Frequency converter in comfort version with integrated, all-pole sine filter. For speed control of one or more fans. The permissible number of fans results from the maximum frequency converter current. Includes display and three control buttons for setting the fan and control parameters. Parameterization and control option via Modbus. With integrated, full control system for temperature, pressure and air speed. The required sensors LDF 500, LGF 10, LT.. are available as accessories. The speed is specified via the 0-10 V control signal (e.g. potentiometer PU/PA, accessory). Cable length between FU-CS and fan over 10 m possible. No additional EMC shielding of the electrical cables required. The fans including motor do not require any special EMC precautions for frequency converter operation. When using the frequency converter with integrated sine filter, conventional standard fans/motors can be used.