175Z7365 by Danfoss

The 175Z7365 is an HVAC variable frequency drive manufactured by Danfoss as part of the VLT 6000 HVAC Drives series. It is intended to regulate the speed of centrifugal fans, pumps, and compressors in building automation, allowing the controller to match motor speed to real-time air-handling or chilled-water demand. By modulating motor frequency instead of using mechanical throttling, the drive helps reduce electrical consumption while maintaining stable airflow or pressure across changing seasonal and occupancy conditions.

This model operates from a three-phase input of 380-460 VAC, a range that aligns with common commercial power systems. Its output capability is 11 kW/15 HP, which supports medium-sized induction motors typically used in large air-handling units. A compact NEMA 1 enclosure enables panel mounting inside conditioned electrical rooms, and local parameter changes can be made through the integrated keypad because the unit comes with an LCP. The internal assembly is supplied as a standard unit, meaning no optional hardware packages are installed. Because the line side is supplied without a filter, external RFI mitigation components may be needed when the installation must meet conducted-emission limits or when nearby equipment is sensitive to electrical noise.

Environmental protection is limited because the circuit boards have no coating, so the drive should be installed where humidity and airborne contaminants are controlled. Communication expansion is not present because the fieldbus slot is supplied with no options; speed reference and command signals must therefore be delivered through hardwired analog or digital inputs rather than a network card. The application tag Graham identifies the assigned building project, and the separate application setting keeps the drive in its default HVAC configuration.