| 摘要 |
PURPOSE:To increase an operation range at the time of the operation control of two compressors by stoppingly controlling the compressor on an inverter side while performing the capacity control of only the compressor on an unload mechanism side in accordance with a load at the time of an emergency with an inverter in failure. CONSTITUTION:At ordinary times, the total target capacity of both compressors is operated by an operating means 50, to carry out capacity control. At the time of an emergency when an inverter 15 is in failure, an emergency control means 56 is prior to a control means 51 and the operation of the compressor 1 on the inverter 15 side is stoppingly controlled. Also, the capacity of the compressor 2 is adjusted to be a capacity value close to a target value by means of an unload mechanism 2a. Thereby, even at the time of an emergency, it is possible to carry out an operation in accordance with a load from at the time of low load. |
