178B5028 by Danfoss

The 178B5028 is an AC variable-frequency drive built by Danfoss for the VLT 2800 Low Voltage Drives series. As a low-power controller, it varies motor speed so pumps, conveyors, or fans in process installations can match real-time load requirements instead of running at constant frequency. This function helps reduce energy consumption and mechanical stress in automated production lines. It is intended for applications where motor speed needs to follow process demand rather than fixed line frequency during changing load conditions.

The drive delivers a continuous mechanical output of 2.2 kW, equivalent to 3.0 HP, and it accepts line supplies from 380-480 V ±10% at 50/60 Hz. Internally, it is wired for three-phase operation, allowing balanced current draw from industrial mains. A compact book-style chassis lets several units mount side by side in shallow panels, preserving cabinet space in crowded control rooms. Electronic boards use a coating finish so airborne moisture or dust has less impact on long-term reliability. This output level is suited to small industrial motors used on utility loads and light material-handling equipment.

The enclosure carries an IP20 rating, so the drive is intended for clean indoor panels. A front-mounted built-in display (SLCP) shows frequency, current, and alarm codes, removing the need for an external keypad during normal operation. The dedicated application class is Process, which suits moderate acceleration ramps and constant-torque profiles used in mixers, agitators, or dosing pumps. The standard configuration has no application option and no fieldbus card, so speed commands are provided through discrete or analog signals. This arrangement supports basic standalone control where network integration is not required. An internal relay reports run and fault status, and the missing RFI filter may require external EMC measures where conducted emissions are limited.