Connecting the magnetic starter
Connection diagram for a 380 V magnetic starter via a push-button post. An electrical device that is designed to remotely control an electric motor, protect it, maintain operability - this is a magnetic starter device. Often, such starters are used to automatically connect lighting lines, etc. How to connect a smart magnetic starter with your own hands. Is it possible.
To understand how to connect a magnetic starter yourself, first of all you need to learn about the features of its operation and its characteristics upon purchase.
This article will talk about how to start the switch with your own hands, how to choose the right reversing starter with a plastic case. In principle, the control buttons are located on the cover, so all that remains is to connect the power cable.
In order to begin assembling and connecting the magnetic starter you need:
1. Turn off the power and check that there is no voltage.
2. Determine the operating voltage of the coil, which is located on the housing. There are two possible options. When the voltage is 220 volts or 380 volts. In the first case, zero and phases are supplied to the contacts. If the voltage is 380, then the phases are different. If you make a mistake, the coil will burn out, so you should be careful.
3. Power contacts use phases to turn the magnetic starter on and off. And the zeros and phases need to be connected to each other.
In order to connect the starter you need
1. Contacts, 3 pieces available. Thanks to them, food will be supplied.
2. Coil, control buttons. Thanks to them, the blocking of erroneous switching on of the magnetic starter will be supported.
3. Using a circuit with one starter. To do this you will need a three-core cable and several contacts.
If you use a connection diagram with a 380-volt coil, then you need to use a different phase of red or black. Also, a free pair will be used in contact.
To connect the magnetic starter circuit, you need one green phase, which will go to the coil contact. And from the second contact it will go to the “Start” button. From the "Start" button to the "Stop" button.
That is, when you press “Start”, 220 volts will be supplied, which will help turn on the remaining contacts. To turn off the magnetic starter, you will need to break the “zero”, and to turn it back on, press “Start”.
To connect a relay, you need to connect it in series, selecting the operating current for a specific engine.
It should be connected to the magnetic output of the electric motor, then to the thermal relay and to the electric motor.
Hello, dear visitors and guests of the Electrician's Notes website.
In the last article, I told you in detail, and even made a special video about it.
Today I will continue to introduce you to the magnetic starter, namely its connection diagram.
For a more detailed and visual study of the connection diagram of a magnetic starter of an irreversible type, we will use the following electrical equipment:
- magnetic starter type PML-1100 (irreversible)
- push-button station with 3 buttons (for example, PKE 222-3U2)
- type AOL 22-4 with power 0.4 (kW)
Here, in fact, is the magnetic non-reversible starter of the PML-1100 type. You are already familiar with him.
PML-1100 refers to starters of the first magnitude, i.e. the rated current of its power (main) contacts is 12 (A) at a network voltage of 220 (V) and 380 (V). Therefore, this starter is easily suitable in terms of technical characteristics for starting our engine, which has a rated current of 1.97 (A). This can be seen on the tag, although not very clearly, because the tag is varnished after another engine repair.
Push-button post for connecting a magnetic starter
Push-button station PKE 222-3U2 has three buttons:
- red stop button
- black forward button
- black back button
I chose this type of push-button post because... the other was not available at the time of writing. To connect a magnetic irreversible starter, it is enough to purchase a push-button station with two buttons, for example, PKE 212-2U3.
You can also purchase two single push-button posts of type PKE 222-1U2.
There is now a large selection of different buttons on sale from IEK, EKF and other brands. So choose according to your “taste and color”.
Let's take a look inside the PKE 222-3U2 push-button station I chose. To do this, unscrew the 6 mounting screws.
Each button of the PKE 222-3U2 post has two contacts:
- open (normally open) is marked (1-2)
- closed (normally closed) is marked (3-4)
For example, consider the “Stop” button.
Here is a photo of the closed (normally closed) contact of the Stop button:
And here is a photo of the open (normally open) contact of the “Stop” button:
Attention!!! When you press the button, the open (normally open) contact closes, and the closed (normally closed) contact opens.
So, we figured out the buttons. Now let's start assembling a magnetic starter circuit for starting a three-phase asynchronous motor AOL 22-4.
Example
1. The source of three-phase voltage in my example is a test bench, whose linear network voltage is ~220 (V). This means that the magnetic starter coil must have a rating of 220 (V).
Here is a diagram for connecting a magnetic starter via a push-button post to start an electric motor for my example: 
If your linear voltage of a three-phase circuit is not 220 (V), but 380 (V), then you have two choices.
