| 摘要 |
PURPOSE: An OLP(Over Load Protect) in a compressor is provided to protect a compressor by not operating the compressor if an outdoor fan motor is not driven by a short circuit of a temperature fuse. CONSTITUTION: A three-phase input power supply supplies power to each compressor through magnetic contacts and to an indoor fan motor and outdoor fan motors via plural power relays. A main PCB(Printed Circuit Board) assembly controls the turning-on/off states of the magnetic contacts and the power relays to drive the compressors, the indoor fan motor and the outdoor fan motors. Plural temperature sensors are mounted on the indoor fan motor and the outdoor fan motors to turn on/off the motors according to temperature changes. Thereby, the motors are protected from overheating. Plural temperature fuses are connected to each power line of the power relays from the three-phase input power supply. The temperature fuses are snapped if excess current flows to the indoor fan motor and the outdoor fan motors. Therefore, the motors are protected.
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