175H1152
by Danfoss
The 175H1152 variable frequency drive is produced by Danfoss as part of the VLT 3000 Variable Speed Drives series. The unit converts fixed-frequency three-phase mains into a controlled output for induction motors in conveyor, pump, and fan applications found throughout industrial automation. By adjusting the delivered frequency and voltage it allows precise motor speed regulation.
Designed for European three-phase networks, the drive accepts a line voltage of 3 x 380/400/415 V (±10%) at a 50/60 Hz supply frequency. Under constant-torque duty it delivers a continuous output current of 10.0 A and apparent power of 7.2 kVA, while variable-torque loads can be supplied with 13.0 A and 9.3 kVA. Internal power conversion reaches an efficiency of 0.96 at full load, minimizing heat dissipation and cabinet ventilation demand. The inverter synthesizes output frequencies up to 500 Hz, so high-speed motors can be driven without mechanical gear multiplication. To protect switching elements the manufacturer restricts input contactor operations to 2 per minute, preventing inrush-related stress.
For mechanical integration the unit supports motor leads up to 300 m, allowing remote mounting of pumps or fan decks without additional filters when standard screened cable is used. Circuit protection upstream of the drive calls for a 25 A pre-fuse to clear faults within the permitted energy let-through. Typical shaft power ratings reach 4.0 kW in constant-torque service and 5.5 kW for variable-torque machines, providing adequate reserve for medium-frame motors in HVAC or process lines. Together with the 2-per-minute switching limit and dual apparent-power ratings, these figures define the thermal and electrical envelope in which the VLT 3000 series unit can operate reliably across repetitive start-stop duty cycles.
