FC-103 Danfoss
Wake Industrial LLC is not an authorized distributor of this product.
The Danfoss FC-103 is a drive from the VLT FC 103 Refrigeration Drives series. It features 2 analog inputs, 6 digital inputs with a maximum voltage of 28 V DC, and a maximum output frequency of 590 Hz. The drive operates with a supply frequency of 50/60 Hz and has a maximum ambient temperature rating of 55 °C.
Internal Product Review
The FC-103 is a Danfoss VLT refrigeration drive engineered for dependable cooling system control, with a 590 Hz maximum output frequency and a 5 ms scan interval. From a controls standpoint, the >0.98 displacement power factor and 0.5% FS analog input error support efficient operation and steady signal handling. IP66 protection and 55 °C ambient capability make the FC-103 a strong choice for demanding refrigeration installations.
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Product Description:
The FC-103 is an AC variable-frequency drive manufactured by Danfoss for the VLT FC 103 Refrigeration Drives series. In refrigeration and cold-room installations, the unit modulates induction motor speed so compressors, condensers, and fans can respond to the thermal load instead of running continuously at a constant frequency. This closed-loop speed control lowers energy consumption and reduces mechanical cycling in temperature-critical storage and processing applications. The drive can regulate connected equipment in response to pressure, temperature, or other process signals supplied through its control interface.
The control interface contains 2 analog inputs, each with an accuracy of 0.5% FS, allowing pressure or temperature transmitters to provide precise speed references. The drive receives six discrete commands through 6 digital inputs rated for 28 V DC, while a transistor output can sink up to 40 mA to signal operating status to a PLC. The output frequency can reach 590 Hz when high compressor speed is required. Acceleration can be extended to a maximum ramp time of 3600 s to reduce mechanical stress on belt-driven equipment. The internal control loop samples field variables at 5 ms intervals and operates with input supplies at 50 or 60 Hz, supporting consistent control in different power systems.
Electrical efficiency is supported by a displacement power factor above 0.98 and a true power factor of at least 0.9, which reduce reactive current drawn from the feeder. The enclosure has an IP66 rating, so washdown or splash exposure will not compromise operation, while a Class 3C2 conformal coating provides additional protection against airborne salt or ammonia. Continuous operation is permitted at ambient temperatures up to 55 °C and at relative humidity levels as high as 95%, accommodating conditions common in compressor rooms. Networked drives communicate over RS-485 at 115 kBaud, supporting multidrop connections without additional gateways. The communication link allows operating commands, process values, and drive status information to be exchanged with a compatible supervisory controller.
