131B1874 by Danfoss

The 131B1874 variable frequency drive is produced by Danfoss for the VLT FC 302 Automation Drives series. It regulates the speed of three-phase induction motors used in conveyors, pumps, and fans, which helps improve process accuracy and reduce unnecessary energy use. By adjusting output frequency and voltage, the unit matches motor speed to process demand instead of forcing full-speed operation at all times. This method is useful in systems that do not need fixed-speed motor operation across the entire duty cycle.

The drive is supplied in frame size B2 with standard cable entries that help simplify cabinet layout. Its enclosure measures 664 mm in height, 243 mm in width, and 261 mm in depth, and it carries an IP54/Type 12 N3R rating that helps prevent dust ingress and withstand water splashes. The power stage accepts a three-phase input of 380-500 VAC and delivers up to 22 kW, which is equivalent to 30 HP for medium-duty motor loads. No A, B, C, D, brake chopper, or mains options are fitted, so the hardware remains in a base configuration. The drive uses an uncoated PCB and includes a standard language pack for local setup. These features keep installation straightforward in cabinets that already provide the required control and braking accessories.

Operator interaction occurs through the graphical Local Control Panel, which provides direct access to status information and parameter changes at the drive. The integrated RFI Class A1/B (C1) filter helps limit conducted emissions on factory mains. Continuous operation dissipates 739 W of heat, and the apparent power capability reaches 30.5 kVA during short load peaks. The unit is identified as Series 302, and mechanical braking and fieldbus expansion are handled by external devices. Panel ventilation still needs to account for the drive's heat output during sustained operation.