Product Description:

The 134L1981 is an AC variable frequency drive produced by Danfoss for the VLT FC 202 AQUA Drives series. It modulates the speed of centrifugal pumps, blowers, and similar induction motors so that flow or pressure can be matched to real-time demand in water and wastewater installations. By converting fixed-frequency input power into a controlled output waveform, the drive allows automation systems to reduce energy consumption, lower mechanical stress on pipelines, and maintain stable process variables without throttling valves or bypass loops.

This model supplies up to 3.0 HP of mechanical output, while its continuous electrical power limit is 2.2 kW. The input section accepts 200–240 VAC, a range that covers common low-voltage utility supplies in decentralized pump rooms. The drive accepts single-phase power, simplifying installation where only two live conductors and a protective ground are available. Conducted emission control is provided by an integrated RFI Class A1/B (C1) filter, which attenuates high-frequency noise so the drive can share panels with sensitive instrumentation. Standard cable entries are supplied under Adaptation A, and no additional power or option modules are fitted, keeping enclosure depth and wiring straightforward.

Durability is enhanced by an enclosure rated at IP55 / Type 12, preventing dust ingress and resisting low-pressure water jets in equipment rooms that may be washed down. All circuit boards have a coated PCB finish, protecting conductive paths from condensation and aggressive vapors typical of chlorine or ozone treatment areas. Local interaction is handled through the Graphical Local Control Panel, which presents parameters and trend data on a backlit display for on-site operation. The panel provides direct access to operating information and drive settings without requiring a separate display device. For stop-category applications, the unit has no brake chopper, so kinetic energy is instead dissipated through the motor and load.