"An abrupt start or stop of motors can often cause serious problems due to mechanical impact on the machine or voltage dips in the power supply system. As part of a smart electrical infrastructure in buildings and industrial plants, the new soft starters from the Sirius portfolio offer a softer, and even safer alternative, preventing malfunctions and downtimes," said Erich Fröhlich, Product Manager at Siemens Smart Infrastructure, Business Unit Control Products.
The Sirius 3RW55 Failsafe soft starters are suited for starting and stopping operations of high-power motors with a rated output of 5.5 to 560 kilowatt (kW) at 400 volts (V). All switching operations can be controlled simply, in a user-friendly manner, via the integrated human-machine interface (HMI). Optional communication modules allow for function expansions as needed, for example offering a complete diagnosis, statistic data and measuring values for an automation system.
The Sirius 3RW50 devices have a compact, space-saving design with minimal power loss. They cover a power range from 75 kW to 315 kW at 400 volts (V) and are designed for standard applications. Additional functions can be added via optional communication modules. The integrated soft torque function helps prevent current surges at startup and reduce mechanical loads when starting and stopping motors. This makes soft starters ideal for turning on pumps because they prevent pressure spikes in the pipe system and potential damage resulting from water hammer. They are ATEX- and IECEx-certified and can also be used for applications in potentially explosive areas, for example, at airports or gas stations, when pumping kerosene or gasoline.