(1) The state when the key switch (ACC) is in the on position and the key switch (ACC) is in the 0n position. After the key switch (ACC) is in the on position, the current flows through the open circuit relay L (terminal 5) to make the excitation coil of the relay act.
The throttle motor and the switch inside the potentiometer are connected. After the potentiometer sends a signal, the power supply of the throttle motor is off and stops rotating.
(2) When the key switch (ACC) is in the off position, the state when the key switch (ACC) is in the off position (i.e. engine stop state) is shown in figure 12-43. Stop the motor rotation, the potentiometer acts, the throttle motor stops rotating due to power off, and the engine stops accordingly.
(3) The emergency stop button is in the on position. The state of the emergency stop button in the on position is shown in figure 12-44. When the key switch is in the on position and the emergency stop button is pressed, the coil of the circuit breaker relay generates excitation and turns the switch down. Cut off the excitation voltage of the relay and turn the switch to the top to form a power circuit. The potentiometer rotates to the stop position to stop the engine.
