178B7527 by Danfoss

The 178B7527 variable frequency drive is produced by Danfoss and belongs to the VLT 6000 HVAC Drives series. As a dedicated AC drive, it modulates motor speed so that air-handling units, pumps, and chillers consume only the energy required by the load. This version is intended for dependable airflow regulation in medium- to large-scale commercial buildings. Integrating the drive into building automation reduces peak electrical demand and extends equipment life by reducing the need for mechanical throttling devices. Speed control also helps match fan and pump output to changing building demand during daily load swings. The unit supports standard three-phase induction motors used in commercial ventilation systems.

This model operates on a three-phase input of 380-460 VAC, allowing direct connection to distribution panels in large facilities. It has an output capacity of 132/200 kW/HP, providing headroom to start high-inertia fans. The enclosure is Compact NEMA 1, so the electronics are protected from incidental contact and settled dust when panel-mounted indoors. A factory-installed Class A1 filter reduces conducted radio-frequency noise. Operators use the integrated LCP for parameter access, speed indication, and alarm readout. The front interface allows operating values and status information to be viewed directly at the drive.

In building-service applications, the HVAC setup suits variable-torque loads such as centrifugal fans and pumps. The control boards have no coating, so the unit should be installed in a clean, temperature-controlled electrical room. The application option slot and fieldbus port are left vacant, so the drive is supplied with no options. This makes the unit better suited to indoor locations that are free from persistent moisture or corrosive vapors. The drive is provided as a standard unit, so its terminal layout and enclosure dimensions remain consistent with other VLT 6000 models used across multiple air-handling zones.