Re: Engine Voltage

["Steve" <pracys@eisa.com.au>]

People,
G,BL,DL,82,N classes of loco have a alternator shunt internally within the
altenator at around 45kmh this of course varies depending on the type of
loco.
It happens as follows:
0-45kmh accelerating the altenator is conected in parrallel transition then
occurs and now the alternator makes a series conection to take the loco to
maximum speed.
The loco makes a backward transition at about 42kmh.
This same feature does not exist on the 81 class as it has a larger higher
capacity alternator than the locos prevoiusly mentioned.
The two types of alt are AR11 and AR16.
However having said that all of the types mentioned  are permanent parallel
conections in regards to traction motor configurations.
steve
John MacCallum wrote in message <39D3259A.F5B49518@lisp.com.au>...
>Ron Bennell wrote:
>>
>> The voltage is variable and roughly proportional to engine revs.  I am
not
>> sure of the specifics of an 81, but 2000 volts as a maximum would be
>> reasonable.  For a loco as modern as an 81 it is surprising to me that
they
>> have a series/parallel transition.  I believe that most other Clyde/EMDs
>
>81 class engines do not shunt the field. The Traction motors are in
>Parallel with each other. As was mentioned by someone else but ignored
>by most the Load meter reads the traction current to one traction
>motor therefore times load meter readings by 6.
>Max. continuos Voltage in my Manual is quoted at 1300 volts and max.
>continuos Amperage is 7020 Amps. Rated Power is 2237 kw.
>
>By the way G and BL's are also Parallel Engines as 82 and 90 class.
>
>Engine
>
>--
>
>Pope
>
>Alias John MacCallum