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Generators & Electric Motors General Discussion

AC Delco 20kw help


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  #1  
Old 01-15-2008, 01:15:02 AM
Adam Farrow Adam Farrow is offline
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Default AC Delco 20kw help

I have a 2-71 coupled to an AC Delco 20 kw head. How do I change it to single phase? It will run 3 phase or single phase, I just don't know how to wire it up. I also need help with the 2 wire exciter circuit.
Thanks
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  #2  
Old 01-16-2008, 06:49:36 AM
ChrisMar ChrisMar is offline
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Default Re: AC Delco 20kw help

How Many Leads Does Your Generator Have, What is Your Question on 2 Wire Leads, Is Your Gen Brushless, ChrisMar
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Old 01-16-2008, 06:58:45 PM
thom430 thom430 is offline
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Default Re: AC Delco 20kw help

Adam,
You can go to this web site http://www.emerson2-71gm.com/index.html
and check the wiring diagram for distribution. They have a pdf you can download that can give single phase power distribution using all three legs.

I can send you a GM manual but it does not show the configuration of the twelvel leads. I have read that the GM 20kw gen can be wired for different voltages but I have never found a wiring diagram from Delco with that illustration. However, I don't know why a GM Delco twelve lead generator would be different from any other.

My generator (20kw Delco) is wired for three phase with the following config:
4-11-12
3-9
2-8>hot
1-7>hot
5-6-10 neutral
It was being used for single phase in this manor. 3-9 is also a hot and measures about 125 volts under load.

I think this is a low wye config except that my understanding is that the neutral should be 10-11-12 and 4-5-6. I don't know if this makes a difference but mine has been running with the original config for a long time.

If you would like, I can e-mail you a pdf of the Delco Gen. Manual.

Best Regards,
Tom
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Old 01-16-2008, 10:35:44 PM
pegasuspinto pegasuspinto is offline
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Default Re: AC Delco 20kw help

Quote:
Originally Posted by Adam Farrow View Post
I have a 2-71 coupled to an AC Delco 20 kw head. How do I change it to single phase? It will run 3 phase or single phase, I just don't know how to wire it up. I also need help with the 2 wire exciter circuit.
Thanks
is this a RR reefer set? if so, it's 4 wire, but it will hook right up to any 120-240 1 phase box without any modifications

Rob
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Old 01-16-2008, 11:30:22 PM
Jim Rankin Jim Rankin is offline
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Default Re: AC Delco 20kw help

Tom,
It may be that the 4-11-12 wye is also connected to neutral (or ground if your neutral is grounded at the generator), just not in an obvious way.
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Old 01-17-2008, 02:41:07 AM
Adam Farrow Adam Farrow is offline
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Default Re: AC Delco 20kw help

The 20KW seems to be a 4 wire. The 30 KW is a 12 wire. With all 4 leads disconected from any load and just the 2 exciter wires hooked up the generator loads down hard and starts smoking when it hits 1200 rpm. When the exciter is not connected it produces about 2 volts and the motor runs at 1200 rpm with no smoke from the windings or loading. I checked all leads to ground and found no problems. I think that the stator may be bad. What tests can I do? Tomorrow I will fire the 30 KW and hopefully will have beter luck. All gen sets are in a 104' converted yacht. http://www.kodakgallery.com/ShareLandingSignin.jsp?Uc=jej4zip.9ocf1a8p&Uy=-bl9nw4&Upost_signin=Slideshow.jsp%3Fmode%3Dfromsha re&Ux=0
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Old 01-17-2008, 09:28:07 AM
Gunny Gunny is offline
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Default Re: AC Delco 20kw help

Adam:

Smoke? Not good. Smoke from the windings or the exhaust stack, or both? As it is in a marine enviroment, I'd megger the stator windings, very possible to have a shorted winding. Take off the back cover and shine a light in there. If you have a problem with the windings, you can usually see it, look like someone had a BBQ in there. If it is a 12 lead, good chance that someone has made an error in configuring it, 4 lead, doubtful. Are you sure it is a 4 lead? Look to where the wires come out of the stator windings, not further on. Be sure to unhook everything from the windings, voltage regulator, metering, etc or they will be destroyed when you megger test it. Stators are relatively easy to rewind, if it needs it. A good electric motor shop should be able to do that for you, easy. If it needs rewinding, good time to change it to a 12 lead if thats what you want.
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Old 01-18-2008, 03:21:05 AM
Adam Farrow Adam Farrow is offline
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Default Re: AC Delco 20kw help

