![forward and reverse motor spool forward and reverse motor spool](https://slideplayer.com/slide/6232148/20/images/20/An+Example+of+a+Selector+Switch+Used+for+Motor+Reversing.jpg)
![forward and reverse motor spool forward and reverse motor spool](https://i.ytimg.com/vi/9DZ1WlJ5Ox4/maxresdefault.jpg)
No matter how complex a valve might become, it is important to keep in mind a few basic ideas. Whether you need a single-spool valve to operate a log splitter or a stack valve with 8, 10 or even more work sections, you will be able to find, or configure, a valve with the options that allow it to work in the application needed. They can range from being simple, low-cost and compact to ultra-sophisticated, multi-section instruments with price tags to match. Images courtesy of Prince Hydraulics Corp.ĭirectional valves have been used for many years.
#FORWARD AND REVERSE MOTOR SPOOL MANUAL#
Manual control of stack valves via handles is ideal if space is not an issue but cost is. These features, in turn, help lower operating costs. All of these features can provide more control, more efficient use of the valve and energy savings. Today we see things such as fine metering spools, load sense, proportional features and remote controls to shift spools. If the stop button SB1 is pressed firstly, the contactor’s coil is powered off to reset, main contact of the contactor disconnects, cut off the input power supply of VFD directly, then the motor stops working.Hydraulic directional control valves have always been fundamental to hydraulic circuits, machinery and equipment, but an increase in technology is bringing a new level of performance, sophistication and efficiency to these crucial workhorses. Press the stop button SB1, the contactor’s KM coil is powered off to reset, main contact of the contactor disconnects, the three-phase power supply is cut off. When stopping is required, place the selector switch SA in the middle position, and VFD stops working firstly. When the SA is connected with REV, the motor rotates in a reverse direction. Operate the selector switch SA, when SA is connected with FWD, the motor rotates in a forward direction. When the contactor’s main contact in main circuit is closed, input end R, S, T of VFD is powered, and the VFD is prepared to work. When pressing the start button SB2, the contactor KM coil is powered on to pull in and lock, the contactor’s movable contact KM between COM and SA connects. RP refers to the frequency-given signal potentiometer.Ĭonnect the power supply switch QF firstly and ensure the circuit is powered on. The control circuit consists of VFD built-in auxiliary circuit, start button switch SB2, stop button switch SB1, electromagnetic coil of AC contactor KM, contactor frequently-opening auxiliary contacts and motor forward and reverse selector switch SA. Main circuit of load working consists of power supply switch (breaker), main contact of AC contactor KM, VFD built-in AC-DC-AC converter circuit, and three-phase asynchronous AC motor M. It can be seen from the figure that the circuit consists of two parts: main circuit of load working and control circuit. The figure above refers to the circuit diagram for VFD to control the forward and reverse of three-phase asynchronous AC motor.
![forward and reverse motor spool forward and reverse motor spool](https://29.cdn.ekm.net/ekmps/shops/cbb39e/images/wiper-seal-control-valve-spool-kit-part-no.-25-975703-25-975704--[2]-1029-p.jpg)
We will explain with an example, such as the figure below:
![forward and reverse motor spool forward and reverse motor spool](https://www.smalloutboards.com/images/J4071xjan11/side1.jpg)
In fact, a good effect could also be obtained for controlling the forward and reverse of three-phase asynchronous AC motor with a three phase VFD. When we talk about variable frequency drive, we know that it has a good effect on speed regulation. Working process of VFD control three-phase asynchronous AC motor forward and reverse.