breaker is a component used to switch on and off the power supply; it can switch on and off the short-circuit current, but because the electrical life is shorter than that of a vacuum contactor, it is generally used in occasions where it is not frequently operated.