... optionalSpeed inverterAn AC Frequency inverter installed in a panel controls the RPM of the Disperser shaft from 0-1500 ... on off, ammeters, voltmeter, emergency stop, inverter trip, indicating lamps, speed control switch, RPM indicator. All internal wiring ... the following ex proof controls. Main motors on off, ammeters, voltmeter, emergency stop, inverter trip, indicating lamps, speed control switch ...