In the first case, the starter coil must be selected with a rating of 380 (V) with the following connection diagram:
In the second case, the control circuit must be powered from one phase (phase-zero), and the starter coil rating must be 220 (V).
In this article I will assemble a magnetic starter circuit according to the first picture, i.e. at a three-phase network voltage of 220 (V) and a starter coil voltage of 220 (V).
I will assemble the circuit using PV-1 copper wire with a cross-section of 1 sq. mm.
2. First of all, we lay three phase wires from the three-phase power source (A, B, C) to the corresponding terminals of the starter: L1 (1), L2 (3), L3 (5).
3. Then we connect the wire on one side to terminal L2 (3) of the starter, and on the other side to the closed contact of the “Stop” button marked (4).
Just now I noticed that the PKE 222-3U2 push-button station I selected does not have terminal markings. It's okay - after all, the contacts on the buttons are not hidden and are visible quite well. In the text below, I will still indicate the markings, because... it should be in other button posts.
4. Now install a jumper between the closed contact of the “Stop” button marked (3) and the open contact of the “Forward” button marked (2).
5. From terminal (1) of the “Forward” button, we lay a wire to the terminal of the starter coil (A1).
6. In parallel with the open contacts (1-2) of the “Forward” button, you need to connect the auxiliary open contact NO (13) - NO (14) of the PML-1100 magnetic starter.
Those. From terminal (2) of the “Forward” button, we lay a wire to the auxiliary contact NO (13) of the magnetic starter.
7. From the NO auxiliary contact (14) of the PML-1100 magnetic starter we make a jumper to the coil (A1).
It turned out that the open contact of the “Forward” button (1-2) and the auxiliary open contact NO (13) - NO (14) of the magnetic starter are connected in parallel.
8. And all that remains is to connect the output of coil A2 of the magnetic starter to terminal L3 (5).
As a result, we ended up with only 3 wires coming out of the PKE 222-3U2 push-button station, i.e. a three-core cable could be used for installation.
9. Let's assemble the push-button post. This is what we got.
10. We have the magnetic starter control circuit ready. It remains to connect an asynchronous motor to terminals T1 (2), T2 (4), T3 (6) and check the circuit.
This is what we ended up with.
This scheme is the simplest. In the following articles we will look at more complex connection diagrams for magnetic starters, for example, with interlocks, additional protection devices, etc.
Wiring diagram for connecting the PML-1100 starter
Especially for you, I drew a wiring diagram for connecting the starter, which I compiled in this article. Maybe it will make it easier for you to navigate the wires.
Principle of operation
The operating principle of a magnetic starter circuit through a push-button post is very simple.
1. Turn on the three-phase voltage source on the test bench.
2. Press the “Forward” button.
The PML-1100 magnetic starter is triggered and closes its power (main) and auxiliary contacts:
- L1 (1) - T1 (2)
- L2 (3) - T2 (4)
- L3 (5) - T3 (6)
- NO (13) - NO (14)
The engine starts to rotate.
There is no need to hold down the "Forward" button, because... when the magnetic starter is turned on, the contact of the “Forward” button is shunted by its own auxiliary closing contact NO (13) - NO (14). The starter coil is energized.
3. Press the red “Stop” button.
The starter coil power supply circuit (phase) is broken, and the power (main) and auxiliary contacts of the starter are opened accordingly. The engine stops.
I filmed everything that I demonstrated and told you in this article. See how a magnetic starter works:
P.S. This concludes the article on the diagram for connecting a magnetic starter via a push-button post. If you have questions about the material in the article, feel free to ask them in the comments. Thank you for your attention!!!
Consideration of generally accepted magnetic starter installation diagrams will allow the user to independently connect a three-phase asynchronous motor independently, while avoiding common mistakes, without resorting to the services of professional electricians.
Need for a specific push-button contact
It is known that the contactor of a magnetic starter is turned on by a control pulse emanating from pressing the start button, which supplies voltage to the control coil.
Keeping the contactor in the on state occurs according to the principle of self-retaining - when an additional (auxiliary) contact bypasses (connects in parallel) the start button, thereby supplying voltage to the coil, as a result of which there is no need to hold the start button pressed.
Disabling the magnetic starter in this case is possible only if the control coil circuit is broken, which makes it obvious that it is necessary to use a button with a break contact.
Based on this, the starter control buttons, which are called push-button posts, have two pairs of contacts - normally open (open, normally closed, NO, NO) and normally closed (closed, normally closed, NC, NC) (see fig.)
