A Series 956 odditymtu
distributor K&W installs and maintains the engines. "When the engines are first installed, we have a five-year maintenance contract with Wiener Linien," Tomes recounts. "After that, the contract is put out to tender on a yearly basis." The K&W fitters are given special training for the Series 956. "What is special about these engines is their impressive size," states K&W service mechanic Lukas Sajdak with obvious pleasure. "Technically the engine has a lot to offer. It is monitored and controlled by mtu
's own ADEC-Uni engine management system, it has eight integrated turbochargers and an air starter system that starts the installation in under ten seconds." For mtu
the engines for the Vienna underground were a new challenge. "It was the first time we had technically configured the engines for such a backup power application," relates project coordinator Giovanni Coiro of MTU Friedrichshafen. "Before then, the Series 956 engines were only used in ships and nuclear power plants. Here, entirely different demands are required." In particular, the engines' self-monitoring systems played a major role in this case, as previously the controller was connected to an external source. "With the help of the new ADEC-Uni control unit, the engine was designed to be able to analyze the signals immediately and respond accordingly." So Wiener Linien received one of the first Series 956 engines to be used for such an emergency-backup application. "Especially in this emergency power sector, every engine is a one-off," Coiro points out. "In contrast with standard production units, for this type of application every engine has to be specially adapted to the client's requirements." In the case of the Vienna underground, those requirements were clear. The power has to stay on to ensure all the people can safely get out of the stations.