pto generator speed question - help : Tractor Implements  -- Tractor Attachments Implements 3ph Discussion Forum and Review pto generator speed question - help : Tractor Implements -- Tractor Attachments Implements 3ph Discussion Forum

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 03-04-2009, 02:04 Post: 160775
FarmCarpentr



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 pto generator speed question - help

I am looking at a 50kw pto generator that I can use with my tractor.

If the pto idle on my tractor sometimes goes really slow and I am just using the generator to run a backup (pre-heating) water heater for the buildings, would that hurt anything in the generator? Would the generator burn up or something?

The water pre-heater is DC. I can convert the AC from the generator to DC and pre-heat the water for my large water heater, so any electric (volts or amps) that the generator puts out is fine for it. There is nothing wrong with the tractor, this is just a condition of what I am using it for etc. The size of the tractor is not an issue. What else I am using it for is not an issue. I am just interested in what effect running the generator really really slow has on the generator itself. The generator is rated at 1800 rpm.

Thank you.






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 03-04-2009, 05:20 Post: 160776
harvey



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 pto generator speed question - help

Unless you are running a large operation a 50KW is way overkill. You will need a 100hp tractor to operate it at full power.

That said a 20 hp tractor will run that generator if you only need 10KW or less.

You will have to run the generator at rated rpm at all times in order to get the 240 or 110 volts at 60 hertz. You can not run it less or you will damage your appliances similiar to brown out conditions.






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 03-04-2009, 09:18 Post: 160777
FarmCarpentr



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 pto generator speed question - help

"I am just interested in what effect running the generator really really slow has on the generator itself."






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 03-04-2009, 09:36 Post: 160778
kwschumm



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 pto generator speed question - help

It probably depends on the generator. If the generator has any sort of filtering/conditioning electronics on the output side it could damage them by running components out of spec.






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 03-04-2009, 09:55 Post: 160779
Murf



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 pto generator speed question - help

First off, unless you have a free tractor and free diesel fuel, what the heck, let's throw in a free replacement for for the tractor and genset for when they die, this is about the least efficient way I can think of to even just pre-heat water.

Off the cuff, I'd say it would probably more efficient to either run a loop and use the engine coolant directly, or run the exhaust out through the water.

Aside from all of that, yes, loading a tractor up at low speeds is not a good idea, and the genset will burn up in reasonably short order too.

Every genset I've ever seen is cooled by means of a fan on the armature. If you run it at just above idle speed, you asking it to work full out with minimal air flow for cooling.

Best of luck.






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 03-04-2009, 12:34 Post: 160784
FarmCarpentr



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 pto generator speed question - help

Filtering or conditioning electronics: I am now looking into that for removal of them.

When I am running the generated electric through a bridge rectifier for resultant DC electric, then I do not need all that stabilization of the volts and Hz.

Thank you.






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 03-04-2009, 12:46 Post: 160785
FarmCarpentr



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 pto generator speed question - help

I did not say a genset. You personally added that and then argued against your own personal addition.

I did not say that I was loading any tractor up at low speeds. You personally added that also and then cursed me for burning up the non-existent genset that in your imagination you personally added.

A pto generator is not a genset nor a generator set: It has neither motor nor engine to drive it. The engine is different in that it is what the pto generator is attached to. If you know tractors, you know that there exists a variety of pto drives including direct to engine, or clutched, or slip clutched, or hydraulic, etc. The engine of the tractor can run at a variety of speeds, all of which you seem to assume much about.

It is a simple question. Your arrogance of telling me off for asking it is something you will have to deal with on your own time.






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 03-04-2009, 12:53 Post: 160786
AnnBrush



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 pto generator speed question - help

Now you have 4 replies - It's not a good idea. The genset is rated to operate continuously at 540rpm or thereabouts. Idling it will not help prolong the life of the genset and as Murf pointed out will likely shorten it. In addition to some mechanical and heat concerns electrical components may stress due to altered sine wave patterns generated by a slower turning armature. These stresses would be present regardless of the load's ability to use the altered power wave form. Its quite possible that at slower speed the sine wave developed is actually a square wave. This wave form has documented problem causing effects in electronic devices rated to perform on properly controlled sine wave power.

The use of the term genset in place of "PTO generator" in this case is irrelevant, I think all the people who so kindly replied to your post appreciate that point.






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 03-04-2009, 12:57 Post: 160787
Murf



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 pto generator speed question - help

Ok, I'm not exactly sure where any of that came with, but good luck with your personal issues.

A "genset" is a generic term for anything that makes electricity, it is a common abbreviation for "generator setup" and is used to refer to BOTH engine/generator sets AND PTO (or other forms of drive) types of generating equipment.

BTW, re-read my post, I neither 'told you off' nor 'cursed' you.

Best of luck.






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 03-04-2009, 13:07 Post: 160788
FarmCarpentr



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 pto generator speed question - help

Thank you for pointing out that definition of a genset. I shall accept it.

4 replies is "not a good idea"? How can that be when asking a question? Does not the clarification of concepts apply to asking a group a question?

My question was and is:






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