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1. 11:53 AM - Old Electric Auto-Lite Generator (Ryan)
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Subject: | Old Electric Auto-Lite Generator |
Hi all,
Thought it worth a try given that there's quite a knowledge base here.
Has anyone had much to do with Electric Auto-Lite generators. I currently h
ave a generator warning light coming on and associated amp and volt reading
s on the gauge (as well as battery going flat).
It is a 30V 140A generator. It had been working up until recently when the
aircraft was shipped from the US to New Zealand with the batteries disconne
cted.
I have attached a picture of the terminals as they are labelled A B D and E
, D and E have a jumper across them (possibly earth?). Now the awkward thin
g, this generator is fitted to an Allison V12 which in turn is fitted to a
Russian Yakovlev-3 using all Russian ancillary equipment (carbon pile regul
ator, over voltage protection circuits etc etc). There is no other cable to
ground that is obvious other than the generator grounding to the engine.
I have a feeling that the generator is type 'A' with Field to ground extern
ally regulated and have treated it as such up to this point. There is resis
tance across the field winding (or what I think is the field winding (label
led as terminal 'A'??). There is no voltage at the field wire going into th
e generator with master and generator switch on, which leads me to further
think that it is a type 'A' generator.
I have put a jumper on the field and dropped it to earth (bypassing the reg
ulator etc) and run a multimeter on large terminal 'B' and there is a very
small voltage (approx. 0.5V) that does change with RPM to a maximum of appr
ox. 1V at run up RPM.
I'm thinking the generator needs flashing possibly??
Is someone able to assist a little to determine the best way to do this giv
en a lack of total understanding of the labelling of the terminals on the g
enerator. What are the 4 poles? Why is there a jumper across D and E? Am I
correct in thinking it is a type 'A' generator with negative field? Are we
able to give some names to the various terminals and is there a better way
to determine if it is a generator fault or a fault at the regulator end (wh
ich is going to be more difficult to sort given its Russian origins). Does
anyone possibly have an Auto-Lite manual from the 40's?
Any help would be greatly appreciated.
Cheers,
Ryan
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