Product Description:

The 178B3306 variable-frequency drive is supplied by Danfoss as part of the VLT 6000 HVAC Drives series. Designed for supply fans, exhaust fans, chilled-water pumps, and other air-handling equipment, the drive converts fixed three-phase mains power into a modulated output that allows building control systems to vary motor speed. Adjusting motor speed helps regulate airflow, water circulation, temperature, and pressure without relying solely on dampers or control valves. This operating method can reduce unnecessary energy consumption when the connected equipment runs below its maximum capacity.

This unit accepts a 380–460 VAC input, allowing direct connection to common industrial power systems without an external transformer. Its compact IP54 housing protects the internal electronics from dust and splashing water, making wall mounting outside a dedicated cabinet possible in suitable indoor locations. Parameters are entered through the integrated LCP (Local Control Panel), which provides menu navigation, fault information, and manual start and stop controls. Conducted emissions are reduced by a factory-installed Class A1 filter, supporting installations that must comply with applicable electromagnetic compatibility requirements. Hardwired analog and digital connections allow the drive to receive speed references, operating commands, and status signals from an external building control system.

The printed circuit boards have no protective coating, so the sealed enclosure provides the primary barrier against airborne dust and occasional moisture. The controller uses the standard unit configuration, which follows the base hardware arrangement for this model. Its control functions are intended for variable-torque applications such as centrifugal fans and pumps, where torque demand generally decreases as motor speed is reduced. The drive has no fieldbus option, so external control relies on hardwired inputs, outputs, and analog reference signals instead of a network communication protocol. Local access through the control panel permits direct parameter changes and operating checks at the installed drive. The enclosure should remain properly closed during operation to preserve its protection against dust and water splashes.