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I have a Dialarc HF and the control circuitoverloadbreaker trips when i turn the power on. I have it set up to stick weld DC. As the manual indicated there is no heat control when this happens. I have tried to reset but it trips. It will reset with the machine off. Any suggestions?
Reply:small bridge diode is shorted. depending on version. it will be on the center panel or on the center back of the transformer down low. older machines had a orange stack of plates and newer ones have a small plastic block. see the parts diagram for which type is in your machine and where it is located. Some times if the breaker is weak it will trip if the current control is all the way up.
Reply:Thank you it will be a few days but ill try to find it.
Reply:I am having trouble finding the small bridge diode. I think the link is the machine i have. https://www.millerwelds.com/files/ow.../O315U_MIL.pdf However my machine serial number is JB583460.
Reply:
Originally Posted by 4babyfaces
I am having trouble finding the small bridge diode. I think the link is the machine i have. https://www.millerwelds.com/files/ow.../O315U_MIL.pdf However my machine serial number is JB583460.
Reply:
Originally Posted by G-ManBart
It looks like the manual for your serial number is this one:https://www.millerwelds.com/files/ow.../O315H_MIL.pdf
Reply:
Originally Posted by 4babyfaces
ok thanks. I am assuming the part number is 035 914?another question I’m wondering if it may be a problem the spark gap on the HF is really corroded. Could this also be a problem even though I’m not using HF? Should I clclean and reset the spark gap?
Reply:I repaired a non HF Dialarc 250 that was popping the breaker. It was the SR module on the fan mount bulkhead. When it goes bad the circuit breaker pops to protect the MA circuitry. Sent from my iPhone using TapatalkSteveMiller Dialarc 250 (1990)Miller Maxstar 140 STR (2003)Lincoln SA200 Redface Pipeliner (1966)Lincoln MP210 (2015)Victor and MECO torches
Reply:
Originally Posted by ccawgc
small bridge diode is shorted. depending on version. it will be on the center panel or on the center back of the transformer down low. older machines had a orange stack of plates and newer ones have a small plastic block. see the parts diagram for which type is in your machine and where it is located. Some times if the breaker is weak it will trip if the current control is all the way up.
Reply:Than you do you know how to test it?
Originally Posted by Sparkie1957
I repaired a non HF Dialarc 250 that was popping the breaker. It was the SR module on the fan mount bulkhead. When it goes bad the circuit breaker pops to protect the MA circuitry. Sent from my iPhone using Tapatalk
Reply:There are 4 terminals and it checks like a normal diode. Voltage should go one way between terminals. Been awhile so I dont remember exactlySent from my iPhone using TapatalkSteveMiller Dialarc 250 (1990)Miller Maxstar 140 STR (2003)Lincoln SA200 Redface Pipeliner (1966)Lincoln MP210 (2015)Victor and MECO torches
Reply:This might helpTesting a Rectifier With the Diode FunctionIf your multimeter has a diode function, one of the dial settings will have a marking similar to the diode symbol. When you select this setting, a voltage exists between the meter leads, and when you touch them to the diode terminals, the meter records the voltage drop. In the forward direction, the voltage drop is usually in the neighborhood of 0.5 to 0.8 volts. In the reverse direction, no current flows, so the meter either records 0 or OL, which stands for open loop.To conduct the test, you must first make sure the circuit is unplugged and that all capacitors in the circuit have been discharged. As long as you do this, you do not need to remove the diode from the circuit. Start by touching the negative meter lead, which is usually the black one, to the diode's cathode, and the positive lead (red) to the anode. Note the meter reading, which should be between 0.5 and 0.8 volts. If it's close to 0, the diode is bad. Now reverse the leads. The diode is good if you get a reading of 0 or OL. If you get roughly the same voltage reading, the diode has shorted and isn't working.Conducting a Diode Test With an OhmmeterWhen conducting a resistance test, you must remove the diode from the circuit. Before you do this, disconnect power and discharge any capacitors in the circuit. This is especially important when testing a microwave diode because the high voltage capacitor in a microwave can give you a serious shock.Set the multimeter to measure resistance (Ω) and touch the black lead (negative) to the cathode and the red lead (positive) to the anode. In this configuration, the diode is forward-biased, and you should get a resistance reading between 1 KΩ and 10 MΩ. Now switch the leads to the opposite terminals. The diode is now reverse-biased, and the reading should be infinity or OL. If the readings are the same in both directions, the diode is bad.Sent from my iPad using TapatalkSteveMiller Dialarc 250 (1990)Miller Maxstar 140 STR (2003)Lincoln SA200 Redface Pipeliner (1966)Lincoln MP210 (2015)Victor and MECO torches
Reply:Thank you ill give it a go!
Originally Posted by Sparkie1957
This might helpTesting a Rectifier With the Diode FunctionIf your multimeter has a diode function, one of the dial settings will have a marking similar to the diode symbol. When you select this setting, a voltage exists between the meter leads, and when you touch them to the diode terminals, the meter records the voltage drop. In the forward direction, the voltage drop is usually in the neighborhood of 0.5 to 0.8 volts. In the reverse direction, no current flows, so the meter either records 0 or OL, which stands for open loop.To conduct the test, you must first make sure the circuit is unplugged and that all capacitors in the circuit have been discharged. As long as you do this, you do not need to remove the diode from the circuit. Start by touching the negative meter lead, which is usually the black one, to the diode's cathode, and the positive lead (red) to the anode. Note the meter reading, which should be between 0.5 and 0.8 volts. If it's close to 0, the diode is bad. Now reverse the leads. The diode is good if you get a reading of 0 or OL. If you get roughly the same voltage reading, the diode has shorted and isn't working.Conducting a Diode Test With an OhmmeterWhen conducting a resistance test, you must remove the diode from the circuit. Before you do this, disconnect power and discharge any capacitors in the circuit. This is especially important when testing a microwave diode because the high voltage capacitor in a microwave can give you a serious shock.Set the multimeter to measure resistance (Ω) and touch the black lead (negative) to the cathode and the red lead (positive) to the anode. In this configuration, the diode is forward-biased, and you should get a resistance reading between 1 KΩ and 10 MΩ. Now switch the leads to the opposite terminals. The diode is now reverse-biased, and the reading should be infinity or OL. If the readings are the same in both directions, the diode is bad.Sent from my iPad using Tapatalk
Reply:Update on Miller Dialarc HF Control Circuit Overload Breaker. First of all thanks to all who helped. I have been successful in getting the Welding Machine back in working order. After locating and testing the One is listed on page 34 Figure A Main Assembly part Number SR2 035 914 which on my machine is round but the replacement part is square plastic block was the problem. Thanks again to all who helped!!!!
Reply:Glad you got it going. They are great weldersSent from my iPad using TapatalkSteveMiller Dialarc 250 (1990)Miller Maxstar 140 STR (2003)Lincoln SA200 Redface Pipeliner (1966)Lincoln MP210 (2015)Victor and MECO torches |
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发表于 2021-9-1 23:16:56