How to control the brake lever with a relay
First check the line, check the tracker clutch position is correct, if you exclude the card reader and line problems, open the controller cover, listen to the card when the relay can sound.
The relay is an electrical control device. It has a control system (also known as the input circuit) and the control system (also known as the output circuit) between the interaction. Usually used in automated control circuits, it is actually a small current to control the operation of a large current "automatic switch". So in the circuit plays an automatic adjustment, security protection, conversion circuit and so on.
The control signal as a relay power and power failure trigger on it, to see Daoer barrier system
First look at your barrier is what signal access gate, the general situation will be two terminals will be shorted to open the gate, this time only need to connect the two terminals of the switch to the common and often Start, and then the other end to see how you control the relay
You enter the voltage, the relay action, it will open the gate
Do not understand the words of the relay can work under the search principle
