Impressive Start Stop Control Circuit
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Start stop control circuit. When the normally open no run pushbutton is pressed k1 picks up shorts or seals the run contacts and powers the load when the run pushbutton is. The most common use of 3 wire control is a start stop control. It also pulls in a contact that is tied in parallel with the start button giving it another path for current flow once your release the start button.
See image below for an example of 3 wire control being used to pull in a contactor to start a 3 phase motor. In its normal position the circuit operates as a simple stop start control. Once the stop button has been pressed this will cut power to td1 and.
When power to td1 is present it will open up the connection to td1 it will make it so that the reverse switch can t be activated. The power source may be either ac or dc and may be at any voltage from 6 to 240v. With the switch closed the control circuit acts as a normal stop start station controlling a load connected to the pilot device power is sitting on the start and seal in terminals of the pushbutton.
The forward button wouldn t need to be held down as once its pressed it would by pass the forward button threw the m1 relay. A very useful ladder logic programming pattern is the start stop circuit. When you press the start button and the stop button is not pressed the 24vdc relay energizes and it pulls in the r1 contactor that feeds three phase power to the motor.
When the jogging button is pressed the hold in contact k1 4 is isolated and the start push button switch is bypassed. While this may be perfectly acceptable for low power applications it is not recommended for high power. The trigger condition takes priority over the break condition the start stop circuit is stop dominant.
The limitation to the first circuit is that the load current flows through the control pushbuttons. However where the state coil is trigger dominant i e. When the stop button is pressed or one of the emergency stop buttons this will break the flow of electricity.
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