A new high-performance variable frequency drive (VFD) offered by Invertek Drives is designed to help original equipment manufacturers (OEMs) optimize the performance and lower the energy costs of brushless DC compressors used in heat pumps and condensing units.
The Optidrive Coolvert is claimed to be one of the smallest in its class, providing machine builders with opportunities to reduce panel space and lower machine costs. Designed to operate specifically with carbon dioxide refrigerant condensing systems, the VFD can provide end-users with energy savings of up to 25%. In addition to boosting energy efficiency, it will help OEMs comply with the EU’s fluorinated greenhouse gas 
Source: Invertek Drivesregulations.
The drive is compatible with all motor types including induction, permanent magnet, brushless DC, synchronous reluctance and line-start machines, with ratings from 1.5 to 11 kW (2 to 15 hp). It has single- and three-phase 200 to 480 V inputs. Invertek claims that the new drive has the widest ambient operating temperature range in its class (-20° C to 60° C), making it ideal for use in a wide range of environments, including retailer chill and freeze refrigeration systems.
The open Modbus RS-485 communications allow connection to any external controller, giving OEMs freedom to choose which components they use. They can also set up optional Bluetooth connections using Invertek’s Optistick Smart device.
Through-panel mounting allows chilled air from the condenser to cool the drive’s power electronics. OEMs can use small panels while removing heat generated by the drive and maintaining IP20 front and IP55 rear protection ratings. A three-step start-up sequencing profile lowers the risk of oil migration, while compressor-specific protections include minimum on and off times and restart delays. A safe torque-off input provides extra protection.
The drives comply with the EN 61000-3-12/EN 61000-3-2 harmonics standards without needing external equipment.
