Signalling instead of switching
The stadium’s plant operators chose a solution which works on the principle of “signalling instead of switching”. This is in order to ensure that, even if a fault occurs during a match as a result of fault currents, for example, the entire floodlight system will not be shut down, nor will all the lights in the stands go out. In the event of a fault, a message is sent to the building services management system via the CAN bus; this message is then displayed by the management system so that an engineer can take corrective action in a timely manner.
Specifically, 10 residual current monitors of the RCM420-D2 series, which continuously monitor the AC system with 140 kW power. 41 floodlight units, each of 2000 W, are connected to the system for lighting the pitch and TV screens alone. Another Euro 2008 stadium, Wals-Siezenheim, which was finished in 2003, has just under 19,000 seats and is home to “Red Bull Salzburg”, uses residual current monitors of the RCM470LY series to monitor its floodlight system.