140CPS42400C Quantum

140CPS42400C K1與K2兩組線圈都斷電時，K1與K2繼電器的公共端(COM)與常閉(NC)觸點連通，公共端(COM)與常開(NC)觸點斷開，電機的兩根線僅接入GND，電路并沒有形成回路，這時電機不會轉動。

K1繼電器線圈導通而K2繼電器線圈斷開，K1繼電器的公共端(COM)與常開(NO)觸點連通，K2繼電器公共端(COM)與常閉(NC)觸點，這時電流從電源正極經過K1繼電器的常開(NO)觸點到K1繼電器的公共端(COM)觸點，再流經電機的正極接線端，從電機的負極接線端流出后經過K2繼電器的公共端(COM)，再流過K2繼電器的常閉(NC)觸點回到電源的負極，此時電機正向導通，即電機正轉。

K1繼電器線圈斷開而K2繼電器線圈導通，K1繼電器的公共端(COM)與常閉(NC)觸點連通，K2繼電器公共端(COM)與常開(NO)觸點，這時電流從電源正極經過K2繼電器的常開(NO)觸點到K2繼電器的公共端(COM)觸點，再流經電機的負極接線端，從電機的正極接線端流出后經過K1繼電器的公共端(COM)，再流過K1繼電器的常閉(NC)觸點回到電源的負極，此時電機反向導通，即電機反轉。

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