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MEP 17a -2A042 -Onan 5KW- Resistor value in voltage controller


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  #11  
Old 01-26-2017, 09:03:00 AM
roelant roelant is offline
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Default Re: MEP 17a -2A042 -Onan 5KW- Resistor value in voltage controller

I am now pleased to report to you my progress on gettinge the mep 17a running and delivering power..

While waiting for the sx460 to arrive i went back to the defective mag amp regulator. After removing the fried resistor from its place i found out that the rear side was not completely black and i even managed to read the value! It turned out to be a 1000 ohm resistor.

Then i checked out the zener that is parallel to the resistor ( both together are in series with the field of the generator). It turned out to be bad. It is a 10 watt stud mount 5.6 volt zener. I found a replacement at Farnell and ordered one.

It arrived today. I replaced the resistor ( i happened to have several around of the proper value and wattage since one of my other hobby's is tube guitar amps and they use that value for G3 on a endtube pentode). Then i fixed the zener and installed the regulator.

After startup of the engine of the mep 17 still no power but field flashing solved that last problem!

I adjusted the engine speed to 60 Hz and loaded the genny with a flood light of 150 watt. The voltage seems fairly stable.

I will run the unit on a bit more load later, but feel confident it will be ok.

Oh boy that engine makes a fair bit of noise when running at 3600 rpm.. It would be no fun to have that running all day...It needs a somewhat isolated shed not to close to the house...

Thanks again for supporting remarks and good tips.
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  #12  
Old 01-27-2017, 06:40:53 PM
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Jim McIntyre Jim McIntyre is offline
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Default Re: MEP 17a -2A042 -Onan 5KW- Resistor value in voltage controller

Yes, they are loud. Maybe at 3000 rpm a little better. Aren't you 50 Hz in the Netherlands?
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Old 01-28-2017, 05:08:15 AM
roelant roelant is offline
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Default Re: MEP 17a -2A042 -Onan 5KW- Resistor value in voltage controller

Yes we are... But so far I am only test running this genny. I am not sure how well the avr will work if i lower the RPM's to 3000. Will the increased field current needed for getting the same output voltage at 3000 RPM not overload the voltage regulator or field coil?

This has been a fun project so far. I am not so sure how practical it will be to keep this noisy bugger around. In the netherlands we seldom have power outs and they generally don' last more then an hour or so at max.

Of course if we would have a serious power out it would be great to have this thing around. I could imagine all my nabours running long extention cords to my place just to keep their central heating, freezers etc going...

We could then all stand around 'our' genny and smoke sigars (with ear protection on...)

Actually a more practical use would be if i need to welding on my boat on a remote location..

Another plan i originally had with this generator is to use the generator head as a power brake for power testing small 1 cylinder engines that my son is working with. We have a project going where we have installed an electronic fuel injection on a honda 50 cc engine for a small motorcycle. I want to be able to do bench testing with engines like this and was planning to use the generator head for that.

Of course i now know that this gen head has only one bearing..
I might end up selling it again now that it is running ok and spend the money on an other gen head with two bearings..Or take the spark plugs out and spin the whole engine and gen head driving the crankshaft from the non flywheel side.
I need to figure a way to connect the output shaft of the little honda engine to the crankshaft of the genny in a safe way...

Some more thinking to do , i don't want to spend a lot of money , it all has to be done with old parts or stuff that is allready around.
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Old 01-28-2017, 01:03:18 PM
25Eagle34 25Eagle34 is offline
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Default Re: MEP 17a -2A042 -Onan 5KW- Resistor value in voltage controller

They really like Gas also, so better have a good supply ready
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