Выбор аппаратуры управления, защиты, регулирования, контроля параметров и перемещения для надёжной безаварийной работы электропривода, страница 6

Реле минимального напряжения представляет собой механизм, основными частями которого является: катушка напряжения с высоким коэффициентом возврата, механизма реле, контактная система, узел регулирования уставки срабатывания и в некоторых случаях шкала настроек. Изменение величины контролируемого напряжения воспринимается катушкой напряжения, если напряжение ниже предела настройки, то якорь реле не может удержаться в притянутом положении к сердечнику. Якорь отпадает от сердечника и через механизм реле воздействует на контактную систему. При восстановлении напряжения до величины уставки якорь притягивается к сердечнику реле и через механизм реле происходит переключение контактов.

Шины энергоснабжения                                                                                                                                                       А                                                                                                                                                                                             В                                                                                                                                                                                             С                                                                                                                                                                                              N                                                                                                                                                                                                                                                                                                                                 SB2                                                                                       QF1             KV1            KV2         SB1                                                        KL1                                                                                                                                                                                                                                 KV1            KV2                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           KL1.1                                                                                                                                                                                                                                                                                                                                               KL1.2            SA1                                                   KM1                                                                                                                                     I         О                                                                                                              KM1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         M1

Рисунок 3.4 – Схема включения реле минимального напряжения в схему управления электроприводом

                                  при управлении командоконтроллером

Шины энергоснабжения                                                                                                                                                       А                                                                                                                                                                                             В                                                                                                                                                                                             С                                                                                                                                                                                              N                                                                                                                                                                                                                                                                                                                                 SB2                                                                                       QF1             KV1                             SB1                                                        KM1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     TV1                                                             KM1.1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   KV1