Product Description:

The 178B2009 variable-frequency drive is produced by Danfoss within the VLT 6000 HVAC Drives series. It is an AC converter engineered for heating, ventilation, and air-conditioning machinery, where speed control of induction motors reduces energy consumption and noise in air handlers, pumps, and cooling towers. By modulating the output frequency applied to the motor, the unit allows building automation systems to match airflow or water flow to real-time demand, improving overall process efficiency and extending mechanical service life.

It accepts a three-phase input of 380–460 V AC, enabling direct connection to common industrial power supplies without step-down transformers. The inverter can deliver 5.5 kW or 7.5 HP at the motor terminals, providing suitable output for medium-sized fan wheels and circulation pumps in commercial buildings. A slim book-style IP20 enclosure allows dense installation in electrical closets while still providing finger-safe protection when mounted in a cabinet. To limit conducted emissions, the drive is fitted with Class A1 and Class B filters, supporting electromagnetic compatibility in domestic and industrial areas. Operation is normally supervised from a central controller because the drive is supplied without a local control panel, making remote parameter setting the primary approach.

For air-handling installations, the drive is designed for HVAC duty, so its internal algorithms prioritize ramp profiles that protect duct pressure sensors and valve actuators from abrupt operating changes. The electronics use a standard configuration, with the baseline power and thermal components intended for this series. The drive has no fieldbus options, so integration relies on analog signals or discrete input and output connections provided by the building management controller. The circuit boards have no conformal coating, so the assembly should be installed in conditioned switchgear rooms where humidity remains controlled. Appropriate cabinet ventilation and protection from condensation help preserve dependable operation without adding unsupported environmental claims.