This universalization of all the buttons of the push-button station was made in order to anticipate possible schemes for providing instant engine reverse. It is generally accepted to call the shutdown button the word: “Stop” and mark it in red. The power button is often called the start button, start button, or is designated by the words “Start”, “Forward”, “Back”.
Simple circuit - irreversible engine mode
This mode of operation of the motor means that the shaft rotates only in one direction, the start is carried out using the “Start” button, and the stop occurs some time later (due to inertia) after pressing “Stop”.
There are two common varieties of this connection scheme - with a control coil of 220 V and 380 V (connection between two phases). A circuit using a starter coil rated at 220V requires connecting a neutral wire, but using zero is more common for the average user, so this connection option will be considered first.
Electrical connection motor via a 220 V magnetic starter It is necessary to consider all the connections in detail in order to fully understand the principle of operation of this circuit, after which it will be easier to disassemble more complex options.
Detailed consideration of electrical installation
For convenience, you need to draw up a wiring diagram.
First, the contactor is connected (of course, there should be no voltage on the input cable). In the above diagram, the voltage required for control is removed from phase “B” (L2), but the choice of phase wire in this case does not matter (as will be convenient). 
The conductor going to the “Stop” button is connected together with the phase wire at the contactor terminal. To avoid confusion, it is generally accepted to mark normally open contacts with the numbers “1”, “2”, and normally open contacts with the numbers “3”, “4”, respectively.
Then connect the wire coming from terminal “1” of the start button to terminal A1 of the contactor control coil.
From terminal “2” of the start button, you need to connect a wire to the auxiliary contact NO13. In this case, it does not matter which terminal to connect this wire to, but it is better to stick to the diagram so as not to get confused later.
It remains to connect terminal A2 of the control coil to the zero bus.
Now, having double-checked the correct installation, you can apply voltage and check the functionality of the circuit.
After making sure that the circuit is working, you can connect the leads of the motor windings to the output terminals of the contactor.
Video on connecting a magnetic starter in the classic way:
Using a 380V coil and a thermal relay
Of course, the connection of the push-button station and the three-phase motor must be done not with single wires, but with a protected cable - the examples given above are given in order to explain the entire installation process step by step.
By following these instructions step by step, the user will be able to independently assemble a magnetic starter, even without experience in electrical engineering.
Having gained experience and understood the principle of operation, you can use a contactor rated at 380 V, in this case the output from coil A2 is not connected to the zero bus, to one of the two phases to which terminal “4” (“Stop”) is not connected.
The circuit looks similar if a three-phase network with a voltage of 220V is used.
In a magnetic starter with a thermal relay, the circuit changes slightly due to the inclusion of a break contact in the wire break from terminal A2 of the contactor. Output A2 from the control coil is connected to phase or zero through the open contact of this thermal relay P, connected in series to the power circuits of the windings. (see diagram below)
Reversing electromagnetic starter
To reverse the electric motor (rotate the shaft in the opposite direction), it is necessary to change the phase sequence, for which two contactors and a push-button station with three buttons are used.
Connecting magnetic starters for motor reverse At the same time, to block the accidental simultaneous activation of both starters, it is necessary to connect the start control circuits through the breaking contacts of adjacent contactors.
If contactors do not have these auxiliary break contacts, then a contact attachment must be used.
The principle of operation, using self-retaining, remains the same, but the circuit becomes a little more complicated due to the inclusion of new elements.
Electrical connection motor through reversible magnetic starters 220 V The key point is that the opening contact of the KM2 contactor is included in the KM1 starting circuit, and vice versa. It is necessary to consider the switching process from the very beginning, when the auxiliary contact bridges KM1 and KM2 are closed, that is, it is possible to start the engine in any direction.
Let's start the KM1 starter, at which its normally closed contact, through which the starting circuit is connected in the opposite direction, opens, thereby making it impossible to reverse until KM1 is turned off. KM1 is similarly blocked when KM2 is operating. A jumper system is installed on the contactors.
Electrical connection motor through reversible magnetic starters 380 V This principle remains the same when using coils of any denomination.
Reverse is often used to brake the engine, controlling its speed using a special controller.
Switching motor windings
It is known that an asynchronous electric motor consumes lower starting currents when the windings are connected as a star, but develops maximum power if a delta-type connection circuit is used.
Therefore, in production, winding switching is used to start especially powerful electric motors.
