Implement the hardwired tank filling and emptying operation shown in Logix forma
ID: 1840245 • Letter: I
Question
Implement the hardwired tank filling and emptying operation shown in Logix format. The operation of the control circuit can be summarized as follows:
-Assuming the liquid level of the tank is at or below the empty level mark, momentarily pressing the FILL pushbutton will energize control relay 1CR.
-Contacts 1CR1 and 1CR2 will both close to seal in the 1CR coil and energize normally closed solenoid valve A to start filling the tank.
-As the tank fills, the normally open empty-level sensor switch closes.
-When the liquid reaches the full level, the normally closed full-level sensor switch opens to open the circuit to the 1CR relay coil and switch solenoid valve A to its de-energized closed state.
-Anytime the liquid level of the tank is above the empty-level mark, momentarily pressing the EMPTY pushbutton will energize control relay 2CR.
-Contacts 2CR1 and 2CR2 will both close to seal in the 2CR coil and energize normally closed solenoid valve B to start emptying the tank.
-When the liquid reaches the empty level, the normally open empty-level sensor switch opens to open the circuit to the 2CR relay coil and switch solenoid valve B to its de-energized closed state.
-The stop button may be pressed at any time to halt the process.
Solenoid A Full tank sensor L1 L2 Fill Stop 1CR 1CR1 Full tank senso 1CR2 Solenoid A Empty tank Empty tank sensor sensor Empty Control panel eX 2CR Stop Fill e Empty Solenoid EB 2CR1 Empty 2CR2 Solenoid BExplanation / Answer
The sequence of operation to implement the process follows:
1) Normally open start and normally closed stop pushbuttons are used to start and stop process.
2) When the start button is pressed,solenoid A energizes to start filling the tank.
3) As the tank fills,the empty level sensor swicth closes.
4) When the tank is full,the full level sensor swicth closes.
5) Solenoid A is de-energized.
6) Agitate motor starts automatically and runs for 3 min to mix the liquid.
7) When the agitate motor stops,solenoid B is energized to empty the tank.
8) When the tank is completely empty,the empty sensor swicth opens to de-energize solenoid B.
9) The start button is pressed to repeate the sequence.