Smoke was from the windings. Not good! I will take the cover off tomorrow and see whats cooking. So far I can't see where the wires originate from but will look farther. I am also trying to get the other generator going, it is a 30kw 3-71. I installed one injector and in the prosses of replacing the main battery cables then I will fire it up. It is a 12 wire, can't read the numbers but there are 4 wires connected together, and 3 sets of 2 wires connected together. The output is 3 wires, 2 hots and one common. Suggesting 240V single phase. Next weeks project.
Thanks again for the help.
Adam
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Old 01-18-2008, 06:33:29 PM
ChrisMar ChrisMar is offline
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Default Re: AC Delco 20kw help

Adam, Be Careful, Your Gen is Wired Three Phase, All Three Wires are Hot, I Have Connection Diagram for Single Phase Connection, ChrisMar
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Old 01-18-2008, 06:45:50 PM
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Talking Re: AC Delco 20kw help

Adam, Chris is right.... You seem to not have 12 (twelve) Wires here but 10 (ten),
so your deduction on what you have is likely WRONG. It sounds more like you have
a 10 wire Genset wired in 3 Phase Y with just 2 Phases and a Neutral brought out,
for 120/208 Vac. That will work, but it isn't 120/240 Single Phase, and will not give
you 100% of the DataPlate Rating, for output.
__________________
Bruce in alaska
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Old 01-20-2008, 03:18:58 AM
Adam Farrow Adam Farrow is offline
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Default Re: AC Delco 20kw help

I will be on the boat tomorrow to check. My memory isn't great but I thought for sure there was 12 wires, I will recount and get back to you.
Thanks again
Adam
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Old 01-22-2008, 02:54:12 AM
Adam Farrow Adam Farrow is offline
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Default Re: AC Delco 20kw help

It's alive! The 30KW was a 12 wire and single phase. It is running perfectly. I want to put an emergency kill on it for low oil pressure and over heat. I want to use an airflow shut off type so it can be used incase of over rev. Any ideas on where to get one or how to make one? The engine is a 3-71. If it is easy I will put one on the 2-71 20 KW when I get it running.
Thanks for all the help.
Adam
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Old 01-22-2008, 09:00:01 AM
Jim Rankin Jim Rankin is offline
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Default Re: AC Delco 20kw help

Congratulations!

You may be able to purchase a used generator end for your 2-71 set since there were thousands of those made as railroad "reefer" units and they are being refurbished and resold to the public by resellers.

What you need for the safties should already be installed on any generator set, but if not, you should be able go get everything from a Detroit Diesel dealer or aftermarket. You would probably have to get the air door from them at any rate.

The systems I have seen had a time delay relay on the oil pressure to allow starting the engine without having to hold a bypass button. If oil pressure didn't come up in time/or was lost later, the kill solenoid pulled the latch on the air door. The over temperature switch was instantaneous (no allowance for starting while over temperature)
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Old 07-05-2009, 06:28:51 PM
guyfour guyfour is offline
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Default Re: AC Delco 20kw help

I need that delco manual, I have a 12.5 KW Delco I have been looking for a service manual/ wiring schematic. My email is guyfour@bellsouth.net many thanks !
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Old 07-14-2009, 03:38:58 PM
vampire13 vampire13 is offline
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Default AC Delco 20kw help

in dominican republic is a guy that sales hundred of these 2/71 engines complete with gen end and chassis ..jus as the where removed from the rail wagons...just type 2/71 or 2-71 in googles and closo to it it will appear.....he buys in the US...so look for the supplier. Ragards....
Ahh...best gen set ever made......bit loud as all 2cycle DD but you cant damge them except running tem with no water or no oil...but that is a different story...

Adam's Post "It's alive! The 30KW was a 12 wire and single phase. It is running perfectly. I want to put an emergency kill on it for low oil pressure and over heat. I want to use an airflow shut off type so it can be used incase of over rev. Any ideas on where to get one or how to make one? The engine is a 3-71. If it is easy I will put one on the 2-71 20 KW when I get it running.
Thanks for all the help.
Adam"

Use Nason sensing units and syncrostart solenoids,,,,will do a grat job as protection device...
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