Connecting the motor windings according to the 1. "star" and 2. "delta" circuit An electronic device controls the speed of the electric motor - as soon as it reaches the nominal value, a signal is initiated that switches the contactors, as a result of which the motor windings switch from star to delta.
Ready starter option
Thermal relays, in addition to setting the current and adjusting the shutter speed, also have a shutdown lever, which is often used in compact magnetic starters, placing the “Stop” button on the opposite side of the housing cover.
The contactor is turned on when the pressing force is mechanically transferred from the start button to a special push-button attachment attached to the contactor. The connection diagram remains the same, only in this case the push-button post is combined with a contactor in a single magnetic starter housing.
push-button station in one housing with a magnetic starter Since the connection and installation of buttons in these products is carried out directly by the manufacturer, the user only needs to connect the power and load, and adjust the thermal relay.
To correctly connect powerful loads, a 220V electromagnetic starter is used. The special design ensures synchronous closure of contact groups and interruption of power circuits of similar quality. Unlike classic switches, it is permissible to use remote start and perform protective functions using a thermal relay.
Application area
Electromagnetic starter 380V (220V) is used to connect:
- machine electric motor;
- Heating element of the melting furnace;
- lighting (heating) systems;
- duct fan;
- conveyor belt drive.
Many examples can be given. However, this list is enough to understand the intended purpose - supplying power to a powerful load. This means working with fairly high currents at standard mains voltages, 220V or 380V, respectively.
Operating principle of a 220V electromagnetic starter
The main function of the device is the synchronous movement of power contacts to close/break an electrical circuit. This movement is provided by an induction coil. When voltage is applied to the winding, an electromagnetic field is formed, which draws in the core with a fixed contact group.
Magnetic starter design
The picture below shows the components of a typical starter. The stationary lower part, when the coil is connected to the power supply, forms an electromagnetic field that attracts the moving element. The contacts connected to the armature close the operating circuit. If the winding is de-energized, the spring will return the system to its original state.
Sectors with designations
Explanatory inscriptions on the body are divided into three groups:
- general information and scope (AS1-4);
- information about permissible currents in load circuits (conversion to kW or reverse is performed taking into account the mains voltage);
- graphic designation of contact groups (the broken line indicates synchronous switching).
Each area can be explored in detail. To familiarize yourself with the classification by purpose categories, they are guided by the standards of GOST R 50030.4.1.-2002. The designation AC1 indicates the possibility of connecting the starter to heating elements, incandescent lamps and other loads with weakly expressed reactive characteristics. If you need to ensure the start of a powerful engine, choose a model of the AC3 category.
This part is mounted on a 220V electromagnetic starter to expand the basic functions:
- activation of reverse engine mode;
- additional load management;
- turning on the light indication.
For your information. A typical attachment mechanism contains two pairs of contacts. Rigid fixation of the block in a certain place is ensured by the special shape of the protrusions of the docking platform. When choosing the appropriate model, you should take into account the compliance with the starter, as well as the normally closed/open state of the contact group.
Contact groups of starters
According to current standards, input and output terminals are marked with the Latin letters L and T, respectively. In reality, taking turns doesn't matter. You can connect paired contacts to the power source and load in any combination. This is the main difference from a relay, where a permanent connection is created with one of the power supply circuits.
A separate contact group (13H0, 14H0) is designed for the operation of an independent “pickup” circuit. In this mode, the push-button start is activated by pressing once without holding.
Stop button
The control circuit of any starter is organized using two buttons without fixing the on position. “Stop” is indicated in red to enhance safety. In an emergency, this clear identification speeds up the disconnection of the power source.
In the initial position of the “Stop” button, the circuit is closed. When pressed, the induction coil is disconnected from the current source. The electromagnetic field disappears. The spring returns the armature to its original state while simultaneously opening the main contact group. The secondary closure of the circuit in this section does not matter, since the general break is provided by the “Start” button.
For your information. It should be emphasized that modern starters are compact. Such products are suitable for mounting on a standard DIN rail.
Start button
This control element is produced in black (green) color. In the initial state, the contacts are open. Pressing activates the formation of a magnetic field and the movement of the main contact group. “Self-recovery” ensures the functionality of the working power circuit after the start button is returned to its initial position.
Classic connection scheme
This option is used to solve typical problems. The standard starter connection diagram involves performing certain actions when the control buttons are pressed:
- “Start” – the electromagnet attracts the pad with contact groups, closed circuits supply current to the load;
- “Stop” – the holding of the moving part of the structure by the electromagnetic field stops, the spring returns the block to its original state, and the power to the load is turned off.
