Introduction to Industrial Automation

Figure 5.18  A single-acting cylinder with automatic return pneumatic circuit and components (a), 

and an electric automation circuit (b).

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  Introduction to Industrial Automation

automation circuit is equivalent to the one for the operation of an electric motor with a reverse 

option. Instead of the two relays for changing the phase connections, in this case, we have the two 

equivalent solenoids of the electro-valve that also should never be activated at the same time.

When an electro-pneumatic automation includes a large number (greater than three) of cyl-

inders, as well as the desired operation (which involves a complex combination of extension and 

(a)

Pneumatic circuit and equipment

 

 

Storage

a

b

Flow control valve

Air compressor

N

C

R

C

START

 

STOP

d

1

C

Up

Down

d

2

a

b

d

1

d

2

Air

compressor

d

1

d

2

(b)

Automation circuit

Figure 5.19  A light-object elevator with a double-acting cylinder, manual control of its piston