Editor's Choice

Future-proof chair lift system

Fourth Quarter 2019 Editor's Choice Electrical switching & drive systems & components

At Snow Space, a winter sports resort near Salzburg, Bergbahnen Wagrain operates the Sonntagskogelbahn 2, a chair lift for taking skiing enthusiasts to the piste. New innovative drive technology guarantees the comfort and the safety of the customers. To provide the most comfortable ride possible to the summit for the skiers, the new chair lift has been fitted with efficient Siemens drive technology by the system integrator Frey Austria. The core element in the solution is ultra-modern frequency converter technology in which the frequency converters are optimally matched to the new synchronous servo motors. The redundant design of the system increases not only the availability of the chair lift but also the passenger safety.

Since the 2018/2019 winter season, it has been possible to transport eight skiers to the summit in each gondola on the new high-tech Sonntagskogelbahn 2 chair lift instead of just four. This has been made possible by, amongst other things, the use of modern Siemens drive technology, which has dispensed with a transmission between the electric motor and the pulley. Comfort is increased by precision speed control with encoder feedback. This is the first time this combination has been used. It makes transmission maintenance a thing of the past and offers optimum control options, and it also differentiates the Sonntagskogelbahn 2 from the other chair lifts.

At the heart of the drive for the new ski lift are redundant Sinamics S120 Cabinet Modules-2 from Siemens. Synchronous motor (90 pole) from Doppelmayr.

Ultra-modern, new drive technology

The gearless drive solution, consisting of a synchronous motor (90 pole) from Doppelmayr and two Sinamics S120 Cabinet Modules-2 redundant frequency converter cabinets, form the technical heart of the chair lift. The system comprises two Sinamics S120 Active-Line Modules and two recently developed S120 Chassis-2 Motor Modules. The most significant benefits of these new devices are the smaller footprint, the sturdy overall design, and efficient operation combined with easier service. In addition to this, there is a considerable reduction in weight – ultimately each of the Sinamics S120 Chassis-2 has a reduced weight, from 450 kg down to 160 kg.

The sturdy overall construction of the frequency converters also significantly reduces the derating and the noise generated by the motors. The control is provided by a fail-safe Simatic S7-1500F controller combined with a distributed I/O Simatic ET 200S. Frey uses a TP-700B touch panel to operate the system. Frey is Siemens’ solutions partner from Innsbruck and is responsible for the electrical engineering solution for the drive, automation and visualisation, as well as the system engineering. The engineering for the whole solution is completed in the Siemens engineering framework, the Totally Integrated Automation (TIA) portal.

Redundant system design for maximum safety

The Sonntagskogelbahn 2 has two identical direct motors arranged concentrically and vertically above each other. They are mechanically connected to each other via a central shaft. Two Sinamics S120 power supplies and two Sinamics S120 Chassis-2 motor modules can be alternately connected to each other so that the required double redundancy is provided not only for modular drive but also for drive control. “If a part fails, the operators are still able to run the system empty to ensure the safety of people in the lift,” explains Karl Prammer, CEO at Frey.

Project success launches future plans

“The Sonntagskogelbahn 2 is currently the most innovative chair lift we operate here,” says Wolfgang Hettegger, CTO at Snow Space Salzburg. The chair lift transports approximately 3600 people in 38 gondolas per hour up over 200 metres to the Sonntagskogel – around 25 percent more passengers than the previous arrangement.

It is therefore understandable that the next two projects are already on the drawing board – the Sonntagskogel 3 and the Flying Mozart.

For more information contact Jennifer Naidoo, Siemens Digital Industries, +27 11 652 2795, jennifer.naidoo@siemens.com, www.siemens.co.za


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