As versatile as your application

Example: Compressors

The evaluation of the electrical data and motor active power of our soft starters enables condition monitoring, which gives you a new type of transparency over the status of equipment. Based on the measured data you can, for example, determine whether a pump is running dry, the oil or lubricating film on compressors is wearing off, or a ball bearing is showing signs of impending damage.

Example: Conveyor belts 

The soft startup of conveyor belts must constantly adjust to new conditions as the starting weight changes. The SIRIUS 3RW5 soft starters simplify this task with their auto-parameterization function. By analyzing the startup, the soft starter identifies the load conditions and sets the appropriate values for optimally starting the belt.

Example: A sawmill

The slow and heavy saw blades used in industrial sawing plants require a soft starting function to protect electrical and mechanical systems. At the same time, it must be possible to stop saw blades quickly, for example, changing blades. Thanks to its integrated brake function, the 3RW55 automatically supports DC braking and reverse braking, including the control of components such as braking contacts and reversing contactors.

Example: Wastewater 

Pumps are used to convey liquids in a variety of applications. In wastewater applications, dirt and particles in the wastewater can be deposited on the pump blade wheels and reduce pumping capacity and productivity. The pump cleaning function prevents this from happening; integrated measurement technology detects the dirt and changes the pump’s direction of rotation as soon as defined limit values are exceeded.

Example: Water supply

When pumps are used to convey large volumes of water in the public water supply system; for example, for buildings or pump stations, shutting them down is challenging. Based on their design, these pumps stop immediately which can result in “water hammers” in pipes, couplings, valves, and seals caused by the kinetic energy of the conveyed volume in the piping system. To prevent damage, 3RW52 and 3RW55 soft starters have a pump stop function that makes it possible to bring pumps to a controlled stop.

Example: Fans 

Fans for air conditioning systems, buildings, tunnels, and parking garages are generally very large and heavy, which means that they sometimes require several minutes to start. This can occasionally result in supply voltage dips. Soft starters themselves require a control supply voltage of 230 V and a primary voltage of 400 V. The SIRIUS 3RW30/40/5 soft starters include wide-range voltage versions, such as 110 to 250 V AC for the 3RW52/55. This means that even in the case of a voltage dip, the soft starter and the motor and application are guaranteed to operate. Thanks to the electrical robustness of our soft starters, operation is also guaranteed in power supply networks with occasional power dips.

Relay switching technology is characterized by low power loss. Because of the high power requirements for startup and shutdown, this technology has a short service life and high noise emissions.

In contrast to relay switches, semiconductor-based switches have a longer service life and lower noise emissions but experience high power loss in operation.

The hybrid switching technology of the Siemens soft starters integrates the advantages of both technologies. By combining relay and semiconductor technology, it enables a long service life, low noise emissions, and low power loss.