Product Description:

The 175L3715 is a variable frequency drive produced by Danfoss as part of the VLT 3000 Variable Speed Drives series. The unit converts fixed-frequency three-phase mains power into a regulated output waveform so that induction motors can accelerate, decelerate, and run at the exact speed demanded by pumps, fans, or conveyor cells in automated lines. By varying frequency and voltage simultaneously, it helps cut energy use, trim mechanical stress, and match motor torque to real-time load conditions during continuous industrial service.

The electrical frame of the drive is sized for an apparent input power of 83 kVA, and under full load it operates at an efficiency of 96%, so most of the incoming power is transferred to the motor shaft instead of becoming heat. A maximum input demand of 94.4 A determines feeder cable and breaker sizing, while the converter can deliver a continuous output of 96 A to the motor terminals. With a rated mechanical output of 75 HP, the unit covers mid-range pump or fan duties. Frequency synthesis extends to 120 Hz, allowing motors to run at double their base speed when process throughput needs to be raised.

For intermittent overloads the inverter sources 106 A for up to 60 seconds, giving additional starting torque without resorting to oversized hardware. The recommended supply-side protection is a 150 A pre-fuse, which clears faults without nuisance tripping during normal inrush. Thermal design is split between cooling ribs that dissipate 1074 W and a front section that releases 529 W, figures that guide cabinet ventilation calculations. The aluminum housing carries an IP54 (NEMA 12) rating, so dust and oil-laden air are kept away from control electronics. To limit stress on contactors, the specification permits one switching operation on the input line each minute, a constraint that should be reflected in start-stop sequencing logic.