G - Physics – 05 – D
Patent
G - Physics
05
D
341/28
G05D 23/01 (2006.01) H01H 47/00 (2006.01) H02H 3/05 (2006.01)
Patent
CA 1038949
A B S T R A C T The disclosure describes an improved apparatus and method for protecting the motor of a refrigerant compressor. The apparatus includes first and second magnetic contactors which are connected in series between a source of three-phase AC voltage and the compressor motor. If one of the contactors falls in the closed position, the other contactor will open to protect the compressor motor. Control circuitry normally operates the contactors simultaneously so that each of the contactors is periodically opened and closed in accordance with the demands for operation of the compressor. By using this technique, the reliability of the contactors is improved and the motor is protected against overload conditions. One of the contactors may be controlled by a pressure sensor in the suction line of the compressor, so that the compressor motor can be turned off by a decrease in suction line pressure if the other contactor fails in the closed position.
220452
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