| 摘要 |
PURPOSE:To enable an abnormal temperature section to be easily specified, even when a power source is interrupted and a temperature is normally reset, by retaining the abnormal state detecting signal of an ambient temperature with a relay. CONSTITUTION:In an abnormal temperature detecting circuit 1-i (i=1-m), a thermostat 11-i is turned ON when an ambient temperature is turned abnormal, and by main current from the internal power source 61 of a power source controlling section 6, a relay element 12-i is excited, and a contact 13-i is turned ON, and the relay element 12-i is self-retained. Then, a luminous diode 17-i is lit. Via a diode 14-i, the ON/OFF of the relay contact 13-i is informed to the power source controlling section 6, and by the power source controlling section 6, the power source of a circuit is interrupted at the time of the generation of an abnormal state. Even if a temperature is lowered due to the power source interruption and the thermostat 11-i is turned OFF, the relay element 12-i is self-retained, and so an abnormal state generating section can be known. |
