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Generators & Electric Motors General Discussion

US Motor Div Generator Conversion To Single Phase 220V From Three Phase


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Old 06-25-2010, 11:20:48 AM
jimybud jimybud is offline
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Default US Motor Div Generator Conversion To Single Phase 220V From Three Phase

I have reviewed some of the other posts regarding this topic. One thing I was not sure of is that my zig zag number sequence is standard. In another thread it said as follows:

T3 and T9 together, T6, T12, T8, and T2 together, T11, T5, T4, and T10 together, and T1 & T7 together. My six generator windings (12 leads) are number sequencially. for example, one leg is numbered 1,2,3,4 for two zig zags.

The current ouput leads are L1, L2, L3and LN.

The generator is dated about 1973 abd us a US Motors Division and I believe the model number is S30D18. It is driven by a four cylinder white diesel engine.

The caption of the diagram reads as follows:
Wiring diagram 277/480 volts 3 phase 4 wire or 480 volts 3 phase 3 wire generator & controls also 330/380 volt. Note: omit loadlead "ln" for 480 volt 3 phase 3 wire service.

Below is the wiring diagram. Any help would be appreciated.

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Old 06-25-2010, 06:28:28 PM
armandh armandh is offline
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Default Re: US Motor Div Generator Conversion To Single Phase 220V From Three Phase

each of the 6 windings is normally 138 volt so a lot of work on the voltage regulation system will be needed as well, possibly a new one, unless it has connections for running at the lower voltage
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Old 06-25-2010, 09:25:26 PM
Jim Rankin Jim Rankin is offline
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Default Re: US Motor Div Generator Conversion To Single Phase 220V From Three Phase

If the actual generator leads are numbered like the diagram,

Connect L1 to 1&3, L2 to 9&11, Neutral to 2,4,6 & 8 and splice 5, 7,10 & 12 together and insulate. Maintain the regulator/sensing connections to 3,7 & N.
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Old 06-27-2010, 07:02:22 PM
jimybud jimybud is offline
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Default Re: US Motor Div Generator Conversion To Single Phase 220V From Three Phase

I finally got a chance to inspect the physical wires.

There are seven "leads" as follows (the numbers preceeded by a pound sign is for the 12 brown "thick wires" that appear to come directly from the generator, [but I am not sure without removing a few panels]):

T1 #1 (with Doughnut) (No color tape)
T2 #2 (with Doughnut) (Red Color tape)
T3 #3 (with doughnut) (Blue Color Tape)
N #12, # 10, #11
? #8, #5
? #9, #6
? #7, #4

Any additional information would be appreciated. Again, I am sure this was hooked up as three phase, but I am in need of single phase.
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Old 06-27-2010, 08:19:50 PM
Jim Rankin Jim Rankin is offline
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Default Re: US Motor Div Generator Conversion To Single Phase 220V From Three Phase

Ok, disregard the print you posted and my previous response!

Use the standard reconnection diagrams here


You need to be certain where the sensing and exciter power leads are connected BEFORE you remove any connections. It might be possible to make it work reconnected or not. You will have to make certain the sensing leads are getting similar voltage after reconnection. If it won't work after reconnection, you can always get a transformer and use it as is.

A transformer will not balance a single phase load evenly on the 3 phases, but you can get the voltage you want out of it. Either a single phase 480:208-120 3phase or a 480:240-120 single phase would do it.
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