Application Note: Three-Wire Control (STA, STP, F/R) with L100 and SJ100 Series Inverters Please refer also to the L100 or SJ100 Inverter Instruction Manual AN021003-1 Rev. 1 11-14-03 Hitachi America, Ltd. © 2003 Hitachi America, Ltd.
This often occurs when a machine is being retrofitted or upgraded with the addition of a Hitachi inverter as a replacement for a motor starter. The pushbuttons that interfaced with the original motor starter would typically be a single- pole normally-open momentary pushbutton for the START button, and a single-pole normally-closed momentary pushbutton for the STOP button.
RUN REV STA REV STA FWD L100 or SJ100 Inverter IN 1 [FWD] IN 2 [REV] RUN FWD RUN REV In this circuit, pushing the STA FWD button would start the inverter in the forward direction, while pushing the STA REV button would start reverse operation. If it is desired to change rotation direction while running, the STOP button would have to be pushed first, then the desired run direction button.