Product Description:

The 178B0252 is an AC frequency converter manufactured by Danfoss for the VLT 5000 Frequency Converters series. The unit converts fixed-frequency mains power into a variable-frequency output, allowing plant controllers to adjust motor speed according to process demand. This speed control can reduce energy consumption and mechanical stress when equipment does not need to operate continuously at full speed. Typical applications include pumps, fans, and conveyors that require stable torque and accurate speed regulation during continuous industrial operation.

The drive is supplied in a Bookstyle IP20 housing that occupies minimal cabinet width while providing finger-safe access to its terminals. Its input section accepts a 380–500 V three-phase supply, making it suitable for common low-voltage distribution systems in industrial facilities. Continuous power output reaches 1.1 kW at 110% nominal torque for applications with moderate overload requirements. The converter supports up to 0.75 kW at 160% overload for intermittent loads that require a higher short-term torque capability. Electromagnetic emissions are limited by an integrated Class A1 and Class B filter, reducing the need for separate filtering components. A front-mounted display provides local access for entering operating parameters, reviewing drive status, and adjusting motor-control settings. The compact housing format also helps preserve cabinet space for associated protection, control, and power-distribution equipment.

A factory-installed Modbus Plus interface exchanges setpoints, operating commands, and status information with distributed control systems. The internal process control card provides analog and digital signal paths for closed-loop regulation. These connections allow the converter to respond to process feedback such as pressure, flow, temperature, or speed signals without requiring a separate control device for basic regulation. The circuit assemblies use noncoated circuit boards, making the drive most appropriate for clean electrical rooms where moisture and airborne contaminants are controlled. The configuration includes an open option slot that can accommodate a compatible communication or extended I/O module. This arrangement allows the installed interface to handle deterministic network traffic while leaving space for additional control functions. Local display access and network communication can be used independently, allowing operating values to be checked at the cabinet while commands continue to pass through the automation network.