Product Description:

The FC-202N315T7135N4882 is a variable-frequency drive manufactured by Danfoss for the VLT FC 202 AQUA Drives series. It modulates power to large pump or fan motors used in water and wastewater automation, providing speed regulation that matches changing process demand. This control method reduces unnecessary motor operation while supporting stable flow, pressure, or ventilation performance in demanding industrial systems.

The drive accepts a three-phase input of 525–690 V AC and supports motors rated up to 315 kW, which corresponds to 425 hp. An internal thermal relay rated at 90 A trips the inverter if output current exceeds safe thermal limits. The power section can switch at up to 32 kHz, allowing fine voltage steps that reduce acoustic noise in high-speed induction motors. The control terminals provide one analog output with a range of 0/4–20 mA, allowing torque, speed, or another assigned parameter to be reported to an external PLC analog input. This analog channel can drive loads with a resistance as low as 500 Ω without recalibration. Digital inputs withstand up to 28 V DC, while the single open-collector transistor output can handle up to 40 mA for alarms, drive-ready indications, or other status signals.

Dynamic stopping energy is dissipated by a 3.2 kW brake resistor connected with 50 mm² (1/0 AWG) cable. The braking network requires a minimum resistance of 2.3 Ω and has a nominal design value of 3.7 Ω. For lighter deceleration duty, the resistance can be adjusted toward the manufacturer’s recommended value of 26 Ω. This arrangement converts regenerative energy into heat during rapid pump shutdowns instead of allowing excess energy to remain on the DC bus. Proper resistance and cable sizing help the braking circuit manage thermal loading during repeated stopping cycles without interfering with the drive’s control connections.