A refrigeration compressor C is controlled by two individual push-buttons (START push-button and STOP push-button). The...

 

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A refrigeration compressor C is controlled by two individual push-buttons (START push-button and STOP push-button). The system requires the use of a compressor turn ON delay function to guarantee pressure equalisation before a restart. Assume that the real application elements and the prototype elements from the PLC panel relate to each other according to the definitions from Table 2. Application Elements START push-button STOP push-button Compressor C PLC Panel Elements Button PB3 Button PB1 Led Indicator L4 Table 2 Develop and test a PLC solution that fulfils the following requirements: ■ If the START push-button is pressed then the compressor C turns ON and remains ON after the START push-button is released. ■ If the STOP push-button is pressed while the compressor C is ON, then the compressor C turns OFF and remains OFF after the STOP push-button is released. ■ If the compressor C turns OFF, it cannot be turned ON before 10 seconds have elapsed. Hint: This task can be accomplished using a turn OFF delay timer. A refrigeration compressor C is controlled by two individual push-buttons (START push-button and STOP push-button). The system requires the use of a compressor turn ON delay function to guarantee pressure equalisation before a restart. Assume that the real application elements and the prototype elements from the PLC panel relate to each other according to the definitions from Table 2. Application Elements START push-button STOP push-button Compressor C PLC Panel Elements Button PB3 Button PB1 Led Indicator L4 Table 2 Develop and test a PLC solution that fulfils the following requirements: ■ If the START push-button is pressed then the compressor C turns ON and remains ON after the START push-button is released. ■ If the STOP push-button is pressed while the compressor C is ON, then the compressor C turns OFF and remains OFF after the STOP push-button is released. ■ If the compressor C turns OFF, it cannot be turned ON before 10 seconds have elapsed. Hint: This task can be accomplished using a turn OFF delay timer.

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