175Z7362 by Danfoss

The 175Z7362 is an HVAC variable speed drive manufactured by Danfoss as part of the VLT 6000 HVAC Drives series. The unit modulates the speed of three-phase fan and pump motors so air-handling and chiller systems can follow real-time load commands from building automation controllers. By adjusting motor frequency instead of using mechanical throttling, the drive reduces energy demand and helps maintain stable process variables such as airflow, pressure, and water temperature. This operating approach is well suited to systems that need smooth response to changing occupancy, seasonal load shifts, and part-load operation.

This model operates from a 200-240 VAC three-phase supply, a range chosen to match low-voltage distribution in commercial buildings. Its power section is rated at 15 kW / 20 HP, allowing direct connection to medium-sized supply and exhaust motors without an external step-up transformer. The housing is a Compact NEMA 1 enclosure, which permits panel mounting inside conditioned electrical rooms while still providing finger-safe protection when the cabinet door is open. A front-mounted LCP (Local Control Panel) provides parameter access and manual start-stop commands for local operation or maintenance. Electromagnetic compliance must be handled externally because the drive is shipped without an RFI filter, so external filtering can be matched to local EMC rules.

The application code is Graham, a factory parameter set that aligns the drive's default ramps and PID gains with common air-volume control loops. Because the hardware is supplied as a standard unit, there are no built-in bypass contactors or damper relays, so those accessories must be added externally if needed. Network integration is optional; the fieldbus slot is delivered with no fieldbus options installed, so commands are taken from hard-wired I/O or the LCP. For additional protection needs, the circuit boards are supplied with no protective coating, which makes the unit better suited to clean indoor electrical environments.