insufficient air in SM52

We changed the sensor and the solenoid valve. eliminate leaks. the gauge pressure indicates a maximum of 11 bars and a minimum of 9 bars; but the machine suddenly stops during operation and restarts after a short time

 

hello dear sir, what is the fault that the machine displays on the screen when the machine stops.

 

the machine displays: insufficient air in the machine.

 

Sir
When we switch on the machine
Input air pressure required is 8.5 bar (error will go) and valve will open. Then supply air reduce to 6.5 bar and go to machine
Inut-sensor- valve -frl
Above is flow of air

 

Hello dear sir, be explicit in your explanations. Why I asked you what the machine displays by default on the screen but you did not answer me? Hello dear sir, please be explicit in your explanations. Why I asked you what the machine displays by default on the screen but you did not answer me? Before working well with the machine and when problems appear, it is necessary to locate the problems so that we can help you.