RE: Re: (ET) charging circuit

["Elie, Larry (L.D.)" <lelie ford com>]

Your cap must have been shorted; an open will go to a high voltage.

The voltages I quoted were with a 'good' battery pack, loaded.

Larry Elie


-----Original Message-----
From: JAKrug EBAerospaceAndDefense com
[mailto:JAKrug EBAerospaceAndDefense com]
Sent: Thursday, February 05, 2004 12:43 PM
To: elec-trak cosmos phy tufts edu; Elie, Larry (L.D.); roden ald net
Subject: RE: Re: (ET) charging circuit


Hello Larry,
Had a bad cap and my charger would not work at all.
Checked the cap with an RCL meter at work.
I can not remember if it was open or shorted.
I was able to charge when I put the new cap in.
Perhaps I have another problem with my charger.
When you say max. voltage after days, are you talking about the battery
voltage or the unloaded charger output?

My C185 has 1 year old batteries and had the charger problem. ( may
still)
I have an E15 with ??old batteries and it chargers up much quicker then
the new batteries.
What voltage should I be charging my batteries to?
I was under the impression that the voltage was brought up to the low
40s for equalization and they would normally drift back to 38 or 39 with
out use.
I have a lot to learn about these tractors.
Thanks
Jeff

Sincerely,
Jeffrey A. Krug
Test Engineer I
The Ensign-Bickford Aerospace & Defense Co.
640 Hopmeadow Street                      
P.O. Box 429
Simsbury, CT 06070
Phone: 860-843-2072
Fax: 860-843-2069
E-Mail: jakrug EBA-D com
Pager 860-802-4153 numeric


-----Original Message-----
From: lelie [mailto:lelie ford com]
Sent: Thursday, February 05, 2004 9:55 AM
To: Krug, Jeffrey A.; elec-trak; roden
Cc: lelie
Subject: RE: Re: (ET) charging circuit


It DOES work with a bad cap; just not very well.  Max voltage when the
cap is bad will be about 39.5V, after days.  That's 
something like a half charge.  If you disconnect the cap (electric tape
on the taps please) you can go back to 45+V BUT at 
a slower rate.  The failure mode seems to be a leaky (electrically) cap.

Larry Elie


-----Original Message-----
From: JAKrug EBAerospaceAndDefense com
[mailto:JAKrug EBAerospaceAndDefense com]
Sent: Thursday, February 05, 2004 7:07 AM
To: elec-trak cosmos phy tufts edu; roden ald net
Subject: RE: Re: (ET) charging circuit


 Hello All,
I was under the impression that the transformer in the elec-trak is a
Ferroresonant Transformer.
To hold the voltage constant.
Does anyone have a link to a site the explains how this thing works? (in
simple terms.)
I am at loss in understanding why the transformer will not work when the
capacitor dies.

Thanks
Jeff

Sincerely,
Jeffrey A. Krug
Test Engineer I
The Ensign-Bickford Aerospace & Defense Co.
640 Hopmeadow Street                      
P.O. Box 429
Simsbury, CT 06070
Phone: 860-843-2072
Fax: 860-843-2069
E-Mail: jakrug EBA-D com
Pager 860-802-4153 numeric


-----Original Message-----
From: roden [mailto:roden ald net]
Sent: Friday, January 30, 2004 1:26 PM
To: elec-trak
Cc: roden
Subject: Re: (ET) charging circuit


On 29 Jan 2004 at 19:49, gmbauman alltel net wrote:

> filtered by a
> capacitor.

That's not a filter capacitor.  It connects to a separate winding on the

transformer, and helps it hold a constant voltage.  I don't really
understand 
how it works, but apparently it's not really a resonant circuit -
something 
about keeping the transformer core saturated?  Sorry, best I can do.
But it's 
definitely not a filter.


David Roden - Akron, Ohio, USA
1991 Solectria Force 144vac
1991 Ford Escort Green/EV 128vdc
1970 GE Elec-trak E15 36vdc
1974 Avco New Idea 36vdc
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