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Relay ladder logic practice problems

Relay ladder logic practice problems - EE369 Industrial...

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EE369 Industrial Automation Relay Ladder Logic Practice Problems Use the Common Electronic Symbols chart and the notes form the lecture to draw the ladder logic diagram (control circuit) for the following problems. 1. A three-phase motor is controlled using a motor starter relay as follows: the motor can be started using either N.O. pushbutton ‘Start 1’ or ‘Start 2’. When the motor starts, it seals itself and runs continuously until a N.C. ‘Stop’ pushbutton is pressed. A Red light indicates that the motor is running. 2. A three-phase industrial motor can be started using a N.O. ‘Start’ pushbutton. Once the motor is started, it seals itself in and a Red light indicates that the motor is running. The motor can be stopped from two separate locations using either ‘Stop 1’ or ‘Stop 2’. 3. A three-phase industrial motor can be controlled in Jog mode (non-sealing) as follows: Pressing a N.O. pushbutton ‘PB1’ turns a Red light on and it stays on. While the Red light is on the motor can be jogged by pressing another N.O. pushbutton ‘PB2’. While the
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