Is this set up for multi fuel????? or are you switching the fuel sources?
If the generator is multi fuel it will have two input gas lines one for LP and one for NG. If you are just putting gas to the one inley pipe IE single fuel it won't work. In naturalg as there is approx 1000btus of energy cu/ft in LPV there is 2513 almost twice as much. As such if a generator is not truly duel fuel, when it is set up for LP a small orfice to restrict the LPV gas flow is installed in the fuel mixer / carb. If you try and run on NG it won't get enough fuel, this orfice can be taken out and it should run fine.
SOURCE: 10kw Generac Guardian not cranking, shows rpm sense loss
Sounds like Generator mode switch should be "ON".
SOURCE: LPG / NG portable generator runs on propane but
While propane and natural are similar, some devices require changes to properly operate on the selected fuel.
Information about this should be in the owners manual for the unit.
An off the cuff guess is that the gas pressure from the NG source isn't high enough, or that there is a gas regulatior on the generator that would need to be adjusted for NG.
SOURCE: my 3.5 kw kohler marine
Check that when you run it, it is not in fact making correct voltage (within about 10% is good), also make sure the engine is coming up to full speed, 3600 or 1800. You could check this with a multimeter that measure hertz. On the main output leads when the genset is running make sure it is getting close to 60 hz. or if you are in an area that uses 50 hz. check for that respectively. There are a couple things that would affect this, one would be your SCR module. There is a test procedure for this which you could find here. http://www.scribd.com/doc/50171916/tp6196-1 . I don't work on marine units, mostly standby so these manuals are for residential. Check your fuses, could even go as far as checking the wiring in the back and wiring and condition of the brushes and sliprings. These actually build field voltage to make 240 or 120 volts whatever your unit is configured to make. The brushes need to sit flat on the slip rings and on a unit with 10 hrs. the sliprings I can't imagine would be very dirty but check that as well. If you have an ADC2100 controller use this manual to go into the controller to verify that it is set for the correct voltage that the machine is built to make. The only other fairly simple thing to check that I've had issues with is if Kohler mounted a fuse block on the side of the cabinet mounted to the genset with no vibration isolation. Check these fuses while attempting to run the unit and make sure you getting steady voltage out of them as sometimes they will vibrate causing pulsed voltage to come out of them and can give you an intermittent UU, UF, or OC fault (undervoltage, underfrequency, overcrank).
SOURCE: I have Kohler 12Res generator,sometimes
If it has a couple hundred hours or more, try cleaning the slips rings on the back of the rotor shaft. They should be very shiny and not black or polished looking.
SOURCE: I have a Kohler 12RESM1 propane generator with oc/uu code
U need to make sure that the relay driving ur auto start stay closed all thru the crank cycle.
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No, it is not with multi Fuel, I have only one source which is NG, I just tested LP to see if generator gets start or not, it worked, but I need to add more that I started the generator on NG also, it is working fine but one thing is weird, I have to block and cover the air filter totally, by some paper so that natural air can not go in, then generator works fine without any problem, if I will not block the air filter then it will not start at all. This time Generator is in working but with total blocked and covered filter with paper sheet around. Please help me, how I can make it run on normal way without blocking the filter?
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