Characteristics: • Converters for speed and frequency variation of axial and centrifugal fans with asynchronous three-phase motors. • Converter power supply: • Single-phase (VSD1/A-RFM): 200-240 V 50/60 Hz. • Three-phase (VSD3/A-RFT): 380-480 V 50/60 Hz. • In accordance with the Electromagnetic Compatibility Directive 2014/30/EU, the Low Voltage Directive 2014/35/EU and the Machinery Safety Directive 2006/42/EC. • Stop/start input to disable/enable the drive. • 0-10 V input for speed control. • ModBus RTU bus connection available. • Standard model with degree of protection IP20. Also available in IP66 version up to 10 HP. For powers greater than 15 HP, only available with protection degree IP55. • According to norms: • UNE EN 61800-3: variable speed electric power drives. EMC related product standard including specific test methods. • UNE EN 61800-5-1: variable speed electric power drives. Security requirements. Electrical, thermal and energy. • UNE EN 60204-1: safety of machines. Electrical equipment of machines. General requirements. • UNE EN 55011: limits and methods for measuring the characteristics related to radio electric disturbances of industrial, scientific and medical devices (ICM) that produce radio frequency energy. • IEC 60529: specifications for degrees of protection in enclose premises.
In general, all SODECA fans with three-phase motors are adequate for operating supplied with a static frequency converter in normal execution (based on IEC 60034-17). However some motors require special measures. The maximum operating frequency or speed must never exceed that of the fan design. In applications with a quadratic torque such as fans and pumps, when the speed changes, the absorbed power is directly proportional to the rotation speed cube: Pa2 = Pa1 (n2 / n1)3.
The insulation of the motors coupled to the fans is sufficient to work without restrictions with the frequency converter up to voltages of 500 V. The use of sinusoidal filters at the converter output will contribute to the correct operation of the motor, reducing failures and increasing its useful life. It is advisable that for motors greater than 225 size, these are requested with special windings for operating with a frequency converter.
The length of the output cable from the converter to the fan has an important effect on the voltage characteristics in the motor terminals. The definition 'long cables' will depend on the nominal value and type of converter, and the technical document of the manufacturer must be consulted.
Ex db flameproof motors must be requested for activation with a frequency converter. The motor manufacturer should request information on the application using a questionnaire, to define the working parameters. Furthermore, these motors must have built-in PTC sensors.
Ex eb increased safety motors cannot be activated with a frequency converter (this would require the joint motor-converter certification).
