| 摘要 |
PURPOSE:To lengthen the life of a display tube and the like and allow the storage shed to maintain an alarm display function by allowing a cooling controller to make a storage shed temperature alarm display no operation in principle when lightsout is performed and permitting it to give a priority to an alarm display at the time of temperature abnormality. CONSTITUTION:Storage shed illuminating lamps 10, 11 put on/off by a switch 13 and a (high, low) alarm display 12 at the time of storage shed temperature abnormality are provided in a low temperature storage shed 1. The inside of the storage shed is controlled at a proper temperature with the use of a refrigerator 14. At the time of suspending business the illuminating lamps are put off to input a put-off signal of the switch 13 in an electronic controller so as to stop the function of fluorescent display tube of an alarm display. However, when the storage shed temperature is abnormal, the controller is controlled so as not to output a no-operation signal of the fluorescent display tube. Accordingly, the life of the fluorescent display tube can be lengthened to maintain the alarm function of abnormal temperature so as to heighten reliability. |
