| 摘要 |
<p>PURPOSE:To ensure the stable actuation of a temperature controller in an ambient temperature change by controlling a fan in order to secure the affection of the heat of a heat generating part to a subject part for temperature control when a temperature sensor senses a temperature drop less than a prescribed level and then to prevent the affection of said heat to said subject part when the sensor senses a temperature rise higher than a prescribed level. CONSTITUTION:The heat of a temperature controller is generated from various circuit blocks 5. The heat generated from the block 5 is cooled by the open air supplied through a venthole 2 and discharged outside through vent fans 11-10. When a comparator 14 delivers an output due to a drop of the ambient temperature, a transistor TR16 is turned on to drive a relay 17. While a vent fan morot M1 is stopped and adverse voltage -12V is impressed to a motor M2. Thus the M2 is reversed to raise the temperature within a temperature controller. When a comparator 15 delives an output owing the a rise of the ambient temperature, a TR18 is turned on to drive a relay 19. Then the higher voltage +24V is impressed to both motors M1 and M2. Thus these motors are revolved at higher speeds to set the temperature at a lower level inside the controller.</p> |
