Product Description:

The 134U2978 is an AC variable-frequency drive manufactured by Danfoss for the VLT FC 280 Midi Drives series. The unit converts fixed-frequency three-phase mains power into a variable output that allows equipment such as conveyors, pumps, and small fans to match motor speed to process demand. Its compact design provides effective speed regulation when the inverter is installed inside a control cabinet.

The drive has a continuous output rating of 0.55 kW, which corresponds to 0.75 HP and supports fractional-horsepower applications that require precise torque control. The power section accepts a three-phase 380–480 VAC supply. No additional line chokes or fuses are factory-installed, so any required upstream protection must be selected as part of the surrounding electrical system. The chassis-mount frame has an IP20 chassis protection rating, which helps prevent accidental contact with live parts after the drive is installed behind a panel door. Conducted and radiated emissions are limited by an integrated RFI network rated for EMC Category C1 at 200 V and C2 at 400 V, helping control cabinets meet common industrial electromagnetic compatibility limits without an additional filter.

Dynamic stopping is managed by an internal brake chopper that routes regenerated energy to an external resistor rather than returning it to the electrical grid. The circuit boards have a coated PCB finish that protects copper traces and electronic components from moisture and airborne contaminants commonly found in plant environments. A standard control card with Modbus provides fieldbus connectivity, allowing a PLC to access operating commands, status information, and diagnostic registers directly. The front face has no integrated display, so configuration and local interaction are performed through the communication bus or a detachable programming device. Both adaptation settings remain in their standard configuration, allowing the drive to operate without application-specific modifications.