FC-301P37KT2131H4900 Danfoss
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The Danfoss FC-301P37KT2131H4900 is part of the VLT FC 301 Automation Drives series, featuring a power rating of 37 kW and a continuous output current of 143 Amps. This drive operates with a supply voltage of 200 to 240 VAC three phase, handles up to 50 HP, and supports output frequencies from 0 to 590 Hz. It has a true power factor of at least 0.9 at rated load and features a brake active voltage of 390 V DC.
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Product Description:
The FC-301P37KT2131H4900 is an AC variable frequency drive manufactured by Danfoss within the VLT FC 301 Automation Drives series. The unit converts fixed mains power into a pulse-width-modulated output that allows precise speed and torque control of three-phase induction motors used in conveyors, pumps, and general material-handling equipment. By managing motor flux at frequencies up to 300 Hz, it supports applications that require constant-torque or variable-torque operation while improving energy utilization and reducing mechanical wear.
Its nominal output rating is 37 kW, indicating the continuous power the drive can deliver to a matched motor without derating. This rating corresponds to 50 HP, providing a direct comparison for machinery rated in imperial units. The rectifier and inverter sections are sized for a continuous input current of 130 A, so upstream protection devices must accommodate that current under full load. On the motor side, the inverter can supply 143 A continuously, allowing additional capacity for dynamic torque peaks before current limiting activates. The power section operates with a mains supply of 200–240 VAC, making the drive suitable for low-voltage, three-phase distribution networks common in North American and Japanese plants. Output voltage is adjustable from zero to the full supply level, while the synthesized output frequency can reach 590 Hz when the connected motor permits overspeed operation.
The supply frequency tolerance of 50/60 Hz ±5% allows the converter to operate with common grid frequencies without hardware changes. During operation, an estimated heat loss of 1400 W must be removed through enclosure airflow to maintain acceptable semiconductor temperatures. Shielded motor leads may extend up to 50 m, while unshielded leads may extend up to 75 m without exceeding the drive’s dV/dt limits. The brake chopper engages when the DC bus reaches 390 V. An overvoltage alarm is issued at 410 V DC, prompting the controller to slow the load or use an external braking resistor. The unit permits one power-up per minute, so control sequencing should prevent rapid cycling during operation or fault recovery.
