FC301-302 Danfoss
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The Danfoss FC301-302 is part of the VLT FC 301 Automation Drives series and is classified as IE2 for energy efficiency. It supports analog input with a resolution of 10 bits and a bandwidth of 100 Hz, and operates with a supply frequency of 50 or 60 Hz. The drive has a displacement power factor greater than 0.98 and can maintain full performance at altitudes up to 1000 meters without derating.
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Product Description:
The FC301-302 variable frequency drive is produced by Danfoss as part of the VLT FC 301 Automation Drives series in the VLT AutomationDrive FC product group. Intended for cabinet mounting, the unit modulates three-phase supply voltage so plant PLCs can adjust motor speed rather than relying on mechanical throttling. By maintaining precise electrical control, the drive reduces energy consumption and provides consistent torque for conveyors, centrifugal pumps, and other industrial motion axes. It supports standard induction and permanent-magnet motors and fits applications where compact dimensions and integrated I/O are desirable.
The analog reference channel passes signals up to 100 Hz, so speed or torque commands are accepted without noticeable attenuation. Input resolution is 10-bit, providing 1,024 discrete steps for fine setpoint control. For sensors or potentiometers, the drive supplies a stable reference of 10.5 V ±0.5 V, and the terminal strip delivers a regulated 24 V supply with a tolerance of +1/-3 V for external transducers. Logic outputs can switch 40 mA, which is sufficient for relays or optocouplers, while a displacement power factor above 0.98 keeps line current almost in phase with voltage. Compliance with the IE2 efficiency class limits conversion losses, and operation on utility grids at 50/60 Hz with a tolerance of ±5% supports use with common industrial power systems. The inverter tolerates a phase imbalance of up to 3% of the rated supply voltage before derating.
Continuous full-power operation is available at altitudes up to 1000 m, with proportional current reduction permitted at elevations up to 3000 m. The power section is designed for Category III overvoltage installations, so it withstands transient spikes commonly encountered in industrial switchboards. Safe Torque Off terminals draw 60 mA rms at 20 V or 50 mA rms at 24 V, enabling SIL-rated contactors to disable the inverter without extra relays. A true power factor of at least 0.9 under nominal conditions supports energy audits. Onboard thermal models automatically scale the output when ambient temperature or supply conditions approach protective thresholds.
