Product Description:

The 131U0931 is an AC variable frequency drive manufactured by Danfoss for the VLT FC 102 HVAC Drives series. The device converts a fixed-frequency, three-phase supply into a modulated output that allows building-management controllers to adjust motor speed in ventilation, pumping, and chiller circuits. By matching motor speed to the actual load, the drive helps maintain airflow, pressure, or temperature while reducing the energy consumed by auxiliary equipment in industrial and commercial facilities. Its control capabilities make it suitable for HVAC systems that require variable motor output throughout changing operating cycles.

Input compatibility ranges from 380–480 VAC, covering common low-voltage distribution networks found in mechanical rooms. The power section uses three-phase power, so it connects directly to a compatible three-phase supply without phase conversion. An integrated EMC network rated as RFI Class A1/B (C1) limits conducted emissions on the mains line and supports operation where sensitive instrumentation shares the same electrical supply. Local setup is handled through the front-mounted graphical local control panel, which provides access to parameters, trend views, operating data, and manual start and stop controls without requiring an external interface. The control boards use an uncoated PCB design, so the enclosure must protect the electronics from excessive humidity, condensation, and airborne contaminants. This board design is appropriate for clean, controlled cabinets that remain within the permitted operating conditions.

The factory configuration includes no additional I/O or relay card, leaving control expansion to separately installed equipment when an application requires more signals. It also includes no harmonic mitigation accessories, so any external filtering can be selected according to the electrical conditions and power-quality requirements at the installation site. The standard application configuration does not add custom control functions, keeping the supplied HVAC parameter structure unchanged. Blank positions for the B, C0, D, and mains options indicate that related add-on functions are not installed in this configuration. The available internal space can accommodate compatible accessories if operating requirements change after the initial installation.