... interface RS-485 (Baud rate 38400)Energy saving & automatic voltage regulationAdjustable V/F curve & Simple vector controlAutomatic adjustment of ... 1 st/2nd frequency source selectionsProtective FunctionsSelf-testing, Over Voltage, Over Current, Under Voltage, Overload, Overheating, ExternalFault, Electronic thermal, Ground Fault ... 0.6G) at 20 to 50HzApprovalsC € © FST-500 mini SVC frequency converter