134F2973 by Danfoss

The 134F2973 is an AC variable frequency drive manufactured by Danfoss as part of the VLT FC 360 Automation Drives series. This chassis unit is intended to regulate the speed of three-phase induction motors used in conveyors, mixers, and pump systems across automated factories. By converting fixed line power into a variable voltage and frequency output, the drive lets the system adjust motor torque, limit inrush current, and improve energy efficiency in continuous-duty industrial processes. It is suitable for applications that need repeatable motor control during process changes and routine start-stop cycles.

The drive accepts a line supply of 380-480 VAC three-phase, allowing installation on common low-voltage distribution networks. Its power section is rated for 1.1 kW, which corresponds to a mechanical shaft capacity of 1.5 HP when coupled to a standard motor. This rating suits compact industrial equipment where controlled starts and steady running are required. The unit is engineered for high-overload duty, meaning it can deliver 150% current for short intervals without derating. A built-in brake chopper is provided so excess regenerative energy can be dissipated through an external resistor during rapid deceleration events, preventing DC-bus overvoltage and maintaining control stability.

The drive uses an IP20 chassis enclosure, which allows cabinet mounting while guarding the power terminals from accidental contact. For multi-drive installations, the integrated load-sharing option equalizes DC-bus energy between inverters, reducing the number of braking resistors required. Conducted emissions are limited to RFI Class A2, enabling compliance with industrial EMC limits when the prescribed cable entries and grounding practices are followed. The power boards use a coated PCB finish that resists dust and humidity during operation. This added surface protection helps reduce the effects of contamination during long operating periods.