Compressor diagnostic system
AssigneeCopeland Corporation
InventorsNagaraj Jayanth, Hung Pham
Life of this patent
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Abstract
A refrigeration/air conditioning system includes a compressor having a motor protector which stops the compressor's motor when it senses an out of specification condition. A diagnostic system of the refrigeration/air conditioning system monitors the status of the motor protector. The diagnostic system includes logic circuitry that diagnoses the type of problem the compressor or the system is having based upon the running times and status of the motor in conjunction with the times and status of the tripped motor protector. The diagnostic system also includes either a discharge pressure sensor or a condenser temperature sensor, an ambient air sensor and a voltage sensor. The sensors provide information to the diagnostic system which enables it to determine where a system fault has occurred.
Claims37
A diagnostic system for a compressor assembly including a compressor and a motor protector, said system comprising:
- a demand signal sensor;
- a current sensor;
- and
- logic circuitry associated with said current sensor, said demand signal sensor, and the motor protector, said logic circuitry operable to determine the trip frequency of the motor protector and identify a specific fault cause.
A diagnostic system for a compressor assembly including a compressor and a motor protector, said system comprising:
- a demand signal sensor;
- a current sensor;
- and
- logic circuitry associated with said current sensor, said demand signal sensor, and the motor protector, said logic circuitry operable to determine the average ON time of the compressor and identify a specific fault cause.
A diagnostic system for a compressor assembly including a compressor and a motor protector, said system comprising:
- a demand signal sensor;
- a current sensor;
- and
- logic circuitry associated with said current sensor, said demand signal sensor, and the motor protector, said logic circuitry operable to receive an output of said current sensor and an output of said demand sensor, derive a motor protector trip frequency from said received current and demand signal, and identify a specific fault cause.
A diagnostic system for a compressor assembly, said system comprising:
- a demand signal sensor;
- a main winding current sensor;
- an auxiliary winding current sensor;
- and
- logic circuitry associated with said demand signal sensor, said main winding current sensor, and said auxiliary winding current sensor, said logic circuitry outputting a compressor operating condition signal based on input received from said demand signal sensor, main winding current sensor, and auxiliary winding current sensor.
A method for diagnosing a compressor assembly including a compressor and a motor protector, said steps comprising:
- sensing a demand signal;
- sensing a current;
- analyzing said sensed demand signal and said current;
- determining a trip frequency of the motor protector;
- and
- identifying a compressor fault cause.
A method for diagnosing a compressor assembly including a compressor and a motor protector, said steps comprising:
- sensing a demand signal;
- sensing a current;
- analyzing said sensed demand signal and said current;
- determining an average ON time of the compressor;
- and
- identifying a compressor fault cause.
A method for diagnosing a compressor assembly including a compressor and a motor protector, said steps comprising:
- sensing a demand signal;
- sensing a current;
- analyzing said sensed demand signal and said current;
- deriving a motor protector trip frequency from said sensed current and demand signal;
- and
- identifying a compressor fault cause.
Dependencies are inferred from the claim text.