| 摘要 |
PURPOSE: To make it possible to supply electric power to a compressor main body by enabling the detection of a reverse phase produced by contact in a practice panel with high accuracy. CONSTITUTION: There is installed a practice panel 30 for practice assembling, which is provided with a main circuit 31 switchably connected to an outside main wiring 21 and an air conditioner main body 40 is connected to the practice panel 30. There is installed a negative detection unit 50, which transmits a stop signal which halts the supply of power to the air conditioner main body 40 to a control circuit of the practice panel 30, is directly connected to the compressor main body 40 and separately installed to the practice panel 30 when the source power of the air conditioner main body 40 is a negative phase. The negative phase detection unit 50 outputs a time lagged positive logic signal when the air conditioner main body 40 starts and outputs a negative logic signal when the source power of the air conditioner main body 40 is a negative phase. A protection circuit 60 outputs a break signal with time lag to a control circuit based on a logical product between the positive logic signal and the negative logic signal of the negative phase detection unit 50. |
