| 摘要 |
PURPOSE: A compressor diagnostic system is provided to secure an instrument of low cost for preventing wrong diagnosis and improve accuracy in diagnostic problems of an air conditioning or refrigerating system. CONSTITUTION: A refrigeration/air conditioning system includes a compressor having a motor protector which stops the compressor's motor when the refrigeration/air conditioning system senses out of specification condition. A diagnostic system(100) of the refrigeration/air conditioning system monitors the status of the motor protector. The diagnostic system includes logic circuitry(104) diagnosing the type of problem, 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(334) and a voltage sensor(404). The sensors provide information to the diagnostic system to determine where a system fault has occurred.
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