The figure below illustrates different positions of a group-changing pneumatic circuit for four cascade groups used to eliminate signal conflicts.
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 Figure (d).
When a control signal is applied to the input e1 of the group-changing circuit, the power supply changes to group G1 from 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 group G2 from 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 group G3 from 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 group G4 from group G3, as shown in Figure (d).
Textbook on ‘Pneumatic Systems and Circuits -Advanced Level’
By Joji Parambath
The book details the problem of signal conflicts and various methods of eliminating them. It also explains the developments of multiple-actuator circuits using the cascade method and shift register 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 groups G1, G2, G3 and G4 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
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