175H1203 Danfoss

Product Description:

Danfoss manufactures the 175H1203 as part of the VLT 3000 Variable Speed Drives series. This three-phase AC inverter regulates motor speed in constant-torque and variable-torque applications found in pumps, fans, and material-handling equipment. By converting fixed mains voltage into a modulated output, the drive lets a PLC or stand-alone control panel match motor speed to process demand, reducing mechanical stress and energy use inside an automation cell.

The inverter’s power section is rated for an apparent demand of 9.3 kVA at constant-torque duty and 11.5 kVA at variable-torque duty. Under constant load it can deliver a continuous mechanical output of 5.5 kW, while centrifugal loads that fall with speed can be supplied up to 7.5 kW. For constant-torque operation the input current limit is 13.0 A, matched by the same 13.0 A on the output terminals to keep thermal stress on busbars balanced. Variable-torque mode allows higher electrical throughput, so output current rises to 16.0 A and switching frequencies are adjusted automatically to maintain semiconductor temperature. These parameters let system designers size upstream protection and cooling without iterative derating.

The supply side can draw up to 17.0 A during heavy acceleration, so there is maximum fuse or circuit breaker of 25 A on the mains feed. Control wiring and motor leads fit screw terminals that accept conductors up to 2.5 mm², simplifying integration with standard IEC cable sets. The drive operates on utility grids at 50/60 Hz and permits no more than two start commands per minute, a safeguard that limits inrush heating of the DC link capacitors. By coordinating these limits with the stated 16.0 A variable-torque output current, installers can align overload relays, cable ampacity, and thermal monitoring strategies without exceeding component ratings.