Turning on the magnetic starter. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Turning on the magnetic starter. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Electrician's Handbook

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The coils of magnetic starters are designed for an operating voltage of 220 or 380 V. In practice, there are cases when a magnetic starter is designed for one voltage, but is needed for another. To connect starters without modification, connection diagrams shown in Fig. 1 and Fig. 2 are offered.

Turning on the magnetic starter

In Fig. 1, a starter with an operating voltage of 380 V is connected to a 220 V network through a diode. Although the KM coil receives a reduced voltage, the influence of its reactance is significantly reduced and the magnetic starter operates quite stably.

When you need to connect a magnetic starter with an operating voltage of 220 V to a 380 V network, resistor R1 is connected in series with the coil (Fig. 2). Its resistance depends on the resistance of the magnetic starter coil and is determined from the expression:

R1=Rkm/0,3,

where Rkm is the resistance of the coil.

For example, if Rkm=500 Ohm, then R1=500/0,3=1500 Ohm. Resistor R1 is a wirewound type PEV-10.

Author: V.F. Yakovlev

See other articles Section Electrician's Handbook.

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