Hi all, got a kemppi 4000/k400 kempo weld head unit, the s1 main switch(voltage range) position 0/off, 1/15-28v and 2/28-48v, im welding in postion 1/15-28v but have tried in postion 2/28-48v and it either trips the breaker or looks like a blow torch lol, any ideas? Not use to a main voltage select switch, ive a kemppi at home albeit 240v but either on/off, thanks