Inflating the balloon To infl ate the balloon, three 1,5 kW fans were used. Initially, the fans should rotate at a capacity of 100%, but as the pressure in the balloon becomes higher, the fan speed is controlled in such a way that the pressure in the balloon remains at 5 mBar. To realize this pressure sensor, a controller and a control module for each fan were required. The alarm signal had to be observed from a distance and therefore it was reported by light and sound signals. All control equipment was built in a cabinet. Besides the mentioned control components this cabinet also contains a heating element, power circuit breakers, various relays and a UPS system. The UPS maintained the power to secure control/regulation in case of power failure. Together with Sick, Van Dooren Engineering, Wago, Cofely and Maco technologys, Summa College have provided us an important piece of engineering. 22
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