1769-L35CR

變頻器的正反轉控制

①正轉。當按下SB1，KM線圈得電吸合，其主觸頭接通，變頻器通電處于待機狀態(tài)。與此同時，KM的輔助常開觸頭使KM線圈自鎖。這時如按下SB3，KA1線圈得電吸合，其常開觸頭KA1接通變頻器的DIN1端子，電動機正轉。與此同時，其另一常開觸頭閉合使KA1線圈自鎖，常閉觸頭斷開，使KA2線圈不能通電。

②反轉。如果要使電動機反轉，先按下SB5使電動機停止。然后按下SB4，KA2線圈得電吸合，其常開觸頭KA2閉合，接通變頻器REV端子，電動機反轉。與此同時，其另一常開觸頭KA2閉合使KA2線圈自鎖，常閉觸頭KA2斷開，使KA1線圈不能通電。

③停止。當需要斷電時，先按下SB5，使KA1和KA2線圈失電，其常開觸頭斷開（電動機減速停止），并解除對SB2的旁路供電，這時才能可按下SB2，使變頻器斷電。變頻器故障報警時，控制電路被切斷，變頻器主電路斷電。

④控制電路的特點。

a.自鎖保持電路狀態(tài)的持續(xù)，KM自鎖，持續(xù)通電；KA1自鎖，持續(xù)正轉；KA2自鎖，持續(xù)反轉。

b.互鎖保持變頻器狀態(tài)的平穩(wěn)過渡，避免變頻器受沖擊。KA1、KA2互鎖，正、反轉運行不能直接切換；KA1、KA2對SB2的鎖定，保證運行過程中不能直接斷電停機。

c.主電路的通斷由控制電路控制，操作更可靠。

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