Another new arrival is a range of regenerative single drives in cabinets that can recover braking energy and feed it into the supply network. The drives cover the power range 250–3,200kW and the voltage range 380–690V. ABB’s DTC (Direct Torque Control) technology allows smooth transitions between the motoring and regenerating modes. The drives are said to guarantee full motor voltage, even when the supply voltage is below nominal, and can deliver unity power factor. They are protected to IP22 as standard, with IP42 and IP54 available as options.
Another new arrival is a low-harmonic, cabinet-built single drive designed for use on weak supply networks where harmonics can be critical. The drive produces extremely low harmonics, without needing external filters or multi-pulse transformers. The drives cover the same power and voltage ranges as the regenerative versions and incorporate the same active supplies to boost output voltages.
There is also a new ACS880 regenerative rectifier unit (RRU), equipped with a separate L-filter module. By limiting IGBT switching to one pulse per cycle, the RRU is said to get more power out of the same power module than an IGBT supply, making it more cost-effective for regenerative applications and for voltage dips.