178B0232 by Danfoss

The 178B0232 is an AC variable-frequency drive produced by Danfoss and assigned to the VLT 6000 HVAC Drives series. Intended for ventilation and pumping duties, the unit converts fixed mains power into a modulated output that matches changing air-handling demand inside commercial facilities. By adjusting motor speed rather than relying on dampers or valves, the product reduces energy use, lowers mechanical stress, and provides tighter temperature and pressure control within automated building management systems.

This drive accepts a three-phase supply of 380-460 VAC, allowing installation on common industrial power networks without an autotransformer. Its output capacity of 1.1 kW/1.5 HP makes it suitable for small supply fans or secondary pumps that require speed regulation but limited shaft power. A built-in communications port supports Profibus DP V1, so supervisory PLCs can issue start, stop, and setpoint commands while also retrieving feedback such as fault codes and operating hours. The drive has a compact Bookstyle IP20 enclosure designed for side-by-side mounting in low-depth control panels, and the IP20 rating means touch-safe live parts when it is installed in a clean electrical room. Conducted emissions are attenuated by the factory-installed Class A1 and B RFI filter, helping the panel meet EMC limits in both industrial and light-industrial zones. Parameter entry is performed on the removable front-mounted LCP, which provides a two-line display and navigation keys for local setup.

The dedicated HVAC control functions include PID loops and sleep functions that reduce run time when sensor feedback indicates that the load has been satisfied. Because the hardware is a standard unit, it has no special heat-sink extensions or coated boards. The printed circuit boards have no coating, so the drive is best suited to clean, conditioned electrical rooms where airborne contaminants are limited. This arrangement fits typical indoor fan and pump panels that do not require added protection against harsh contaminants.