Product Description:

The 131L9868 is an AC variable frequency drive manufactured by Danfoss for the VLT FC 101 HVAC Basic Drives series. It regulates the speed of induction motors used in ventilation, pumping, and compressor systems, allowing connected equipment to respond to changing load demands in building automation applications. The drive accepts commands from external controllers and is supplied with no local control panel, making it suitable for panel-mounted installations where operation is managed from a central control system. This arrangement also reduces the number of operator components required on the front of the electrical enclosure.

The input section accepts a 380–480 VAC three-phase supply and includes phase monitoring that prevents operation under single-phase conditions. The inverter provides a continuous mechanical output of 7.5 kW, supporting medium-sized fans, pumps, and compressors that require variable-speed operation. Its IP20 chassis enclosure protects against accidental contact with internal electrical parts but requires installation inside a suitable cabinet where dust or moisture may be present. The drive has no internal brake chopper, so applications requiring rapid motor deceleration must use an external braking module. Control settings can be adjusted to match acceleration times, motor characteristics, and process demands without changing the main power hardware.

The factory-installed filter meets RFI class A1 (C2), helping reduce conducted electromagnetic emissions on the incoming power lines. The drive uses coated printed circuit boards to protect its control electronics from humidity and airborne contaminants commonly encountered in mechanical rooms and HVAC installations. Power and control conductors pass through standard cable entries, providing straightforward routing within an electrical enclosure. The input and output terminals are arranged for separate mains, motor, and control connections, which helps maintain appropriate separation between power conductors and low-voltage signal wiring. An external controller can provide speed references, start and stop commands, and process feedback through the available control connections. Cabinet airflow must provide sufficient heat removal around the chassis so the inverter can operate reliably under continuous load.