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Funkci bi-level by tahle svářečka měla mít pouze ve verzi Pro a Pro-X, verze bez tohoto přívlastku tuto funkci nemá...

Tak v manuálu to píšou... Vše je volně dohledatelné.

4.2.3 Bi-Level feature description
Bi-Level is active only when the pulse welding is off. This feature allows to switch between previously
provided welding current values ( Ib and Is ). It it mostly used when welding material with various
thickness or when there is a need to use two different amperage values without putting the arc off.
To use the feature first pulse welding must be put to off. Than using the torch control mode button select
Bi-Level. it is described with an r symbol and a value from 2 to 10 seconds. It is the time you need to
press the button to terminate welding. After the feature is activated the welding current Ib and Is can be
provided.
To conduct welding hold the button on the torch handle until arc ignites. While you hold the button the
device keeps the base current ( Ib ). To switch between previously provided amperage values release
the button. Afterwards the device sets the second provided amperage which is welding current ( Is ). If
you want to switch back to the previous amperage value ( Ib ) you need to quickly press and release
the button. And again if you want to switch between the values you need to press and release the button.
To terminate the welding press and hold the button for the time previously selected ( r ).

Magnuma nemám, vše mám pouze z netu, ale pokud jsi si jistý, že postupuješ přesně podle manuálu není důvod aby to nešlo...

Tak co pánové opravdu se nenajde nikdo kdo by byl ochotný to v vyzkoušet a dal vědět jak to je