A magnetic starter is a device for remote control of power loads (most often electric motors). In a car, the starter is designed to control an asynchronous electric motor with a squirrel-cage rotor. In addition, the starter provides motor overload protection and signaling about its operation. Starters differ in purpose, availability of additional functions, resistance to external influences, current value, operating voltage.
Instructions
Step 1
Selection by series of electromagnetic starter. Of the domestic starters, the most common are PML, PM12 and PMU. From foreign - Siemens, Legrand and ABB.
Step 2
The choice of a starter for the load current that it is capable of switching (turning on and off). For cars, starters of 1 magnitude are used with switching currents of 10 and 16 A. Please note that this value must be greater than the maximum current of an electric motor or other electrical appliance.
Step 3
The choice of the starter according to the operating voltage of the coil, which must correspond to the voltage of the electrical circuit of the car. In this case, the standard voltage value is ~ 24 V.
Step 4
Selection of the starter by the number of auxiliary contacts, which should be equal to the number of contacts in the control circuit. Make and break contacts are counted separately. If the number of contacts is not enough to connect to the control circuit, you can use a specialized attachment. This attachment slows down the operation of the contacts for a short time and the starter can be used as a time relay.
Step 5
Selection of a starter according to the degree of protection against harmful environmental influences (IP).
Step 6
The choice of a starter for the presence or absence of a thermal relay depends on whether the technological mode of operation of the controlled electric motor allows overload.
Step 7
The choice of a starter for the presence or absence of reverse depends on whether the controlled electric motor is reversible or not.
Step 8
The choice of a starter for additional control elements (buttons, signal lamps) depends on the user's preferences and operating conditions.
Step 9
The choice of a starter according to the class of endurance depends on whether it will be intended for switching the load in the mode of frequent operation. With a large number of starts and stops per hour, it is recommended to choose non-contact starters.
