Product Description:

The 175Z7281 variable-frequency drive is manufactured by Danfoss within the VLT 6000 HVAC Drives series. It is an AC inverter intended for fan and pump duties in commercial buildings, where precise motor speed control can reduce energy use and equipment wear. By supplying a programmable frequency to the motor rather than relying on mechanical throttling, the unit supports automated airflow and hydronic loops. It connects directly to the three-phase motors commonly installed in packaged air-handling systems.

This drive delivers 1.5 kW, or 2 HP, of continuous mechanical power, making it suitable for standard ventilation tasks. It accepts a supply of 380 to 460 VAC, so it can be wired to typical industrial mains without a transformer. A compact NEMA 1 enclosure allows mounting inside electrical rooms while providing basic protection against accidental contact and dust. Conducted interference is reduced by the integrated Class A1 and B filter, helping the installation meet commercial electromagnetic compatibility requirements. The drive includes a Local Control Panel that allows on-site parameter adjustment and fault review without external tools. The plug-in panel also gives operators direct access to operating values and basic drive controls.

The drive is supplied as a standard unit without additional input/output or specialty hardware. Its circuit boards have no conformal coating, so the device is intended for clean, noncorrosive control cabinets. The drive uses the Graham application programming package for common HVAC operating sequences while allowing control through connected external devices. It has no fieldbus options, leaving the communication expansion slots empty. Analog references or commands entered through the local panel can provide the required speed setpoints. These control methods allow the inverter to regulate connected fan or pump motors without an installed network communication module.