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peteohms
Joined: 31 Oct 2007
Posts: 224
Location: Leander, TX
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 Posted: Tue May 05, 2009 4:52 pm Post subject: 912ULS integrated alternator question |
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Yup Noel, I'm a ham. I got the capacitor the size of a beer can from an old
power supply in my junk box. Bought the 50# power supply at a ham auction
for $0.50 and have stored it for 15 years just to use one part on my Kitfox.
Anyone need a 30# 8 Volt transformer?
Pete
Hell Paso TX moving to Austin
Kitfox III
912
Grove
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Pete
Leander, TX
Kitfox III, 912ul, Grove |
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Tue May 05, 2009 5:40 pm Post subject: 912ULS integrated alternator question |
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30# 8V... no but it would make a decent anchor
VO1 PL
Noel
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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grahamsingleton(at)btinte
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| Posted: Tue May 05, 2009 11:18 pm Post subject: 912ULS integrated alternator question |
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Pete Christensen wrote:
| Quote: |
<apeterchristensen(at)sbcglobal.net>
Yup Noel, I'm a ham. I got the capacitor the size of a beer can from
an old power supply in my junk box. Bought the 50# power supply at a
ham auction for $0.50 and have stored it for 15 years just to use one
part on my Kitfox.
Anyone need a 30# 8 Volt transformer?
Pete
Hell Paso TX moving to Austin
Kitfox III
912
Grove
Pete
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don't electrolytics degrade if not used for a long time?
Graham
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Wed May 06, 2009 2:42 pm Post subject: Re: 912ULS integrated alternator question |
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| peteohms wrote: | Yup Noel, I'm a ham. I got the capacitor the size of a beer can from an old
power supply in my junk box. Bought the 50# power supply at a ham auction
for $0.50 and have stored it for 15 years just to use one part on my Kitfox.
Anyone need a 30# 8 Volt transformer?
Pete
Hell Paso TX moving to Austin
Kitfox III
912
Grove
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For what it's worth, since I started this thread  :
- got new R/R in from lockwood yesterday, everything charges fine now with no problems.
- I'm also a ham
- I lived in Austin TX for 20 years too.
Thanks for all the help folks,
LS
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LS
Titan II SS |
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peteohms
Joined: 31 Oct 2007
Posts: 224
Location: Leander, TX
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| Posted: Wed May 06, 2009 3:09 pm Post subject: 912ULS integrated alternator question |
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Graham,
If it lost 1/2 of it's capacitance it would still have plenty. 57,000 mF
Pete
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Pete
Leander, TX
Kitfox III, 912ul, Grove |
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grahamsingleton(at)btinte
Guest
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| Posted: Wed May 06, 2009 4:00 pm Post subject: 912ULS integrated alternator question |
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Pete Christensen wrote:
| Quote: |
<apeterchristensen(at)sbcglobal.net>
Graham,
If it lost 1/2 of it's capacitance it would still have plenty. 57,000 mF
Pete
Pete
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do they ever go open circuit or even short circuit? I'm not an expert in
these things, just try and remember
Graham
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peteohms
Joined: 31 Oct 2007
Posts: 224
Location: Leander, TX
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| Posted: Wed May 06, 2009 4:34 pm Post subject: 912ULS integrated alternator question |
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Graham,
An old electrolytic can be refreshed by slowly applying voltage and current
over time. Start with a variable dc power supply at a couple volts. Watch
the amps and work up to full voltage rating. As I recall it takes 5 minutes
plus 1 minute for every month the cap has set. My Kitfox III did not have a
capacitor on it and the rectifier regulator lasted 400+ hours. I have not
actually fired up the new cap but will do the refresh before I do.
Pete
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Pete
Leander, TX
Kitfox III, 912ul, Grove |
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grahamsingleton(at)btinte
Guest
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| Posted: Thu May 07, 2009 4:48 am Post subject: 912ULS integrated alternator question |
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Pete Christensen wrote:
| Quote: |
<apeterchristensen(at)sbcglobal.net>
Graham,
An old electrolytic can be refreshed by slowly applying voltage and
current over time. Start with a variable dc power supply at a couple
volts. Watch the amps and work up to full voltage rating. As I recall
it takes 5 minutes plus 1 minute for every month the cap has set. My
Kitfox III did not have a capacitor on it and the rectifier regulator
lasted 400+ hours. I have not actually fired up the new cap but will
do the refresh before I do.
Pete
thanks for that Pete
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Graham
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dashwood
Joined: 24 Jan 2009
Posts: 73
Location: sw ontario canada
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| Posted: Mon Feb 07, 2011 5:56 pm Post subject: Re: 912ULS integrated alternator question |
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Last time up i had a low voltage warning light show on the ems. low end threshold of 12v. it seemed to only appear when i keyed the radio mic and / or cycled the elec fuel pump on. took me a while to realize the correlation here. from this thread it would seem to be a blown regulator.. i have not had a chance to go in with a volt meter and check for voltage to the reg. the plane was up for almost 2 hrs in this condition. no warning light but for when using radio which is really the only draw other then the ems. seemed to be getting worse to the end of the flight so proly battery was getting down...Q= will engine continue to run with dead battery, assuming the generator fields are working? will engine run without generator but a full battery? i use a photo cell charger to keep battery topped up between flights so always had full charge to start. battery is 2 years old and only fair condition, on schedule to be replaced.
question... am i on the right track... what is the problem with the master/alternator switch off sequence... one first then the other and what happens if wrong one is switche first..?
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Ross Alexander: CH701 driver 912ul 788tt
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