FIELD: various industries and farming; ventilation plants used by several a consumers connected according to accidental law. SUBSTANCE: total resistance of series resistors is used as control parameter. Above-mentioned resistors are connected to control circuit by means of limit switches. Resistance of each resistor is formed according to flow rate of air through respective branch and losses of pressure in branch and is determined from the proposed formula. It is changed in proportion relative to total resistance through change of angular velocity of rotation of electric motor. EFFECT: enhanced reliability. 1 dwg
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