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Everything in that response from Felder looks right to me with the exception of the statement that the black wire is on L2. Traditionally, the L2 connection has been the brown wire, but there have been instances of it being wired incorrectly at the factory. ? I strongly advise you check the schematic and do some continuity testing when your machine arrives to figure out which color wire is actually on L2 at the Felder machine end.?

There is conventions...

... but there seems to be no strict adherence (from the Felder factory) for phases and there colors, luckily they do agree on Neutral (N, blue) and Protective Earth (PE, green).

Traditionally in single phase systems L (phase) is brown, most likely there fore also for L1 (1st phase, in a three phase system).