131B9975 by Danfoss

The 131B9975 is an AC micro drive manufactured by Danfoss within the FCD 300 Micro Drives series. Intended for processing applications, the unit serves as a field-mounted speed controller that removes the need for cabinet-housed inverters and allows direct installation near pumps, conveyors, and agitators on automated lines. It converts fixed mains frequency into adjustable output suitable for standard three-phase induction motors, allowing motor speed to track process demand more closely than line-frequency operation.

Electrical capability centers on a rated output of 11.0 kW. The power stage accepts three-phase input from 380 V AC to 480 V AC, letting the same model operate on common low-voltage industrial networks. An enclosure rating of IP21 indicates protection against vertically falling water drops and accidental finger contact, so the drive is intended for dry indoor locations. Conducted emissions are limited by compliance with RFI category H1, helping the installation meet EMC requirements in commercial environments. The design omits a local control panel and a protective circuit-board coating, so command and monitoring functions are handled through external control hardware. The internal model code CD-302P11KT4P21H1 identifies this configuration.

Mechanical format follows frame designation B1, which sets the bolt pattern and conduit entry positions for this family. Height is 480 mm and width is 242 mm, giving the drive a compact rectangular form that can be fastened directly to support structures without extra brackets. The assembled mass of 21.72 kg adds thermal inertia that helps moderate heat rise while still remaining practical to handle during installation. Combined with the 260 mm depth, these proportions leave room for airflow around the heat sinks and help the unit fit beside motor disconnects and filters. This layout also supports predictable cable routing for power and motor connections.