Product Description:

The FC-202P18KT2131B9535 is a variable frequency drive manufactured by Danfoss for the VLT FC 202 AQUA Drives series. It is engineered to modulate the speed of three-phase induction motors that run pumps or blowers in industrial water treatment, irrigation, and similar fluid-handling systems. By synthesizing a controllable output waveform, the drive allows plant logic to maintain constant pressure or flow without throttling valves, thereby reducing energy use and mechanical stress during continuous-duty service.

The input stage accepts mains voltages between 200–240 VAC, and at full load, the converter draws 54.0 A of continuous current. Insulated-gate transistors switch this energy into a maximum mechanical output of 18.5 kW, equivalent to 25 HP when coupled to a typical four-pole motor. The output frequency can be set anywhere from 0–590 Hz, so pressure pumps can idle gently during low demand or accelerate above base speed for backflushing cycles. Three-phase output is produced at a voltage that tracks the incoming line within the permitted range, protecting motors from overexcitation while maintaining torque across the adjustable range.

During operation, the inverter achieves an efficiency of 0.96, reducing heat generation in crowded pump rooms. Its sinusoidal pulse-width modulation can regulate motor voltage from 0–100% of the supply voltage, allowing soft-start routines to bring systems to pressure without hydraulic shock. Acceleration and deceleration are governed by a programmable ramp time of 1–3600 seconds, so speed changes can be matched to the pipework mass to help avoid water hammer. The drive can operate at ambient temperatures up to 50 °C, and its altitude capability extends to 3000 m with derating, supporting operation in elevated treatment plants. Shielded motor leads may extend up to 150 m, while unshielded leads may extend up to 300 m. A 125 A prefuse and a three-phase 50/60 Hz input support integration with standard low-voltage switchgear.