“By combining the advanced features of the VLT HVAC Drive with the advanced performance of these Packaged Solutions, Danfoss is uniquely positioned to provide complete, advanced solutions to the HVAC market that to date have simply been unavailable,” says Ed Smith, former HVAC product manager. “All packages allow the customer to match the capabilities of the Packaged Solution with the specific needs of the application,” he says.
Each package provides improved protection and operation through a first-of-its-kind bypass 24VDC switch mode power supply. Contactor operation is maintained in harsh conditions, and drive operation can be maintained at a reduced output with an input voltage as low as 70 percent of nominal voltage, or with one input phase missing. This improves operation over standard transformer power supplies or power supplies that only operate off of two legs of input power. Additionally, the unique power supply acts as a backup power source to the drive logic for ECB packages when power is removed from the drive’s input terminals. This allows operation of all control features to remain active in drive and bypass modes.
Packages are available in either two contactor or three contactor configurations, from ½ HP through 350HP at 460 & 600VAC, or ½ HP through 60HP at 208 and 230VAC. NEMA/UL Type 1 or Type 12 enclosures are available for all package configurations, and in many cases the physical size of the packaged solution does not change with the enclosure rating. All packages include drive-only input fusing. A wide range of optional power features are available including contactor motor selection, input reactors, dV/dt filters, and selection between input disconnect, fused disconnect or circuit breaker.