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Bystronic Bystar 3015 with BTL-3000_Can't go over 1,5kW Power

Bystronic Bystar 3015 with BTL-3000_Can't go over 1,5kW Power

Bystronic Bystar 3015 with BTL-3000_Can't go over 1,5kW Power

We have a problem with old but very good taken care Bystar 3015 (1998 model)

Problem is laser power can't pass 1,5kW, after passing this, it falls back.
Therefore, we can't cut over 5mm steel. Other than this, it works fine and it doesn't give any error.

-We have change vacuum blower and Inverter as of last year after 25 years.
-System has no leak.(0 hbar/h)
-We have changed/tried new gasmixer and change valves on old one.(and at the other mid block as well.)
-Renewed capacitors at high voltage part.

Service says its gasmix but we put another used one to test the theory but result is exactly same.
(New Part is expensive and after trail it doesn't make any difference)

This is a very tricky problem for us, because there is no errors.
We are looking for a possible water leak and such but it seems not the case.

Any possible ideas is apricated in terms parts or cause.

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