175L3718

Product Description:

The 175L3718 is an AC variable frequency drive produced by Danfoss as part of the VLT 3000 Variable Speed Drives series. Acting as a closed-loop power converter, it regulates the speed of three-phase induction motors used on conveyors, pumps, and other automated equipment. By modulating both voltage and frequency, the unit matches motor torque to process demand, improving energy use and reducing mechanical stress while fitting into NEMA 1 control cabinets that bridge mains power and driven machinery.

For power sizing, the drive handles a maximum apparent power of 116 kVA and accepts a peak mains input of 167.2 A; a rated output current of 168 A sustains continuous duty for motors up to 125 HP. Its output section can generate frequencies up to 120 Hz, enabling oversynchronous motor operation when required. Line protection is coordinated with a pre-fuse limit of 250 A, and acceleration or deceleration events can be stretched to a programmable ceiling of 3600 s to soften mechanical loading. The electronics tolerate line variations within ±10 % and keep full-load performance at ambient temperatures up to +40 °C.

Thermal and installation aspects complete the performance profile. With a full-load efficiency of 0.96, the converter dissipates only 910 W of heat. It can supply an overload current of 185 A for sixty seconds without protective trips, while the output terminals accept conductors up to 500 kcmil to limit wiring losses. Unshielded motor leads may extend 1000 ft, and vibration resilience is verified to 0.7 g. The unit weighs 464 lb in its NEMA 1 enclosure, and the combination of long motor-cable reach, controlled ramping, and low power loss supports smooth torque delivery during frequent start-stop cycles.