A magnetic starter is a device designed for remote control of various power loads, for example, electric motors, electric heating devices, powerful lamps.
Instructions
Step 1
Use the following diagram to connect an irreversible magnetic starter. Figures a and b show the schematic and wiring diagrams for connecting the starter. This device is designed to control an asynchronous electric motor. The boundaries of the apparatus are outlined with a dashed line.
Step 2
Switch on the magnetic starter according to the diagram, for this, connect the KM contactor and the three main make contacts. Next, connect the main circuits in which the motor current flows. In the diagram, they are indicated by bold lines. Coil supply circuits are indicated by a thin line.
Step 3
Press the Start button to turn on the motor. In this case, a current should flow through the circuit of the starter coil, and the armature should be attracted to the core. After that, the main contacts of the motor power supply circuit will close. At the same time, contact 3 - 5 will be closed. This, in turn, will create a supply circuit for the coil.
Step 4
After that, release the "Start" button, the starter coil should turn on with its own auxiliary contact. This is called a self-locking circuit. After the voltage is restored, press the "Start" button again.
Step 5
Connect the reversing starter if the motor uses two directions of rotation. To do this, follow the second diagram. To reverse the direction of rotation, reverse the phase rotation order of the winding. This starter uses two contactors, namely KM1 and KM2.
Step 6
Provide a blocking circuit to avoid short circuits. To ensure the reliable operation of the circuit, ensure that the KM1 contacts are opened before the KM2 auxiliary contacts are closed, for this, use the position adjustment of the auxiliary contacts, which are located along the armature.
