Product Description:

The 178F1685 frequency converter is produced by Danfoss for the VLT 5000 Frequency Converters series. As a drive module, it converts three-phase mains power into a variable-frequency output so plant controllers can match motor speed to the load in pumping, conveying, and ventilation applications. The converter fits directly on a wall or machine frame, providing a compact installation while maintaining the electrical performance associated with the VLT 5000 product line. Its variable-speed operation can also reduce unnecessary motor output when process demand falls below the maximum operating level.

The converter accepts a nominal input from a 380–500 V three-phase supply, making it suitable for standard industrial power networks without step-up or step-down transformers. When a process requires a brief overload, the drive delivers 90 kW at 110% torque. It sustains 75 kW when the duty cycle requires 160% torque for acceleration or impact loads. A compact IP54 enclosure protects the internal electronics from dust and water spray, allowing the unit to be mounted outside a cabinet. Serial communication over DeviceNet provides parameter access and status messaging through common PLC gateways, reducing discrete wiring and supporting centralized diagnostics.

Application-level regulation is handled by the process control card, which supports PID loops and analog scaling for independent flow or pressure control. A factory-installed supplied display shows real-time current, voltage, and fault codes without requiring an external keypad. The power section uses uncoated circuit boards, leaving the electronic components free of conformal coating. The unit has standard base electronics shared across the VLT 5000 platform. This common electronic architecture supports consistent control behavior across multiple power sizes while retaining the operating features required for industrial motor control.