178B5520 by Danfoss

The 178B5520 is a variable-frequency AC drive produced by Danfoss and placed in the VLT 2800 Low Voltage Drives series. This unit adjusts motor speed on small induction machines to match real-time process demands, which can reduce energy use and mechanical stress in automated lines. It is intended for compact equipment where simple speed control is needed without adding complex motion functions.

The drive accepts a line supply of 200-240 V AC, covering common single-phase and light three-phase networks used around compact equipment. Its inverter section is rated for 0.55 kW, and the mechanical equivalent is 0.75 HP. That output suits small conveyors, fans, and similar utility loads that do not require advanced feedback hardware. A front-mounted built-in display (SLCP) provides parameter access and fault codes without external tools. The unit is rated IP20, so it should be mounted inside a clean cabinet while still allowing finger-safe access to terminals. It uses the standard hardware configuration and has no dedicated application option installed, leaving the application slots open.

Physical layout follows the slim Bookstyle format, which occupies minimal panel width and permits side-by-side stacking in dense control sections. The narrow housing also helps when several drives must fit on one back panel with limited horizontal clearance. To improve circuit board durability, the electronics use a coating finish, which helps protect traces from moisture and airborne chemicals. The drive comes without a fieldbus option, so control signals must be hardwired or handled through analog references. It is also supplied without an EMC filter, so an external RFI filter may be needed where conducted emission limits apply. This configuration suits basic open-loop motor control in compact installations, and communication remains centered on local settings and standard wired signals.