If you use a 380V magnetic starter, you can connect a powerful motor or a set of several heating elements. It is permissible to divide the loads into several phases: L1, L2 and L3. In this situation, one should not forget about the uniform distribution of power across individual lines.
In this example, the winding parameters are the same. Therefore, additional calculations of load proportionality are not necessary. Control devices are connected to L1 and the neutral conductor. The voltage in this circuit is 220V (380V between individual phases). For additional protection (not shown in the figure), an automatic circuit breaker is installed at the input, which is selected based on the maximum permissible current.
For your information. You can add a fuse to the circuit in front of the button, which will prevent damage to the coil if the voltage in the power supply network increases significantly.
After briefly pressing the “Start” button, the contact group supplies voltage to the motor windings. The “self-catching” mechanism maintains the working position. The current flow circuit is as follows: L1 – 1 – 2 – self-retaining – 3 – KM – N. To turn off the power unit, press “Stop”, which interrupts the power supply to the load.
To connect an electric motor with a reversible operating mode, use the magnetic starter connection diagram presented below. An added group of controls (Forward and Back buttons) provides power to the windings through different contact groups. The normal direction of rotation or reverse is activated accordingly.
An additional element, thermal relay RT1, prevents damage to the motor when the rotor is jammed or the drive mechanism is overloaded. Heating the control area opens the power supply circuit to the coils (KM1 or KM2). By analogy with the operation of the “Stop” button, the contact groups are disconnected in the phase lines.
Important! This circuit does not protect against short circuits. The corresponding functions are performed by a machine (QF).
Types of electromagnetic starters
To eliminate errors, you need to clarify the names of products in this group. According to current standards, the starter is a fully functional device with control buttons in a housing protected from dust and moisture. Acceptable presence in the kit:
- thermal relay;
- light indication;
- consoles with additional contact groups.
A contactor, by definition in the standards, consists of a drive and a contact group. To control such a product, an external push-button station is used. Some models do not have a protective housing, as they are intended for indoor use. Remote contactor connection can be automated. Additional external components provide signaling of operating modes and emergency situations.
The figure shows how to connect the contactor to the remote control. This method is used to control remote stationary power units and moving mechanisms (overhead crane drives). Starters for three-phase electric motors are divided into groups to quickly identify the appropriate equipment set.
Selection of operating parameters
| Group | Allowable electric motor power (380V), kW | Rated current depending on version, A | |
|---|---|---|---|
| open | closed | ||
| 0 | 1,5 | 3 | 3 |
| 1 | 4 | 10 | 9 |
| 2 | 10 | 25 | 23 |
| 3 | 17 | 40 | 36 |
| 4 | 30 | 63 | 60 |
| 5 | 55 | 110 | 106 |
| 6 | 75 | 150 | 140 |
The picture shows an example of a model with two “Start” buttons (indicated by arrows). Such devices are used to control the direction of rotation of the motor rotor. If necessary, one press activates normal or reverse mode.
Electric starters with thermal relay
These devices prevent damage to connected equipment due to thermal disturbances. In a typical design, a combined plate of two different metals is used. Passing too much current through this element increases the temperature. Since materials differ in linear expansion coefficients, planned deformation occurs. At a certain level, the control circuit (coil) of the magnetic starter breaks. Some thermal relay models have the ability to be adjusted (±25% of the nominal value). The response time ranges from 3 to 25 s.
Design versatility
The previous example demonstrates the possibility of using a starter circuit with a start-stop button to solve various problems. If necessary, standard products can be modernized. By adding external components, they provide indication of modes and protective functions, and interface with automation equipment. The basic design is suitable for connecting inductive and resistive loads, operating with direct and alternating currents. When closed, the contact group does not create significant electrical resistance.
Installation of the device
Products in this category are fixed on a flat vertical surface at a stable temperature. The electrical panel uses a standard DIN rail for installation. When choosing a suitable location, excessive vibrations and accidental mechanical damage should be excluded. If the starter circuit is assembled with a thermal relay, the proximity of heating devices is prevented. When installing cable products in clamps, control the position of the washers, avoiding distortions. Stranded copper wires are twisted and tinning is used. Before starting operation, check the free movement of moving components of the structure.
INkeysestarters for three-phase networks
When working with certain power sources, it is necessary to take into account the voltage for which the inductor is designed. In three-phase power supply networks, 220V control circuits are connected to the phase and neutral conductor. A 380V coil is connected to any two phases.
