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Legend NT no 60Hz generator output.

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  • duaneb55
    replied
    email sent.

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  • duaneb55
    replied
    cruizer described the more common Miller idler circuit that energizes the throttle solenoid to bring the unit to low idle rather than the Legend's that energizes to increase to weld speed.

    I'd post up the Circuit Diagram 184 759-A for your unit that shows what I've described but it's too large to upload.

    PM me an email address and I'll send it to you and you can see for yourself.


    CR2 should energize 10-15 seconds after any weld load is removed and the unit returns to low idle/power speed. If the relay cover is clear enough to see thru, you should be able to see the relay contacts change state when/if it energizes properly. CR2 de-energizes at weld speed to disconnect auxiliary power output from the outlets because of the excessive frequency at that speed. You could also disconnect the contact leads and check for continuity when/if the relay energizes as it should.

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  • fireslayer
    replied
    Thanks duane55. Seems to be some conflict on info here, but I think we can get it figured out. Seems Cruizer says that CR1 should energize when the IDLE Lock switch is on, but you say it prevents it from energizing. I know there are 4 wires on the IDLE LOCK switch so I assumed it had 2 different functions.I also did have the FINE rheostat set to 100% as in the directions when testing for 60 Hz auxiliary output. How can I visually tell if CR2 is energizing? Should I see an arc inside of it and what do I need to do to activate it off and on for verification? Also, is there a more complete schematic available besides the one in the owners manual as it doesn't seem to have all the circuits and components on it? Thanks again fellas.

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  • duaneb55
    replied
    The Legend idle system works just the opposite of the typical Miller arrangement in that the throttle solenoid energizes for weld speed and de-energizes for low idle (power) speed.

    The IDLE LOCK switch serves two functions in the lock ON position.
    1) It shorts the output leads of the weld/100Hz outlet load sensing CT1 (Current Transformer) to prevent the idler control board from energizing control relay CR1.
    2) It opens the 12V+ supply circuit to CR3 so it does not energize to close the field voltage rheostat by-pass circuit (thus requiring the rheostat to be manually set to 100 to achieve full wattage capacity of auxiliary power output with idle lock ON).

    CR2 energizes at POWER speed (regardless of position of the IDLE LOCK switch) to connect auxiliary power output to the circuit breakers and on to the outlets. As such, you will need to check to visually see if CR2 is energizing at low idle POWER speed to complete the auxiliary power circuits - again, regardless of position of the IDLE LOCK switch.

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  • cruizer
    replied
    CR1 is not comming on when you flip the switch to idle lock, therefore CR2 & 3 are not activating. Trance this circuit out first....

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  • fireslayer
    replied
    Thanks for your help cruizer. I start the unit up, main switch is in the idle/run position and the unit will run at weld rpms for a short while regardless of which way the idle lock switch is flipped. Once it idles down,(and it always does) it will stay at idle rpms regardless of which way the idle lock switch is flipped. Excuse my ignorance, but how can I tell when the relays come on? I have tried to feel for a click but I'm not sure it could be felt with the vibration of the machine running. I haven't noticed any arc inside of the cr2 or cr3 relays either and I don't know if I should be able to or not. Should the idle lock pull the unit back to idle when the main switch is up in the RUN position also, or does it just function in the idle/run position. The schematic I printed out of the operator's manual seems to leave a lot of the circuits out or something. It appears there's a lot of the wiring and even the idle lock switch isn't shown that I can find anyways. Thanks again for your help.

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  • cruizer
    replied
    OK, so you hit the lock out switch, CR1 comes on, deactivating the throttle pick up, CR2 and CR3 then comes on allowing power to flow to the auxillary terminals. via the voltage regulator. and the local voltage control

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  • fireslayer
    started a topic Legend NT no 60Hz generator output.

    Legend NT no 60Hz generator output.

    Hello, new here and need some help on Miller Legend NT welder/generator Ser. # KJ068685. Unit had starting problem and idle/run speed problems which have been repaired. There were 2 connectors that were broken in the main start/run switch connector which I replaced. The battery is now new also. Part of the connections kept losing connection at the firewall connector, so I replaced them all and this took care of all the run and idle speed functions. Engine has been serviced and tuned with all new filters, oil and spark plugs. Engine starts and runs very well at correct speeds. Unit appears to weld good and 100Hz outlet has power and operates my disc grinder just fine. I do not have much voltage (one half volt or less on any of the 60Hz outlets. All circuit breakers have continuity and all switches are set in the correct positions, idle lock, idle run etc. The slip rings and brushes have been cleaned and appear to have good contact. I have tried to trace out the winding circuits and I find around 100 volts ac on the junction block below the relays, but it doesn't appear that the voltage is getting back over to the outlets. I sure could use some help troubleshooting this thing. There is a Miller dealer in town, but it's kind of a side thing to them and they seem to be more about the electric units than the gas powered units, and they didn't seem to know how to get an in depth tech manual for the units. I found the owners manual and checked the fuse and all that was in the troubleshooting section. I work on a lot of portable generators in my shop and have a decent understanding of electrical principles. I really could use some unit specific troubleshooting info to get the generator part up to speed. I figure it may be a relay or diode but would like to troubleshoot it correctly. I've dug around on here a little and there is great info and help here. I just haven't found any specific info to this unit yet. If it's here or someone can point me in the right direction I would be most appreciative.
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