The air pressure and flow adjustments on your PETRA will have been set when the unit was assembled and should not be altered unless you are experiencing difficulties. The PETRA is designed to accept input pressures between 0.2 MPa (2 bar, 30 psi) and 0.6 MPa (6 bar, 90 psi).


The notes below will help guide you should you need to make any adjustments to the factory settings.


Pressure Regulator


The pressure regulator is used to set a steady 0.2 MPa (2 bar, 30 psi) air supply to the trainer. In operation the orange indicator should be inline with the second mark on the scale, as shown below.



If you need to adjust the pressure you should lift the grey adjuster knob, rotate to adjust the pressure then set the pressure by pressing the adjuster knob back down.


Flow Regulators


A series of flow regulators are found on the unit. Again these should only be adjusted if you are having problems with the factory settings. To adjust, lift the adjuster knob and rotate anticlockwise to increase the flow or clockwise to reduce the flow. Push the adjuster back down to lock the setting.


From top to bottom the adjusters are as follows;


Thickness Sensor Supply - If thick parts are not being detected increase the flow. If thin parts are incorrectly being identified as thick you should reduce the flow.


Plunger Down - If the plunger drops too abruptly reduce the flow. To increase the speed at which the plunger drops increase the flow.


Plunger Up - If the plunger raises too abruptly reduce the flow. To increase the speed at which the plunger raises increase the flow.


Arm Activate (move to conveyor 2) - If the arm moves too abruptly reduce the flow. To increase the speed at which the arm moves increase the flow. 

The arm should take 1 to 2 seconds to complete its movement and not hit the end stops too vigorously. 


Arm Return (return to conveyor 1) - If the arm moves too abruptly reduce the flow. To increase the speed at which the arm moves increase the flow. 

The arm should take 1 to 2 seconds to complete its movement and not hit the end stops too vigorously.