Working principle of linear electric actuator
The linear electric actuator is a fully electronic electric actuator that uses AC220V single-phase power as the driving power source and accepts DC4-20mA or DC1-5V control signals from the regulating system to operate. The electronic control unit adopts the form of an integrated control box and is sealed with barrel grease. The drive motor adopts an AC reversible motor. The drive quantity feedback adopts a high-performance electric plastic potentiometer. When the electric actuator is used as the actuator of the adjustment valve, it is almost equipped In addition to the various action conversion functions required by the regulating valve itself, as well as the opening signal function (DC4-20mA) and manual function, the actuator can be combined with various straight-stroke regulating mechanisms to form a high-performance and high-reliability electric regulating valve.
Composition of linear electric actuator
There is a servo system in the linear electric actuator, and no additional servo amplifier is required. Only connect the control signal line and AC single-phase power line, you can control the operation, the connection is very simple; It adopts hybrid integrated circuit, resin casting and sealing, small size, high reliability; With self-diagnosis function, in case of failure , Display light indication on the control component; high control accuracy, basic error: ±1%; hysteresis: 1%; dead zone: 0.8-1.0% (adjustable to 0.4%); during the control process, when the power is off, Ensure that its position is self-locking; it is easy to use the selector switch to select its position to self-lock, open or close when the signal is broken; use the selector switch to realize the conversion of positive and negative effects; adopt synchronous belt transmission to achieve low noise. It is easy to select the input signal as DC4～20mA or DC1-5V; it is simple and easy to adjust the zero point and stroke with a potentiometer.
Linear electric actuator control method
The linear electric actuator has three control modes: continuous adjustment, manual remote control, and local manual operation.
The automatic adjustment system using the linear electric actuator, equipped with the DFD-1000 electric operator, can realize the disturbance-free switching of the adjustment system from manual to automatic (automatic to manual).
Features of linear electric actuator
The position transmitter has a constant current output characteristic, and the output current is d.c. 4～20mA
Can withstand more frequent starts and stops
The electric actuator system has better stability
Environmental conditions for the use of linear electric actuators
(1) Ambient temperature: actuator ≤-10-+55℃
(2) Relative humidity: actuator ≤95%