178B8585 by Danfoss

The 178B8585 is a variable-frequency AC drive manufactured by Danfoss for the VLT 2800 Low Voltage Drives series. It is used in process automation lines to regulate the speed of induction motors on pumps, fans, and conveyors. By converting fixed mains power into a variable output frequency, the drive adjusts motor speed to match process demand and supports stable operation across common three-phase equipment. This type of control can reduce abrupt starts and help the connected motor run more consistently as load conditions change.

The electrical section is rated for a continuous output of 7.5 kW, which is equivalent to 10 HP on standard four-pole motors. It accepts an input of 380-480 V ±10 % 50/60 Hz on a three-phase network, allowing connection to standard low-voltage supplies. A built-in brake circuit supports controlled deceleration of process loads and helps manage stopping behavior on systems with changing inertia. The drive has an IP20 enclosure rating, so it is intended for installation inside a ventilated cabinet rather than in an exposed machine location. Because no RFI filter is installed, EMC compliance may require an external line filter.

Mechanical integration uses a Bookstyle housing, which helps the unit fit neatly on DIN rail or back-plate assemblies alongside other VLT modules. All circuit boards have a protective coating that improves resistance to conductive dust and humidity inside the enclosure. A built-in SLCP display shows speed, current, and fault codes during operation, which simplifies local status checks and parameter review at the drive. Communication terminals remain inactive because the unit is supplied without a fieldbus option, and external gateways can be added when network integration is needed. No additional application option is loaded, so the available parameter space remains open for application-specific settings.