Screw compressor

Abstract

The invention revealed a screw compressor and its electrical control system and related control methods. The system comprises a power module, a high-low (tension) transformer and a compressor wiring control circuit. The high-low (tension) transformer connects the power module to provide at least two different voltages: low voltage and high voltage; the compressor wiring control circuit connects said high-low (tension) transformer to control the switching and connection mode of said wiring terminals of the compressor; When the first voltage is connected to the screw compressor, the connecting circuit formed by the wiring terminals which are controlled by a connecting unit will be in the first status. When the second voltage is connected to the screw compressor, the connecting circuit formed by the wiring terminals which are controlled by a connecting unit will be in the second status. The electrical control system of the compressor revealed by the invention can easily realize the switching of low and high voltage by changing the jumpers on the wiring terminals of the patch board with no need to change the connection mode of the motor.

Dependencies are inferred from the claim text.