178B4810 by Danfoss

The 178B4810 belongs to the VLT 6000 HVAC Drives series manufactured by Danfoss. It is a dedicated HVAC variable-frequency drive that modulates three-phase induction motors for air-handling units, pumps, and chillers. In these systems, the drive varies motor frequency and voltage so fans and pumps do not have to run at full speed when demand is low. That operating method supports steadier airflow and water circulation across changing load conditions in building automation. It is intended for variable-speed duty in large building service systems.

This drive has an output rating of 90/125 kW/HP and operates on a three-phase supply of 380-460 VAC. The unit uses a Compact IP 20 enclosure for cabinet installation where basic finger protection is acceptable. Conducted emissions are reduced by an integrated Class A1 and B filter, which can help limit interference on connected power lines. The front-mounted interface includes an LCP (Local Control Panel), allowing operators to adjust speed, setpoints, and diagnostics without external hardware. No fieldbus card is installed, but open expansion slots allow later addition of BACnet, Modbus, or LonWorks communication. The available communication bay keeps the base unit flexible for future building-management integration.

The control scheme uses the HVAC application macro, and the power stage follows the Standard unit topology. The board set has no coating, which suits installation in dry electrical rooms with controlled ambient conditions. Communication slots are supplied with blanking plates because the drive has no options installed, while a parallel terminal strip still supports basic start/stop commands and an analog speed reference. This arrangement also suits stand-alone control wiring when the drive is operated from conventional building control signals rather than a network card. Unused slots remain covered until an optional communication module is required.