Detection and correction of reverse operation of a compressor in a refrigeration system
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United States of America Patent
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Jul 24, 2012
Grant Date -
Nov 26, 2009
app pub date -
May 22, 2009
filing date -
May 23, 2008
priority date (Note) -
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Abstract
A method and system for detecting and correcting unintended reverse or backward operation of an electric motor driven scroll compressor of a refrigeration system is characterized by monitoring the pressure at a suction side of the compressor during operation of the refrigeration and determining whether the pressure, after a first time interval following startup of the compressor, exceeds and remains in excess of a predetermined upper pressure limit for at least a second time interval. If it does, the compressor is turned off for a third time interval and is then restarted. The foregoing is repeated and if the compressor is turned off a selected number of times because of successive occurrences of high suction side pressures during operation of the refrigeration system in a chilling cycle, an error indication is generated and the refrigeration system is shut down.
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