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IRB52 Paint Robot Atom and Shape Pressure Problem

Hello everyone,

We use IRB52 Painting robot for paint plastic parts. We have a problem about atom and shape pressures.

We have 7 bar system pressure. For example I set atom pressure 1.5 bar. When robot start to paint, atom pressure start with 1.5 but it starts to increase slowly until 7 bar about 15 sec.

We have same problem with Shape pressure. I measure atom and shape pressure with different set values using manometer so results always the same. 

At the beginning pressure value is same with set value after that increase slowly until max pressure. 

Is there any solution or advice about this problem?

Thank you.