Product Description:

The 175Z7280 is an AC variable-frequency drive manufactured by Danfoss for the VLT 6000 HVAC Drives series. Acting as a compact motor controller, the unit adjusts the speed of fans and pumps used in air-handling systems and chiller loops. Variable-speed operation can reduce energy consumption while maintaining airflow or pressure set points more efficiently than mechanical dampers or throttling valves. Within an automation system, the drive receives start commands and speed references from a building-management controller, then adjusts motor voltage and frequency in response to changing demand.

The drive accepts a three-phase input of 380–460 VAC, allowing installation on standard low-voltage distribution panels within the supported supply range. Its nominal output capacity is 1.1 kW (1.5 HP), making it suitable for small supply fans, circulation pumps, and booster pumps in zone-level HVAC systems. The Compact NEMA 1 housing supports panel mounting in dry, conditioned electrical rooms where the drive will not be exposed to corrosive substances or excessive moisture. An integrated Class A1 and Class B filter attenuates conducted radio-frequency interference and helps the installation meet common electromagnetic compatibility requirements for commercial buildings. The drive includes an LCP (Local Control Panel) that displays operating information and provides direct access to adjustable parameters. This interface also allows local starting, stopping, speed adjustment, and status monitoring when those functions are enabled by the control setup.

The electronics are supplied as a standard unit configured for conventional fan and pump control without specialized application expansions. Its uncoated printed circuit boards require protection from condensation, corrosive vapors, conductive dust, and persistent high humidity. Suitable cabinet placement and ventilation help protect the internal electronics while allowing normal heat dissipation during operation. A fieldbus communication card is not installed, so external control relies on the built-in analog inputs, digital inputs, and relay terminals. A compatible plug-in communication module may be added later if the building-control network requires a supported fieldbus connection. The order code includes the application designation Graham, while the installed control arrangement remains suitable for standard HVAC fan duty without custom application macros.