Product Description:

The 131F3968 is an AC variable frequency drive produced by Danfoss for the VLT FC 202 AQUA Drives series. This controller regulates the speed of centrifugal pumps, blowers, and similar equipment used in water processing and other industrial automation applications. It controls motor speed by modulating the frequency and voltage supplied to an induction motor, allowing the connected equipment to operate across a variable speed range.

It delivers a continuous output of 5.5 kW, which corresponds to 7.5 HP when expressed in imperial units. The power section accepts 380–480 VAC from utility feeds, and the rectifier and inverter stages are arranged for three-phase power, allowing the unit to connect directly to common plant distribution panels. An IP20 chassis enclosure permits installation inside ventilated switchgear without additional sealing while protecting the electronics against accidental contact. Thermal derating tables assume cabinet mounting, so adequate airflow must be maintained around the heat sink. These electrical and enclosure characteristics support installation in control cabinets serving pumps, blowers, and related motor-driven equipment.

A built-in RFI Class A1/B (C1) filter limits conducted emissions to help facilities meet electromagnetic compatibility requirements. Operator interaction is provided by the graphical local control panel, which shows parameters and alarms on a backlit display. Reliability in humid pump rooms is improved by the coated circuit boards, which help protect the control electronics against moisture and airborne contaminants. For applications that do not require kinetic energy dissipation, the design includes no brake chopper. Cable routing is straightforward because the drive is supplied with standard cable entries that require no adaptation. The A, B, C0, C1, and D option slots are empty, and the unit has no dedicated mains option.