178B0373 by Danfoss

The 178B0373 is a variable-frequency drive manufactured by Danfoss and supplied within the VLT 6000 HVAC Drives series. Designed specifically for commercial and industrial air-conditioning systems, it modulates induction motor speed to match airflow, water flow, or refrigerant compression to the actual load, trimming both electrical demand and mechanical stress. Integrated control, protection, and network functions allow the unit to be installed directly in plant rooms or mounted inside packaged air-handling equipment for closed-loop automation.

Electrical compatibility is supported by the wide input window of 380-460 VAC, allowing the controller to operate on common three-phase utility services without voltage tapping. The drive delivers up to 37/50 kW/HP of mechanical output, making it suitable for medium-sized supply fans or primary chilled-water pumps. A Compact IP 20 housing provides finger-safe protection for indoor panel installation while conserving cabinet space. On-board Profibus DP V1 networking permits high-speed parameter access and alarm reporting to a building management system. An integral LCP (Local Control Panel) supports menu-based setup and local override without external tools.

Electromagnetic compliance is aided by the integrated Class A1 and B filter, which suppresses conducted emissions so multiple drives can share a single feeder. The unit is intended for HVAC applications and is supplied as a standard unit, making it suitable for variable-torque loads such as fans and pumps. Environmental protection follows the designation No coating, indicating that the circuit boards are not conformally coated and are intended for climate-controlled electrical rooms rather than corrosive washdown areas. This operating profile suits indoor mechanical systems where stable speed control is needed for air handlers, circulation pumps, and similar building equipment.