Product Description:

The 178B3435 is an AC variable-frequency drive produced by Danfoss within the VLT 6000 HVAC Drives series. This product modulates the speed of three-phase induction motors used in air-handling units, pumps, and chillers, allowing building automation systems to match motor output to real-time airflow or water-flow demand. By integrating power electronics, control logic, and a keypad in one enclosure, the drive simplifies installation in mechanical rooms and electrical panels while providing centralized access to essential operating functions.

The power stage accepts a mains supply of 380–460 VAC, covering the typical voltage range found in commercial facilities. Its housing is a Compact NEMA 1 enclosure, so the unit can be panel-mounted indoors while maintaining basic protection against dust and incidental contact. An onboard LCP provides local start, stop, and parameter access without requiring external programming hardware. Communication expansion slots are present, but the drive is shipped with no installed fieldbus option, allowing a suitable protocol to be added only when the application requires one. The control boards have no conformal coating; therefore, the drive should be installed in an area free from corrosive airborne contaminants that could damage exposed electronic components or shorten their service life.

The unit has no integrated filter, so any required radio-frequency interference suppression must be provided by an external line filter to meet site electromagnetic compatibility requirements. Its mechanical configuration uses the standard unit layout, with mounting holes and terminal locations arranged for the corresponding power frame. The product has an HVAC drive classification, indicating that its control functions, cooling characteristics, and parameter selections are intended for variable-torque fan and pump loads rather than constant-torque machinery. Available operating functions include automatic adjustment of airflow setpoints and reduced-speed nighttime operation, which can lower energy use while maintaining the required building conditions. Proper installation should provide suitable panel clearances, ventilation, and protection from moisture or chemical vapors so the drive can regulate connected motors without exposing its internal electronics to damaging conditions.