FC-301/302 Danfoss
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The Danfoss FC-301/302 is part of the VLT FC 301 Automation Drives series and features an efficiency class of IE2. It supports an ambient temperature up to 45°C at full current and allows installation at altitudes up to 1000 meters without derating or 3000 meters with derating. The drive offers a starting torque of 160% for 60 seconds and has an output frequency limit of 590 Hz.
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Product Description:
The FC-301/302 is an AC variable frequency drive developed by Danfoss and included in the VLT FC 301 Automation Drives series. Designed for industrial automation, the unit converts fixed-frequency three-phase mains power into variable output voltage and frequency, allowing precise speed and torque regulation of induction motors used in conveyors, pumps, and general process equipment. The drive shares mechanical dimensions, control architecture, and fieldbus options with the wider VLT AutomationDrive FC product group. This compatibility allows the unit to work with supported Danfoss panels and accessories in existing control systems.
During startup, the drive can deliver 160% rated torque for 60 seconds, allowing high-inertia loads to reach operating speed without auxiliary boosters. Continuous operation supports output frequencies up to 590 Hz, while flux mode restricts operation to 300 Hz to maintain motor magnetizing current under vector control. The drive can operate at an ambient temperature of 45 °C while supplying full current. Above this temperature, heat sink limitations require output-current derating. Electrical efficiency follows the IE2 classification, and the displacement power factor exceeds 0.98 at rated load, minimizing reactive power drawn from the supply. The control algorithms respond quickly to load changes, with a flux-mode torque rise time of 1 ms and a VVC+ torque rise time of 10 ms.
During brief demand peaks, the variable-torque profile permits 110% output for 0.5 seconds, allowing fan and pump impellers to clear stalls without requiring an oversized inverter. The true power factor is at least 0.9 at rated load, which helps reduce losses on the incoming power line. The supply phases must remain balanced during operation. If any phase deviates by more than 3.0% of the rated supply voltage, the drive issues a fault and limits its output to protect the connected equipment. Installation at elevations up to 1000 m without thermal derating allows the drive to supply its nominal current within that altitude range. Operation can extend to 3000 m when the output current is reduced proportionally to account for lower air density and decreased cooling performance.
