| 摘要 |
1. A temperature control system for the heating of precast elements in a precast building units plant in which signals from the air temperature sensor in the controlled object and from the ambient temperature sensor are sent to an electronic control device which, by means of a switching set, controls the supply of a heating medium to the object and which also controls the fan drive, wherein the control error signal, after being processed in the control error amplifier (8), discriminator (9) and gating circuit (10), is sent to the element switching-on circuit (19) after being made dependent, in the gating circuit (10), on the signal received from the comparator (17) which compares signals received from the object-temperature sensor (11) and transformer (12) as well as the ambient-temperature sensor (15) and transformer (16) whereupon, from the element switching-on circuit (19) which, additionally, receives signals from the select-work-type circuit (20) and from the failure detection circuit (25), the processed control error signal is sent to the elements...<IMAGE>
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