Originally posted by tarry99
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I've just installed the new resistor and I was told that the brush should not come in contact with the wire on the resistor or it will burn out again. After adjusting the brush so that there is a gap, it will start the arc and be very stable but it will not increase the current. I couldn't turn it around as this was pretty fried. I'm searching for gap details on line as the owners manual is useless. Any help would be appreciated.
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Sometimes you can turn the resistor over and reverse the wires and it will be fine again.......this changes the position of where the arc travel across the resistor was.......Leave a comment:
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Dialarc HF-P 250
Hello and thanks for the addition to the group. Just thought I'd share this and it's most likely been covered before since my welder is a dinosaur but I still love it. Several months now my machine has been acting a bit funny. When I initiate and arc with the foot pedal it starts fine and is stable in both modes, AC DC. However as I increase the current with the pedal nothing happens and then BAM, it jumps up to an increased level. It's been very difficult to control so I end up using the control on the front panel to set my amps. It was getting to the point I was shopping new and used newer model welders. I run a Syncrowave 350 at work and rather like it. Do I like it 7K more than my old Dialarc, not really. I decided to look into repairing my beloved machine and called around and found a local welding repair shop. I explained the symptoms an was told to open up the pedal and examine the resistor inside that the swipe brush glides past. Sure enough, this thing was toast. I called the guy back and told him what I found and sent him the picture of the resistor. He also suggested I clean or replace the points and reset the gap. ****, I'd never done it before but I've maintained our work machine. He has the resistor in stock and is willing to deliver it to me since he'll be in the area on a service call today. It's a 50$ part. I bought this machine new in 1984 and it's only cost me 50 dollars in repairs to this date. Although the wife said I could buy a new welder if I really wanted to. I thought about it but why? I've had this for 33 years and it's only cost me 50 bucks to maintain. I think I'll hang on to the old girl a bit longer. Miller Machines Rock !
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