178F6424 by Danfoss

The 178F6424 is a variable-frequency HVAC drive produced by Danfoss as part of the VLT 6000 HVAC Drives series. The unit modulates the speed of three-phase induction motors in air-handling units, pumps, and chiller compressors. By varying output frequency and voltage, it helps building systems match motor speed to changing ventilation and circulation demands instead of running continuously at full output. This allows airflow and water flow to track real-time building demand while reducing energy use and mechanical wear in industrial automation and building-services installations.

This drive accepts a three-phase supply of 380-460 VAC and supports motors up to 1.1 kW / 1.5 HP. Its slim book-style IP 20 housing allows dense cabinet mounting where only finger-safe touch protection is needed. Communication with supervisory controllers is handled through an integrated DeviceNet fieldbus that exchanges setpoints, status bits, and alarm codes without additional gateways. To control conducted emissions, the power stage incorporates a combined Class A1 and Class B filter for use on light-commercial and industrial mains. The unit has no conformal coating, so it should be installed in a clean, dry enclosure, and a removable local control panel provides parameter access and local override keys.

Because the drive is intended for HVAC applications, it includes fan and pump control functions suited to building-services equipment. The front-mounted interface identified as With LCP allows local access to operating values and settings. The unit comes with no options, so no extra sensor boards or relay cards are installed. Sleep mode, fire override, and proportional-integral control remain available in this baseline form, which supports standalone fan and pump duties without additional option hardware.