175H1738

The Danfoss 175H1738 variable speed drive is a robust member of the VLT 3000 Variable Speed Drives series, designed to deliver high-performance motor control in demanding industrial environments. Rated at 3 HP, this drive provides precise regulation of motor speed and torque, ensuring smooth acceleration and deceleration across a wide range of applications. Its programmable output frequency range of 0–120 Hz and high efficiency of 96% at full load contribute to significant energy savings and lower operating costs. Constructed with an enclosure rated to IP21/IP54, the 175H1738 offers solid protection against dust ingress and limited moisture exposure, making it suitable for installation in both clean and challenging plant conditions. With an input voltage specification of 3 × 460 V AC and compatibility with 50/60 Hz supply frequencies, this drive integrates readily into standard three-phase power systems.

The technical architecture of the 175H1738 encompasses a comprehensive set of specifications tailored for industrial automation. It delivers an output current of 7.5 A with an output voltage range of 0–100% of mains, and maintains a power factor of 0.9 under rated conditions. The motor protection subsystem features an Electronic DIN 44081 thermistor that continuously monitors motor temperature, providing real-time feedback to prevent overheating and extend motor life. Programmable ramp times span from 0.1 to 3600 s, granting fine-tuned control over acceleration and deceleration profiles. The drive supports motor cable runs up to 300 m and withstands a relative humidity of up to 95% RH (non-condensing), ensuring reliable operation across extended cable deployments and humid environments.

Operationally, the 175H1738 excels in both performance stability and environmental resilience. It is rated for an ambient operating temperature range of -10 °C to +40 °C and can endure storage temperatures from -25 °C to +70 °C, guaranteeing consistent functionality through seasonal variations and maintenance intervals. The combination of high efficiency and programmable speed control reduces mechanical stress on connected equipment, minimizing wear on gears, belts, and couplings. Integrated motor protection via the thermistor prevents unplanned downtime by proactively detecting thermal anomalies. The dual enclosure rating (IP21/IP54) supports installation in control cabinets as well as more exposed field locations, enabling versatile deployment across production lines.

System integration of the Danfoss 175H1738 is streamlined through standard communication interfaces and compatibility with common fieldbus protocols, facilitating seamless connectivity in modern industrial control architectures. Its programmable parameters can be adjusted via a front-mounted keypad or through remote PLC control, supporting advanced automation scenarios in conveyor systems, pumps, fans, and HVAC installations. The drive’s robust protection features and flexible mounting options make it an ideal solution for manufacturers seeking reliable speed regulation in applications ranging from process industries to material handling and water treatment plants.