Product Description:

The 175H3137 is a variable frequency drive manufactured by Danfoss for the VLT 3000 Variable Speed Drives series. As a programmable power converter, it modulates the voltage and frequency supplied to three-phase induction motors, enabling closed-loop speed regulation in conveyors, pumps, and fan assemblies. Within an automation cell, it sits between the mains supply and the motor, translating process commands from PLCs into precise electrical output so that mechanical motion aligns with production requirements while reducing energy drawn during partial-load operation.

In constant-torque mode, the drive accepts a line current of 13 A, and that input supports a rated apparent power of 9.3 kVA while delivering a shaft output of 5.5 kW. A rated output current of 13.0 A feeds the motor through vector control, and the integrated RFI filter suppresses conducted noise to comply with EMC limits. Digital modulation steps are resolved to 0.05 %, allowing small speed increments, and the synthesized waveform can be extended up to 500 Hz for oversynchronous duty on high-speed spindles. Because semiconductor stress rises each time the mains contactor closes, the electronics are limited to one power-up command per minute, a safeguard that helps extend power stage life.

When the application demands higher flux under reduced load cycles, the variable-torque profile raises the permissible line draw to 17 A and increases the inverter’s capacity to 11.5 kVA. Under this profile, the output modules can continuously supply 16.0 A to the motor, translating into a typical shaft capacity of 7.5 kW that suits centrifugal pumps and axial fans where torque falls with speed. The alternate ratings allow a single enclosure to support different duty types, matching thermal limits to process characteristics without changing field wiring or control parameters.