ABB ACH580-01-077A-6 55 kW HVAC drive. ABB ACH580-01-077A-6 is an ACH580 HVAC drive rated 55 kW, 77 A, 500-600 V, frame R5. It is designed for air-handling units, chillers, cooling towers, pumps and ventilation fans, with ABB drive control and energy-efficient motor operation.