Originally Posted by dragonsgate
If you lessen the resistance so it only takes a couple of seconds arenít you increasing the inrush and defeating the purpose of the whole project?
The main purpose is to mitigate the 1000A plus inrush arc which occurs with no precharge resistor across the contacts. Using a resistance value which limits that current to 10 or 20A is sufficient. Commercial drives with 330VDC bus use as low as 1Ω precharge. As the resistance decreases, the wattage needs to increase. Adding an additional resistor, or two, or three as I suggested will take care of that.