Different positions of a group-changing pneumatic circuit for four cascade groups used for eliminating signal conflicts are illustrated in Figure below.
Three pilot-operated 5/2 DC valves (reversing valves) are used to realize the group changing circuit.
Figure | Different power supply positions of a four-group circuit
Initially, the supply is in the last group, G4, as shown in the Figure (d).
When a control signal is applied to the input e1 of the group-changing circuit, the power supply changes to the group G1 from the group G4, as shown in Figure (a).
When a control signal is applied to input e2 of the group-changing circuit, the power supply changes to the group G2 from the group G1, as shown in Figure (b).
When a control signal is applied to the input e3 of the group-changing circuit, the power supply changes to the group G3 from the group G2, as shown in Figure (c).
When a control signal is applied to the input e4 of the group-changing circuit, the power supply changes to the group G4 from the group G3, as shown in Figure (d).
Textbook on ‘Pneumatic Systems and Circuits -Advanced Level’
By Joji Parambath
The book highlights the problem of signal conflicts and various methods of their elimination in detail. The developments of multiple-actuator circuits using cascade method and shift register are explained through many examples.
Therefore, when the control signals are applied to the inputs e1, e2, e3 and e4 in that sequence, the supply changes to the groups G1, G2, G3 and G4, respectively, across the cascade.
The cascade circuits can be developed for any number of groups. The arrangement will always remain the same.
Joji Parambath
Trainer / Author
Fluidsys Training Centre Pvt Ltd
Bangalore, India
Amazon Author link: https://www.amazon.com/author/joji
joji books 