Product Description:

The 178B1185 is a variable frequency drive produced by Danfoss for the VLT 6000 HVAC Drives series. It regulates fan and pump motors in building services by adjusting motor speed to match the thermal load. This speed control can reduce unnecessary energy consumption when the connected equipment does not need to operate at full capacity. The drive is designed for heating, ventilation, and air-conditioning systems, including air handlers, circulation pumps, and chilled-water equipment.

The drive operates from a three-phase input range of 380–460 VAC, which is compatible with common industrial power systems. It supports an output rating of 18.5 kW / 25 HP for connection to mid-sized induction motors. The circuitry is housed in a compact IP20 enclosure intended for installation inside a ventilated control cabinet. Conducted emissions are attenuated by an integrated Class A1 and B filter, reducing the need for separate electromagnetic interference filtering in many commercial installations. The control boards have a protective coating that helps guard electronic components against condensation, humidity, and airborne contaminants in mechanical rooms. Adequate cabinet ventilation must be maintained so heat from the power electronics can dissipate during continuous operation.

Operator access is provided through a detachable local control panel (LCP) that supports parameter adjustment, operating-status checks, and fault-code viewing without an external computer. The power stack and control platform use the standard unit architecture available for this drive series. Acceleration and deceleration behavior is suited to duct and pipe systems, where abrupt speed changes can cause pressure disturbances or unnecessary mechanical stress. The base configuration does not include factory-installed application modules or fieldbus boards, leaving the associated interfaces available for separately selected accessories. Motor data, operating limits, and control parameters can be entered through the panel to match the drive to the connected fan or pump. Its cabinet-mounted format keeps the electronic components protected while allowing access to terminals and controls during installation and routine system checks.