Remote monitoring during operation For years, energy-saving fans from ebm-papst have been the first choice when it comes to reliable cooling in supermarkets. They are proven axial fans designed for installation beneath the shelves in refrigerated and deep-freeze cabinets. With their new serial interface for MODBUS RTU communication, many monitoring, control and regulation functions can now be performed remotely during operation and in real time, enabling operators to adjust operating parameters quickly in order to respond promptly to changing situations such as day/night mode or frequent opening of the doors at times of high demand. Preventive maintenance to avoid downtime Recording the operating time facilitates preventive maintenance for effective avoidance of downtime. Should servicing still be needed, the affected fans are easily recognized thanks to MODBUS RTU communication. Fail-safe functionality enables safe operation even in the event of a bus communication failure; the fans simply continue to run at the configured speed. Additional energy savings through reduced demand for refrigeration With networked devices, overall system efficiency can be significantly increased by demand-based speed control of individual units. Specific speeds can be set in switching mode via RSA and RSB. Reduced demand for refrigeration power correspondingly reduces the amount of power needed by the compressors, with positive effects on total energy consumption. Mechanical compatibility The impellers are aerodynamically optimized, making the fans very quiet. Moreover, the energy-saving fans need no paint – a bonus for the environment. The new MODBUS RTU version is mechanically compatible with the existing ESM series. Its 24 VDC power supply and simple plug & play connection to building control systems make it easy to install and highly versatile. The fans will be available as of July 2017.