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2.2 Traditional solution
Whenever B1 or B 2 senses the approach of a visitor, the door is actuated to open. After an elapse of time,
B1 or B2 senses no presence of a visitor; MC 4 will close the door.
2.3 Apply SG2 in Door Control System
Applying SG2 in door control system can simplify the circuit. All that one need to do is connect the
action sensor, limit switch and contactor with SG2.
Devices Applied
z MC1 main door open contactor
z MC2 main door close contactor
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