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Onan NHDFB 1M spec M


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  #1  
Old 08-19-2017, 01:11:48 PM
KPack KPack is offline
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Default Onan NHDFB 1M spec M

Starting a thread on this parts machine I have. I'm going to send the battery charge regulator Vr2 to Lenk so he can study it. Also this unit is a 120/240 unit maybe y'all can look at the wiring diagram and see what the difference is than the 120 units that some say can be reconnected for 120/240. There is a stator under the flywheel that has two wires going to the regulator.
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Last edited by KPack; 08-19-2017 at 01:24:22 PM.
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Old 08-19-2017, 01:15:28 PM
KPack KPack is offline
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Default Re: Nhdfb 1M spec M

More pictures. Maybe someone could pull the build sheet to get the right wiring diagram.

Last edited by KPack; 08-19-2017 at 01:38:34 PM.
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Old 08-19-2017, 01:29:19 PM
Kevin K Kevin K is online now
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Default Re: Nhdfb 1M spec M

My database does not show a build sheet for that model, just a wiring diagram. The diagram shows a "PMG" supplying the charging current. possibly that is the stator under the flywheel?
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Old 08-19-2017, 01:40:44 PM
KPack KPack is offline
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Default Re: Nhdfb 1M spec M

Trying to figure out why my pictures are coming out sideways from my iPhone I don't have a pc anymore.
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Old 08-19-2017, 01:47:39 PM
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Default Re: Nhdfb 1M spec M

I'll try again.
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Old 08-19-2017, 01:58:56 PM
len k len k is offline
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Default Re: Nhdfb 1M spec M

PMG = permanent magnet generator, Magnatite had that on his NHD

It's just windings under the flywheel, and there's (permanent) magnets attached to flywheel that swing by winding poles inducing an AC voltage into them. Little similar to lawn mowers with spark magnetoes.

The DC reg both rectifies that AC and controls how much of it goes to the bat for charging.

PMG should be similar to this pic of same on a NH, that Johnny C posted today in another tread.

.

Last edited by len k; 08-19-2017 at 02:13:03 PM.
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Old 08-19-2017, 02:11:15 PM
KPack KPack is offline
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Default Re: Nhdfb 1M spec M

Some more pictures.
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Old 08-19-2017, 02:13:30 PM
len k len k is offline
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Default Re: Nhdfb 1M spec M

Kpack......Hopefully reg will turn out to not be a shunt type reg. If it's not a shunt type it has potential to be a cheap reg we can all use instead of fixed resistor charging.

Looks like both the NH and your NHD have 18 coils in the PMG.
With 18 poles and spinning at 1800 rpm I think that makes it 270 hz, out the PMG. Not really important just interesting.

Should be able to modify NHD from 120 only output to 120/240, since most of these larger KW gens have two 120V main windings in genhead. In past I believe I saw NHD service manual even show a re-connection diagram.

Last edited by len k; 08-19-2017 at 02:25:20 PM.
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Old 08-19-2017, 02:24:32 PM
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Default Re: Nhdfb 1M spec M

Would that be called a solenoid under the starter that's where the wires from the charger go then over to the control box.
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Old 08-19-2017, 02:51:24 PM
len k len k is offline
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Default Re: Nhdfb 1M spec M

Yes , Looks like there is a starter solenoid under the starter.

I would say the wires from windings under flywheel go to DC voltage reg. Then it's DC output goes to the fat always live bat terminal on starter solenoid.

Quote:
Originally Posted by KPack View Post
Starting a thread on this parts machine I have. I'm going to send the battery charge regulator Vr2 to Lenk so he can study it. Also this unit is a 120/240 unit maybe y'all can look at the wiring diagram and see what the difference is than the 120 units that some say can be reconnected for 120/240. There is a stator under the flywheel that has two wires going to the regulator.
Looking at NHD service manual 965-0500 schematic on paper page 99, looks like genhead stator does not have B windings, ( since it has PMG under flywheel). On my similar 7NHM the stator B winding leads are white with light blue tracer

Last edited by len k; 08-19-2017 at 02:53:32 PM. Reason: added B-winding color info
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