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Old Electric Auto-Lite Generator

 
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ryansoutham(at)hotmail.co
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PostPosted: Thu Mar 15, 2018 11:53 am    Post subject: Old Electric Auto-Lite Generator Reply with quote

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 have a generator warning light coming on and associated amp and volt readings 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 disconnected.


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 thing, 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 regulator, 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 externally regulated and have treated it as such up to this point. There is resistance across the field winding (or what I think is the field winding (labelled as terminal 'A'??). There is no voltage at the field wire going into the 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 regulator 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 approx. 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 given a lack of total understanding of the labelling of the terminals on the generator. 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 (which 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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user9253



Joined: 28 Mar 2008
Posts: 1278
Location: Riley TWP Michigan

PostPosted: Fri Mar 16, 2018 1:13 am    Post subject: Re: Old Electric Auto-Lite Generator Reply with quote

If it was made in the '40s, it could be a generator, not an alternator. Take resistance measurements and post them. Read this manual:
http://www.wildriders.org/threads/autolite_gen_maintenance.pdf


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Joined: 15 Mar 2011
Posts: 699

PostPosted: Fri Mar 16, 2018 2:14 am    Post subject: Old Electric Auto-Lite Generator Reply with quote

FANTASTIC!
 Joe:
Brings back memories.
Barry
On Fri, Mar 16, 2018 at 5:13 AM, user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:
Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>

If it was made in the '40s, it could be a generator, not an alternator.  Take resistance measurements and post them.  Read this manual:
http://www.wildriders.org/threads/autolite_gen_maintenance.pdf

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Joe Gores




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PostPosted: Fri Mar 16, 2018 3:15 pm    Post subject: Old Electric Auto-Lite Generator Reply with quote

Quote:


I have put a jumper on the field and dropped it to earth (bypassing the regulator 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 approx. 1V at run up RPM.


I'm thinking the generator needs flashing possibly??

Very possible . . . if not probable. If it has
been a long time since the generator was operating,
it's likely to have lost residual field flux.

It's likely that the four terminals are simply
Armature+, Armature-, Field- and Field+
(supply from regulator) . . . the jumpered
terminals would be A- and F-.

Does the ship's maintenance literature speak to
a flashing procedure? Lacking a 'qualified'
procedure, you can rig a current limited jumper
(a 55W automotive headlamp is a cheap limiting
resistor). While the engine is running and generator
switch is ON, use your 'test lamp jumper' to connect
from Bat to Arm on the regulator. This should
put enough current into the generator system to
cause it to excite it into self-sustained operation.

After it comes up, turn on as many ship's
loads as you can like lights, pitot heater, blowers,
etc and bring engine rpm up to fast idle . . . the
generator load meter should show some significant
output.

It only takes a minute or so to 'recharge' the field
such that it should come on line normally the
next time you fire it up.






Bob . . .


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