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Thread: Seeking TMs and Advice on Nordic ECU Install

  1. #11
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    Quote Originally Posted by smokem joe View Post
    Actually this picture of the hookup looks wrong to me. I haven't investigated the wiring on these, but I'm guessing that green wire should go to ground and not neutral. I don't think there is anything in these that requires 120v to need a neutral, but I'm sure it needs a ground!
    On larger gensets, ground and neutral are bonded. The wiring pictured is correct. Green always goes to L0. I chose 30 amp breakers in my circuit panel because the individual breakers on this unit are 30 amp. I have 4 of these units.
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    For Sale: [1986 M996 HMMWV] [2001 M1123 HMMWV]

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  3. #12
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    If the gen set is tied into a panel as mine are they should be unbonded. The bond should only be in one place. If the gen set is set up as prime power in the middle of a field and not connected to a panel then then bonded is correct.

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  5. #13
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    I went out and checked mine, did continuity test. I wired in a 5 wire pigtail and 30 amp 208 3 phase plug, wired according to mfg spec for the plug.
    The cable for the ECU only has 4 wires, and the 4th wire at the ECU end checked out as ground for me.

    That being said, on the generator side of things the neutral and ground are tied together on my gen, and also in the picture above. Bonding bar is to the vertical piece of metal to the right of the neutral lug at the bottom corner of the picture. Doesn't really make any difference at that point.

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  7. #14
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    Quote Originally Posted by hrbergeron View Post
    On larger gensets, ground and neutral are bonded. The wiring pictured is correct. Green always goes to L0. I chose 30 amp breakers in my circuit panel because the individual breakers on this unit are 30 amp. I have 4 of these units.
    L0 is the same as Neutral, right?


    I can't find a single wiring chart after multiple searches that puts a green wire as anything other than ground (or green-yellow as protective earth in Europe, but same basic meaning). I'm still looking, but I can't find them.

    Now, I can understand if you're using wires designed for single phase 240 wiring in a 3 phase application as to why you would have green as neutral and no ground wire, but a proper 3 phase cable should have 5 wires in it to allow for both neutral and ground to be utilized.

    9dd36c841b4e2402111f9c9b3e88c589.jpg

  8. #15
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    Green always signifies ground. That is universal in North America.

    The reason a lot of 240v wiring has no neutral is it isn't needed. The only reason to have the neutral is if the device requires 120v somewhere inside of it. All of your old 240v stoves and clothes dryers were only 3 wire. Usually this was just 2 hots and a bare ground for safety, unless a clock or control panel used 120v. Then they would use a protected neutral, and on some of the really old stuff it was still carried on the open ground. On a typical 240v single phase device the two hot wires exchange from positive to negative 60 times a second, or 60HZ. The ground was there to catch the current in the event of a problem.

    Code has changed now. All 240v devices now come with a neutral and a ground and all new wiring is 4 wire.

    The reason your ECU is testing green as ground is because that is what it is. There is no neutral needed. 3 phase is 3 hot wires spaced on 1/3 of the cycle. That being said if the ground bar is up as shown in the gen set picture it will work because ground and neutral are tied. If it was mine I would be hooking the green to ground as a matter of principal. If you are hardwiring one to a panel with separate equipment ground and neutral bars then you better get the green to the equipment ground bar!

    The military didn't have to follow code changes as it doesn't apply to them. So to make a 3 phase device with no 120v draw in it and require a 5 wire is a waste of soldiers time to hook up and our money (not that they care about wasting money) to buy the cable as it simply isn't needed. 4 wire cable will always be cheaper than 5 and faster to hook up. I have seen plenty of military surplus set up for 3 phase with a 5 prong plug. However the 5th pin is usually vacant on the inside of the device and the power cord will only have 4 wires.

  9. #16
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    Capture.PNG
    At the top is the hook-up for the ECU. Sorry for not loading the manufacturers manual that's shipped with it, single parent with a teenager. I'll start working on scanning it in my computer, printers bad but scanner is good. I have a manual but the one that I was able to obtain online, you can not read any of the wire labels.
    will get it to you all as soon as possible.
    Last edited by Walnut6; 10-03-2019 at 13:55.

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