175H7375 by Danfoss

The 175H7375 is an AC variable-frequency drive produced by Danfoss within the VLT 3000 Variable Speed Drives series. Designed for panel mounting in process, HVAC, and material-handling equipment, the unit modulates three-phase induction-motor speed so torque and energy use match real-time demand. By rectifying the incoming line and reconstructing a variable-frequency output, it enables soft starting, controlled ramping, and steady-state regulation over a broad load range. This arrangement helps reduce mechanical shock at startup and improves speed control when demand changes during operation. The drive incorporates analog and digital control paths for PLC-based automation and is well suited for pumps, fans, and conveyors operating in continuous-duty settings.

The drive accepts a three-phase input supply in the 440/460/500 V (3-Phase) class and synchronizes to industrial power systems at 50/60 Hz. In constant-torque mode, it delivers up to 12.6 kVA of apparent power and produces a motor line current of 14.5 A during normal operation. Short-term overload capability reaches 23.2 A for sixty seconds, supporting acceleration of high-inertia loads without tripping. This operating range is useful in applications that need brief overload margin during startup or temporary load spikes. These electrical limits affect heat sink sizing, cable cross-sections, and the ambient derating curve required for cabinet design.

Overall efficiency reaches 0.96 at full load, which helps limit waste heat and simplifies enclosure ventilation. Upstream protection is provided by a 30 A time-delay pre-fuse that clears phase faults while tolerating inrush current. The control board offers a selectable 0/4-20 mA or ±10 V process-signal path that can serve as an input or a feedback output, and it can drive loads to 470 ?. A 24 VDC, 140 mA source powers digital sensors, and a relay output rated at 250 VAC, 2 A provides run-status interlocking for related equipment. The sensor supply and relay contact support straightforward connection to switches, transmitters, and external status circuits without requiring separate interface modules.