| 摘要 |
PURPOSE:To prevent temprature a detection error due to the length of bad wire a thermo-sensitive device, and malfunction due to introduction of noise, by splitting a temperature detecting controller into a detection section and a control section, and placing the thermo-sensitive device chose near the detection section. CONSTITUTION:In the detection section, the temperature difference between a temperature detection section and a temperature set section 2 is compared at a comparison section 3, and when the result of comparison is logically positive, the section 3 absorbs a constant current Is from a current split section 9 and when negative, the section 3 does not absorb it at all. Further, a current voltage conversion section 8 always absorbs a constant current Ip from the section 9 and converts it into a constant voltage being Vp as the power supply for the sections 1,2 and 3. Thus, a current of Im=Is+Ip or Im=Ip flows to a jumper 10 accroding to the result of the section 3. In a control section B, whether or not the signal current Is is included is discriminated at a current detection section 11 and when the Is is included, an auxiliary relay 6 is activated. |
