D311 Electric Set Wiring

I'm no generator expert by any means😉 😉 but here is some info that may be of help.

I'll repeat some of it here, but you probably should just go over to the SmokStak generators and electric motors forum and look at the FAQ under the main section.
http://www.smokstak.com/forum/forumdisplay.php?f=6

If you have 10 leads, you have a Y or "star" ONLY generator. You cannot reconnect for any of the single phase or delta 3 phase connections. This is because there is a Y connection between what would be called T10, T11, T12 if you had a 12 lead generator. This is buried in the generator stator on the lead end where the leads are spliced onto the enameled winding wire ends and then the splices and leads all laced down before the stator is dipped in varnish and baked.

With a 12 lead generator, you can reconnect for most anything from 120 single phase to 277/480 3 phase. You also have to configure the exciter/regulator system to function at the new voltage/phase arrangement. I have dug this buried wye splice out on one that I have, separated the Y, spliced on the 3 leads and relaced and revarnished everything, but I was not able to get the CAT regulator and exciter to function when the set was reconnected to anything other than the high/low 3 phase it was designed for. I could have bought an aftermarket regulator and exciter unit from Power Tronics or others, but the engine on the set began having problems and I haven't gotten back to that project in a few years now.

I would use the set connected Low voltage 3 phase and connect to any 2 lines and the neutral. This will supply 120/208 instead of 120/240, but most things will function properly on this power even if they operate with a little less speed as in the case of electric heating elements, or pull some extra amperage in the case of electric motors. Only occasionally will you have problems with a 230 volt rated electric motor starting on 208 volt single phase. Most times you can work around these situations if you watch for them and don't burn up your motor before you recognize there is a problem.

You are unlikely to damage the generator in any way pulling single phase power off 2 lines unless you exceed the rated amperage on any line. You will be able to do this quite readily since the engine is large enough to drive what is basically 2/3 of the standard generator load it was designed for without even straining much.

There is not a transformer that will improve the single phase capacity of this generator over just using 2 lines. You could use a transformer to go from 208 to 240 either with the whole output or just for a specific motor circuit for instance. If you can adjust the voltage, you can raise it a bit and run 127/220 or even a bit higher without any problem since most anything you might ever use on it is built to accept a 10% over or under voltage without problems.

The connections 4-7, 5-8, 6-9 which you mention indicate that the set is currently configured for high voltage 3 phase (or about 277/480) in a "series wye" connection. Low voltage would be a parallel wye connection with each line connecting to 2 terminals and 3 (really 6 if you count the buried splice) terminals connecting to the neutral. There is a link to connection diagrams on the SmokStak FAQ I mentioned.

Any questions or other information, come on back here unless you want to register over on the other board

I'll repeat some of it here, but you probably should just go over to the SmokStak generators and electric motors forum and look at the FAQ under the main section.
http://www.smokstak.com/forum/forumdisplay.php?f=6

If you have 10 leads, you have a Y or "star" ONLY generator. You cannot reconnect for any of the single phase or delta 3 phase connections. This is because there is a Y connection between what would be called T10, T11, T12 if you had a 12 lead generator. This is buried in the generator stator on the lead end where the leads are spliced onto the enameled winding wire ends and then the splices and leads all laced down before the stator is dipped in varnish and baked.

With a 12 lead generator, you can reconnect for most anything from 120 single phase to 277/480 3 phase. You also have to configure the exciter/regulator system to function at the new voltage/phase arrangement. I have dug this buried wye splice out on one that I have, separated the Y, spliced on the 3 leads and relaced and revarnished everything, but I was not able to get the CAT regulator and exciter to function when the set was reconnected to anything other than the high/low 3 phase it was designed for. I could have bought an aftermarket regulator and exciter unit from Power Tronics or others, but the engine on the set began having problems and I haven't gotten back to that project in a few years now.

I would use the set connected Low voltage 3 phase and connect to any 2 lines and the neutral. This will supply 120/208 instead of 120/240, but most things will function properly on this power even if they operate with a little less speed as in the case of electric heating elements, or pull some extra amperage in the case of electric motors. Only occasionally will you have problems with a 230 volt rated electric motor starting on 208 volt single phase. Most times you can work around these situations if you watch for them and don't burn up your motor before you recognize there is a problem.

You are unlikely to damage the generator in any way pulling single phase power off 2 lines unless you exceed the rated amperage on any line. You will be able to do this quite readily since the engine is large enough to drive what is basically 2/3 of the standard generator load it was designed for without even straining much.

There is not a transformer that will improve the single phase capacity of this generator over just using 2 lines. You could use a transformer to go from 208 to 240 either with the whole output or just for a specific motor circuit for instance. If you can adjust the voltage, you can raise it a bit and run 127/220 or even a bit higher without any problem since most anything you might ever use on it is built to accept a 10% over or under voltage without problems.

The connections 4-7, 5-8, 6-9 which you mention indicate that the set is currently configured for high voltage 3 phase (or about 277/480) in a "series wye" connection. Low voltage would be a parallel wye connection with each line connecting to 2 terminals and 3 (really 6 if you count the buried splice) terminals connecting to the neutral. There is a link to connection diagrams on the SmokStak FAQ I mentioned.

Any questions or other information, come on back here unless you want to register over on the other board