A mining site in Chile had repeated “Mains decoupling” errors. Most techs blamed grid instability. But the M6 manual’s table of “Minimum grid impedance settings” (page 87) revealed that the for their long feeder cable. Adjusting parameter P3.12 (from 80% to 85% of nominal) solved it. The manual provided the clue, not just the setting.
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Check if the Emergency Stop is engaged (the unit may beep but not start) or if the LT contact is properly grounded in AUTO mode. A mining site in Chile had repeated “Mains