Step 7: Powering the Motor Control System
The relays need their own separate supply of 12V to actuate them . The relays will be actuated by the the main 12 volt power supply of the motors. The reason we can't connect them directly to the computer switching circuit ( we will deal with that in the next step) is because that circuit can only handle 4 amps , and our motors draw 11 amps each . The relays draw less than 4 amps and can therefore control the motors easily.