Service
Some malfunctions of magnetic starters can be recognized by a characteristic humming sound. As a rule, this happens when the connection between the armature and the core is not tight enough. Excessive heating of the case also indicates a malfunction or excessive load current. An increase in temperature provokes a short circuit between the turns of the induction coil, dirt or oxides in the contact group. Be sure to check the quality of the clamping of the connected wires.
Degree of protection
According to this parameter, single-phase and three-phase models are divided into three main groups according to the international classification of the standard IP:
- Open version (IP00) does not provide protection from external influences. Installation in special cabinets or rooms with controlled temperatures and limited humidity levels is acceptable.
- Equipment of the IP40 category requires a housing with holes. Use in unheated rooms is permitted, but protection from moisture must be ensured.
- When marked IP54, the product can be installed outdoors. With the help of a canopy, direct exposure to sunlight and precipitation is prevented.
Safety precautions
Regular testing of starters is necessary to maintain safe operation. Basic Rules:
- work with live installations is carried out using special protective equipment;
- disconnected areas are marked and prevent accidental connection of the power source (remove fuses, provide supervision, post warning signs);
- check the absence of voltage;
- use grounding.
The information presented will help you select and use an electromagnetic starter without errors. At the project preparation stage, it is recommended to clarify the intended purpose of the circuit and operating conditions. To solve complex problems, the serial product is supplemented with display means and other external functional components.
Video
A magnetic starter is a key element in almost every electrical circuit. With the help of a contactor, consumers are connected, loads are controlled remotely and other switching switches are carried out. Depending on the voltage of the control network, they also differ in control voltage: 12, 24, 110, 220, 380 volts. Typically, for connecting three-phase and other loads, there are contacts L1, L2, L3 and auxiliary NO or NC. The small-sized starter is controlled manually or by various automatic devices, such as time relays, light relays, and others. Below we will look at some diagrams for connecting a magnetic starter for 220 and 380 volts, which may be useful at home.
Overview of options
In manual mode, activation is carried out from a push-button station. The start button opens the contact to close, and the stop button works to open. The connection diagram for a self-retaining magnetic starter is as follows:
Let's consider the operation of the on and off circuits of a magnetic contactor. A push-button station of two buttons, when you press START, the phase comes from the network through the STOP contacts, the circuit is assembled, the starter retracts and closes the contacts, including the additional NO, which is parallel to the START button. Now, if you release it, the magnetic starter continues to operate until the voltage disappears or the motor protection P is triggered. When STOP is pressed, the circuit is broken, the contactor returns to its original position and the contacts open. Depending on the purpose, the power supply to the coil can be 220V (phase and zero) or 380V (two phases), the operating principle of the control circuits does not change. Switching on a three-phase electric motor with a thermal relay through a push-button station looks like this: 
In the end it looks something like this, in the picture:
If you want to connect a three-phase motor through a magnetic starter with a 220-volt coil, you need to make the switch according to the following wiring diagram:
Using three buttons on the control panel, you can organize the reverse rotation of the electric motor. 
If you look closely, you can see that it consists of two elements of the previous diagram. When you press START, the KM1 contactor turns on, closing the NO KM1 contacts, becoming self-retaining, and opening the NC KM1, excluding the possibility of turning on the KM2 contactor. When you press the STOP button, the chain is disassembled. Another interesting element of the three-phase reversible connection circuit is the power section. 
On the KM2 contactor, phases L1 are replaced by L3, and L3 by L1, thus changing the direction of rotation of the electric motor. In principle, this circuitry for controlling three-phase and single-phase loads completely covers household needs and is easy to understand. You can also connect additional automation elements, protection, limiters. They all need to be considered separately for each specific device.
Using the above diagram for connecting a magnetic starter, you can organize the opening of a garage door by introducing additional limit switches into the circuit, using NC contacts in series with NC KM1 and NC KM2, limiting the movement of the mechanism.
Connection Instructions
The easiest connection option is through a button. In this case, you need to act as shown in the video:
We connect the starter via a push-button post (without reverse)
In an example with an engine it looks like this:
380 Volt electric motor control
You can connect the motor using a reverse circuit as follows:
Turning on the engine via three buttons
Using this principle, you can independently connect the device to a 220 and 380 volt network. We hope that our instructions for connecting a magnetic starter with diagrams and detailed video examples were clear and useful for you!
