Product Description:

The 175H8873 is a variable frequency drive produced by Danfoss within the VLT 3000 Variable Speed Drives series. It converts fixed three-phase mains into a controllable output so that induction motors run at commanded speed and torque, improving process precision in conveyors, pumps, and ventilation equipment. By replacing mechanical throttling with electronic frequency control, the unit can reduce wasted energy and smooth out changes in motor speed during normal operation. This approach also lets the driven machine respond more directly to process demand instead of operating only at line frequency. Because motor voltage and frequency are generated electronically, ramp times can be adjusted to reduce mechanical shock during starts and stops.

The power section can draw a maximum apparent power of 12.7 kVA, so the incoming supply must support that electrical demand. Under full load, the line current reaches 29.6 A, which helps determine upstream protection and conductor sizing. Output frequency is adjustable up to 120 Hz, allowing connected motors to run above standard base speed when the application permits it. This supports equipment that needs a wider operating range without changing pulley ratios or other mechanical transmission parts. A line pre-fuse of 50 A protects the input rectifier during short-circuit conditions. At the rated operating point, the inverter delivers 10 HP to the motor. Input and motor terminals accept conductors up to 6 AWG, which simplifies cable selection and helps limit voltage drop in longer cabinet runs.

During continuous duty, the inverter supplies a phase current of 32.0 A, and its thermal design dissipates up to 580 W of heat at maximum load. The control circuitry tolerates line fluctuations of ±10 % without losing regulation, helping the drive maintain stable motor operation on weaker utility feeds. Structural integrity was verified through a vibration test at 0.7 g, which supports panel mounting in machinery that experiences moderate resonance. The unit permits only two power-up cycles per minute to limit component stress. The motor-side connection size matches the input-side capacity, which keeps wiring practices consistent across the power section. Heat released inside the enclosure should also be considered when planning cabinet ventilation.