| 摘要 |
PURPOSE: A door control circuit for a train is provided to improve the operation and maintenance efficiency of trains and to simultaneously switch doors in an engineering cabin. CONSTITUTION: A door control circuit for a train comprises a molded case circuit breaker(NFB), a rear train contact relay(TCR), a front train contact relay(HCR), a door switching switch(SW), a door switching relay(RELAY), and a door switching contact relay(RELAYa). The molded case circuit breaker is arranged in a front train and one end thereof is connected to power. One end of the rear train contact relay is connected to the other end of the molded case circuit breaker to maintain a normal closed state. One end of the front train contact relay is connected to the other end of the rear train contact relay to maintain a normal opened state. When doors are opened after a master control key is inserted in the front train, the front train contact relay is converted to a closed state. One end of the door switching switch is connected to the other end of the front train contact relay. The door switching relay is installed between the other end of the door switching switch and a ground connection. One end of the door switching contact relay and the other end of the front train contact relay are connected to one end of the door switching switch. The other end of the door switching contact relay is connected to a door controller. [Reference numerals] (AA, II) Power; (BB) Front train; (CC) Middle train; (DD) Rear train
|
