Product Description:

The FC-202N250T7134G6276 is an AC variable frequency drive produced by Danfoss for the VLT FC 202 AQUA Drives series. This model converts fixed-frequency line power into a modulated output that controls the speed of centrifugal pumps and blowers used in water and wastewater treatment. Adjusting motor speed instead of mechanically throttling flow can reduce energy consumption and help maintain stable pressure. The drive is intended for high-power pumping systems in municipal facilities and large industrial processes, including filtration, aeration, and water distribution equipment.

The drive supports up to 350 hp of motor output, while its electrical output is rated at 250 kW. These ratings accommodate large pumps and blowers that require substantial power during continuous operation. The inverter accepts line voltage up to 690 V and operates at voltages as low as 525 V, making it suitable for 600 V class power networks used in heavy infrastructure. It is designed for three-phase power, which provides balanced current across the incoming conductors. Variable-frequency output allows connected motors to respond to changing flow or pressure demands without relying solely on valves, dampers, or other mechanical controls.

The drive includes an integrated brake chopper designed for use with an external braking resistor. A minimum resistance of 3.4 Ω prevents excessive braking current during rapid deceleration. A nominal resistance of 4.0 Ω is suitable for typical controlled stopping cycles. For applications with lighter braking demands, the recommended resistance is 4.6 Ω, which reduces peak current through the braking circuit. The resistor must be selected with an appropriate power rating for the load, stopping frequency, and amount of regenerated energy. This braking arrangement allows the drive to manage energy returned by the motor when pump or blower inertia causes the shaft to continue rotating during a commanded slowdown.