Compressed Air Motor - fischertechnik COMPUTING ROBO TX ElectroPneumatic Manual

COMPUTING

Compressed air motor

For your first model, build the "compressed air motor" as
described in the assembly instructions. A compressed air
or pneumatic motor functions similar to a steam
engine. It has a cylinder, a piston, an intake and
an outlet. However, compressed air serves as the
"propellant" instead of hot steam. For the first task install
the button so that you can press it with your hand.
3/2-way valve
Technical information on pushbutton.
The pushbutton has three connections or terminals. Depending on the application you can use the push-
button ....
... as a "normally open switch":
Pneumatic cylinder
By connecting terminals 1 and 3.
When the pushbutton is
When the pushbutton is not pressed: Electricity does not flow
... or as a "normally closed switch":
By connecting terminals 1 and 2.
When the pushbutton is
Pushbutton
When the pushbutton is not pressed: Electricity flows.
Wire the electrical components as described in the assembly instructions in circuit diagram A.
Task 1: Manual control with pushbutton.
Press the button and observe the model. What makes the wheel turn and how?
As you can see, each time you press the button the solenoid valve switches and the cylinder extends.
This causes the wheel to rotate half a turn. When you release the button, the wheel rotates another half
turn. This is accomplished by the return spring in the pneumatic cylinder.
Task 2: Control with switching plate.
Turn the pushbutton to the installation position specified. Instead of pressing the button manually, it
Switching plate
is now actuated by a switching plate. How will this affect the model?
Switching plate
pressed: Electricity flows.
pressed: No electricity flows.
It is necessary to switch the valve on and off at the right time.
Then the wheel will rotate continuously.
Pushbutton
Important! Adjust the switching plate so that the pushbutton
switches the valve exactly when the crank is in the top-most
or bottom-most position.
For the next task install the ROBO TX Controller in the model
and wire the electrical components as described in circuit B in
the assembly instructions.
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ROBO TX ElectroPneumatic
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