Howdy,
I have a Hypertherm PowerMax 1000 which needs a 50:1 voltage divider. I built one using the typical resistor circuit, but the plasma cutter refuses to fire when using it. I tried three different circuits with resistances ranging from 5 kohms to 1 Mohm and no luck on any of them. I can read the voltage fine from a DVM while the unit is cutting, and I know the resistor circuits work by using a different power supply. But..... the arc refuses to transfer when the resistors are there. Do I need a diode, capacitor, or filter to make this work? I thought this circuit would be a piece of cake, but apparently its not as obvious as I thought. Any help would be great. Thanks