Описание работы типовых релейно-контакторных электрических схем управления электроприводами, страница 10

               А    В    С           N                                                                                                                                                                                                                                                                                                                                                                                             QF1                              SB1        SB2                                    KM1                                                                                                                                                                                                                                                                                                                                                                                                                                          KM1.1                                            KM1                                                                                                                                                                                                                                                                                                                                                               С                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       М1                                                                                                                                        Рисунок Е13 – Схема управления электроприводом                                                                         с возможностью осуществления кон-
                                                                 денсаторного торможения постоянно
                                                                 подключенным конденсатором

                А    В    С           N                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       SB2                                                                                         QF1                                 SB1                                            KM1                                                                                                                                                                                                                                                           KM2.1                                                                                                                                                                                                                                          KM1.1                                                             KM1                 KM2                                                                                                                                                                                                                                                                                                                                                                                                                                                                 KM2                                                                                     SR                            KM1.2                                                                                                                                                                                                                                                                                                                                                    SR                                                                                                М1                                                                                                                                                                                                                                                                           

Рисунок Е14 – Схема управления нереверсивным электроприводом с

возможностью осуществления торможения противо-           
      включением в функции скорости

При включении контактора КМ1 и вращении двигателя, контакт SR1.3 замкнут, контакт SR1.4 разомкнут. Поэтому при нажатии кнопки стоп SB1.1 контактор КМ1 отключится, а контактор КМ2 через замкнутый контакт SR1.3 включится. Начнётся торможение двигателя. Контакт SR1.3 будет включенным до тех пор, пока скорость вращения ротора не упадет до значения уставки величины отпускания контакта. При включении контактора КМ2 замкнётся блок-контакт КМ2.1, но на самопитание контактор не встанет, так как контакт SR1.4 разомкнут. Контакт SR1.4 остаётся разомкнутым до тех пор, пока скорость вращения ротора не упадет до значения уставки величины отпускания контакта.