Today's Message Index:
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1. 08:47 AM - Alternator Conversion to External Regulator. (MikeDunlop)
2. 09:12 AM - Alternator woes. (Linda Walker)
Message 1
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| Subject: | Alternator Conversion to External Regulator. |
I'm in the process of following Bob's advice and am about to convert a Nippondenso
alternator to external regulator. After a lot of searching and research I've
come across the following two methods.
I need some advice and input before I start (measure twice, cut once!)
1. http://www.aeroelectric.com/articles/Alternators/One-Wire_Alternator_Conversion.pdf
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2. http://homepages.paradise.net.nz/georger/Alternator.htm
In this article it states:
Before we start we need to know one piece of important information about your charging
circuit.
There are two main types of alternators and we need to know which type you need.
The types are known as Type A and Type B. The difference being where the regulator
fits in relation to the alternator.
In type A circuits the layout is in the order of:
BUS(+ve) - then - Alternator field - then - Regulator - then - Earth.
Therefore the regulator controls the earth feed to the Alternator field.
In type B circuits the layout is in the order of:
BUS(+ve) - then - Regulator - then - Alternator field - then - Earth.
Therefore the regulator controls the voltage feed to the Alternator field
Basically it is a matter of polarity. Simple but VITALLY important. So before reading
the rest.. Find out what you need !!
I think Z-13/8 is a type B circuit... Please correct me if I'm wrong.
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My understanding of both articles:
1. http://www.aeroelectric.com/articles/Alternators/One-Wire_Alternator_Conversion.pdf
a) Modification of the main alternator housing i.e remove copper attachment and
the plastic nut retaining pocket. Then drill/tap the casing for the new attachment.
b) Modify the regulator.
2. http://homepages.paradise.net.nz/georger/Alternator.htm.
a) Modify the regulator.
b) Then the brushes need a small modification.
My assumptions are:
In the event of having to replace an alternator sometime in the future it would
be easier with number 2. (Alternator.htm) because you could use the existing
modified regulator housing and just carry out the small modification on the brushes.
I think Z-13/8 is a type B circuit... Please correct me if I'm wrong.
Any thoughts or experiences on the above?
Regards
MikeD (UK)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=426077#426077
Message 2
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| Subject: | Alternator woes. |
Bob.=0AIf you could please comment on the following:=0A=0AAllowing for a 0.
7-0.9 volt drop across the diode from main to endurance bus, I am measuring
varying voltages on the endurance bus in flight.=0AWhat should be 13.5-13.
7v to allow for the battery to be charged at 14.4v, I am finding voltages t
hat vary from 12.2v to 13.5v at constant cruise rpm.=0A=0AAny idea for trou
bleshooting what is causing the voltage to vary so much?=0A=0A=0AChecking t
he voltage on the main bus, but now on the ground, I am seeing voltages tha
t vary with engine rpm, 550 rpm at idle to 2200rpm, of 14.06v to 14.22v res
pectively.=0A=0AIs this variance within tolerances of the LR3C regulator? I
had expected that the regulator would keep the voltage within a tighter ra
nge.=0A=0AAs an aside, I am experiencing a strange anomoly that sometimes w
hen I transmit the transponder turns itself off. Both are Garmin products,
GNS530 and GTX330, and are powered from the endurance bus. =0A=0AComments i
nvited please.=0A=0AIt is unfortunate that these woes come and go and I'd r
eally like to cure them once and for all.=0A=0A=0AAircraft is- Long-EZ us
ing an "all electric airplane on a budget" architecture, with all B and C e
quipment, 60A alternator, SD-8 dynamo and 32AH battery.=0A=0AMany thanks.
=0APatrick Elliott.=0AG-LGEZ=0A=0A=0A=0A=0A________________________________
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