Determine the control mode of the electric actuator according to the production process control requirements
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Determine the control mode of the electric actuator based on the requirements of the production process
Author: - Source: - Post Time: 2013-3-7 10:23:33
Choosing the right control mode for an electric actuator is essential to ensure efficient and accurate operation in industrial applications. The selection should be made according to the specific needs of the production process, as different control modes offer varying levels of precision, flexibility, and ease of integration.
Types of Electric Actuator Control Modes
Switch Type (Open Loop Control)
Switch-type electric actuators are typically used for on/off control, where the valve is either fully open or fully closed. These actuators do not require precise flow regulation, making them ideal for applications where only binary control is needed. However, it's important to understand that switch-type actuators can be divided into two main types: split structure and integrated structure.
1. Split Structure (Standard Type): In this design, the control unit is separate from the actuator itself. This means the actuator cannot operate independently and requires an external controller or control cabinet to function. While this setup offers flexibility in some cases, it also increases installation complexity, wiring costs, and potential points of failure. Troubleshooting can be more challenging due to the distributed nature of the system.
2. Integrated Structure (Integral Type): This type integrates the control unit directly with the actuator, allowing local operation without the need for an external controller. Remote control is also possible through appropriate signal output. The main advantage of this configuration is its compact design, which simplifies installation and reduces maintenance effort. However, traditional integrated models may have limitations, leading to the development of more advanced intelligent electric actuators.
Adjustable Type (Closed Loop Control)
Adjustable electric actuators provide more advanced functionality compared to switch-type models. They not only support on/off control but also allow for precise regulation of valve position, enabling accurate control of fluid flow. This makes them suitable for complex industrial processes requiring fine-tuned adjustments.
1. Control Signal Type: The control signal used by adjustable actuators can be either current (such as 4–20 mA or 0–10 mA) or voltage (like 0–5 V or 1–5 V). It’s crucial to specify the type and parameters of the control signal during selection to ensure compatibility with the control system.
2. Operating Mode: There are two common operating modes for adjustable actuators: electric opening and electric closing. For example, in a 4–20 mA control system, an electric opening type means that 4 mA corresponds to the valve being closed, while 20 mA corresponds to it being fully open. Conversely, an electric closing type would reverse these settings. Understanding the correct operating mode is essential to avoid misoperation and ensure proper system performance. 