Electrical Machines - Basic vocational knowledge (Institut für Berufliche Entwicklung, 144 p.): 5. Asynchronous motors: 5.4. Circuit engineering: 5.4.3. Rotational reversing circuit

Electrical Machines - Basic vocational knowledge (Institut für Berufliche Entwicklung, 144 p.)

5. Asynchronous motors

5.4. Circuit engineering

		5.4.1. Starting connections
		5.4.2. Dahlander pole-changing circuit (speed control)
		5.4.3. Rotational reversing circuit
		5.4.4. Braking circuits

5.4.3. Rotational reversing circuit

Mode of operation

Cp. section 5.3.4.

Circuitry

Figure 73 - Rotational direction turnover voltage (main circuit)

Figure 74 - Rotational direction turnover voltage (control circuit)

Circuitry description

Rotational direction selection without cut-off compulsion. The K1 is switched clockwise by actuating S3. K2 is locked in current path three by the openers of K1 and S3. K2 drive is switched counterclockwise by dead and simultaneous actuation of S2 and K1.