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US 8,475,136 B2Granted
Compressor protection and diagnostic system
AssigneeEmerson Climate Technologies, Inc.
InventorNagaraj Jayanth
Life of this patent
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Abstract
A compressor includes at least one current sensor and processing circuitry in communication with the at least one current sensor. The processing circuitry declares a locked rotor condition when current drawn by the compressor is at least forty percent of peak locked rotor current.
Claims23
A compressor comprising:
- at least one current sensor;
- and
- processing circuitry in communication with said at least one current sensor and operable to declare a locked rotor condition when current drawn by the compressor is at least forty percent of peak locked rotor current, said processing circuitry recording said peak locked rotor current as a highest current reading taken during a predetermined time period following start up of the compressor.
A method comprising:
- starting a motor of a compressor;
- recording current drawn by said motor for a first predetermined time period following said starting;
- comparing the highest current drawn by said motor during said first predetermined time period to running current drawn by said motor following said first predetermined time period;
- and
- determining whether said running current exceeds at least forty percent of said highest current.
2 more elements
Dependencies are inferred from the claim text.