SYSTEM OF AIR-COOLING APPARATUS CONTROL Russian patent published in 2010 - IPC F04D27/00 

FIELD: power industry.

SUBSTANCE: air-cooling apparatus control system (CS) comprises heat-transfer device with cooled medium inlet and outlet manifold, SC temperature sensor, electrically driven fans, power supply and supply frequency transducer. When all motors are operating, electric supply to each motor is provided from circuit switch. Its first input is connected to the first output of switching unit, the second one - to power supply, and the third - to the first output of frequency transducer. The first input of frequency transducer is connected to power supply, the second one - to output of temperature regulator. On its first input comes cooled medium required temperature signal, on the second one - from CS temperature sensor. On the first input of switching unit comes the signal from the second output of frequency transducer, informing about switch parametre value. If its value is maximum, signal is generated from the first output of switching unit to the first input of circuit switcher to switch the supply of the motor from frequancy transducer to constant frequency power supply. If this value is minimum the signal is generated to switch the supply of the motor to frequency transducer.

EFFECT: invention enables the usage of one frequency transducer to supply energy to a group of motors, their number in a group shall vary depending on consumed power of working fans, necessary for operating medium cooling.

3 cl, 2 dwg