Controls and operation of variable frequency drives
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United States of America Patent
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Aug 18, 2020
Grant Date -
Aug 10, 2017
app pub date -
Apr 24, 2017
filing date -
Mar 11, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A system includes a refrigerant compressor, an electric motor and configured to drive the refrigerant compressor, and a controller. The controller is configured to operate the compressor in a liquid clearing start mode where electrical current through the motor is prevented from exceeding a predetermined current limit for a period of time not to exceed a predetermined period of time, and is configured to operate the compressor in a run mode in response to determining the motor exceeds a predetermined speed threshold at or before expiration of the predetermined period of time, wherein the run mode does not prevent electrical current through the motor from exceeding said predetermined current limit.
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