... switch. The step is one. Standard RS485/232comunication interface;With the protective functions of over current, short- circuit, low ... status, loop on-line status,insulation status, fault type and others;With functions of fault check, fault memory;Configured in the ... Voltage(V)1140,660 Control modesSingle motor-single speed,double motor-single speed,single motor-double speed,double motor-double speed, ...