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 appropriate control mode for an electric actuator is crucial in industrial automation. The selection depends heavily on the specific needs of the production process, such as whether precise flow regulation is required or just on/off control is sufficient.
Electric Actuator Control Modes
Switch Type
(Open Loop Control)
Switch-type actuators are commonly used to control valves that only need to be fully open or fully closed. These actuators do not provide fine-tuned control over fluid flow and are typically used in applications where binary control is sufficient. It's important to understand the structural differences between switch-type actuators when selecting them for a system.
1. Split Structure (Common Type): In this configuration, the control unit is separate from the actuator itself. This means that the actuator cannot operate independently and requires an external controller or control cabinet to function. While this setup can be effective, it often leads to higher installation costs, more complex wiring, and greater difficulty in troubleshooting.
2. Integrated Structure (Integral Type): Here, the control unit is built into the actuator, allowing for local operation without the need for an external controller. Remote control is also possible through signal outputs. This design simplifies installation, reduces wiring complexity, and makes maintenance easier. However, traditional integrated models may have limitations, which is why modern intelligent actuators are now widely used.
Adjustable Type (Closed Loop Control)
Adjustable actuators offer more advanced functionality compared to switch-type units. They not only allow for on/off control but also enable precise regulation of valve position, which is essential for controlling fluid flow accurately.
1. Control Signal Type: These actuators typically use either current signals (such as 4–20 mA or 0–10 mA) or voltage signals (like 0–5 V or 1–5 V). It’s vital to specify the type and parameters of the control signal during the selection process to ensure compatibility with the control system.
2. Working Mode: There are two common working modes: 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 values. Understanding the working mode is key to ensuring proper system integration and performance. 