Описание работы типовых релейно-контакторных электрических схем управления электроприводами, страница 7

            А    В    С              N                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                QF1                         SB1         SB2          SQ1.1               KM1                                                                                                                       
                                                                                                          KM2.2                                                                                                                                                                                                                                KM1.1                                                                                                                                                                                                                  KM1                     KM2                                                                                                                                                                                                                                                                                                   SQ1.2                                                                                                                                       SQ2.1             KM2                                                                                                                                                                                                                                                   KM1.2                                                                                                                                                          M1              М1                                      KM2.1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                TV                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  KM1.3                             HL1                                                                                                                                                                                                                                                                                                                                                           KM2.3                             HL2                                                                                                                                                                                                                                                                                                       

Рисунок 7.10 – Схема управления электроприводом обеспечивающая
                                     работу по циклу: ход «вперёд», реверс, ход «назад» и
                                     останов в исходном положении

          Если в рассмотренную схему включить параллельно кнопки пуск SB2, замыкающий контакт конечного выключателя SQ2, то получится схема управления электродвигателем (рисунок 7.11). Данная схема управления позволит управлять двигателем производственного агрегата по циклу: ход «вперёд», реверс в функции пути (положения), ход «назад», реверс в функции пути (положения) и далее повторение цикла до тех пор, пока не будет нажата кнопка стоп SB1.