Originally Posted by
Commander_Keen
Some machines I've worked with will only operate on a 'remote' control (foot pedal or torch rotary control) as a percentage of the current set at machine.
So if you machine is at 50% of the machine's max output, then the remote will only give up to that value (ie 50% of 200A = 100A, remote gives 0A-100A roughly). I say roughly because if it's a potentiometer based adjustment pots can have resistance variance, so may be more or less.
Or as others have said, RTFM.