Today's Message Index:
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0. 08:20 AM - Make Sure You're Listed! List of Contributors Coming Soon! (Matt Dralle)
1. 05:50 PM - Re: alternator / generator (Richard Girard)
2. 08:22 PM - Re: Voltage regulator recommendation? (user9253)
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| Subject: | Make Sure You're Listed! List of Contributors Coming |
Soon!
Dear Listers,
There's just a few more days left in this year's List Fund Raiser and that means
the List of Contributors (LOC) is just around the corner! In December I post
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Message 1
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| Subject: | Re: alternator / generator |
Ken, I don't know how far along you are in crafting your airplane's
electrical architecture, but may I suggest you use Bob's Figure Z-16 that
is designed for the 912/914. It is a more capable architecture than the
Z-17 that I have used twice with Rotax 582 powered airplanes and with which
I have been very satisfied. it is crafted to accomplish what you are asking
about by using a contactor to control the alternator. In addition, by
using an S700-2-10 On-On-On switch you get the effect of a master switch
and have a battery only mode for system testing (or to run on but locking
out the starter) and a run mode that actuates the starter. I also
appreciate that it does away with a bulky key switch to control the mags
and starter by using a push button for the starter and SPST toggle switches
to control the "mags". This is particularly handy when you wish to crank
the engine over with the ignition off and top plugs out to charge the oil
system before first engine start (Rotax ignition modules do not tolerate
being fired while the plugs are not grounded. All the current is forced
through one little diode that promptly burns up, cannot be replaced, and
the cost of two new ignition modules is about $2500 plus installation. Not
a mistake you want to make). Well, those are just a few of my reasons for
recommending the Z-16. There are others on here who have used it and can
chime in.
Rick
On Tue, Nov 25, 2014 at 12:20 AM, Ken Ryan <keninalaska@gmail.com> wrote:
> Rick, It's the wiring diagram from the Installation Manual for the 914.
>
> On Mon, Nov 24, 2014 at 7:08 PM, Richard Girard <aslsa.rng@gmail.com>
> wrote:
>
>> Ken, I've been off the forum for a few weeks and just saw your request
>> for info on the Rotax alternator (dynamo). Can you quote chapter and verse
>> of the manual you are referencing?
>> One of my custormers has a 912 in a JA Highlander that was down for
>> months fixing a long list of defects found during the annual conditional
>> inspection and the battery started the engine just fine when we were done.
>> The 582 on my Kolb has the same basic alternator. I did a major rebuild on
>> the airplane and it was down for over 18 months. The engine started right
>> up when I took it out and that was with a five year old 18 AH SLA battery.
>>
>> Rick Girard
>>
>> On Wed, Nov 12, 2014 at 12:47 PM, Ken Ryan <keninalaska@gmail.com> wrote:
>>
>>> Thanks Bob,
>>>
>>> I was wondering about that 80 amp fuse. It seems better to connect the
>>> bus directly to the battery. With regards to the 1 amp fuse that you say is
>>> unnecessary, why do you say that? Isn't it there to protect the wire that
>>> runs from the battery to relay 58? I think the reasoning behind wiring one
>>> fuel pump to the generator, is because the 914 relies on an electric fuel
>>> pump, and they are trying to provide two independent power sources for each
>>> pump.
>>>
>>> On Wed, Nov 12, 2014 at 9:18 AM, Robert L. Nuckolls, III <
>>> nuckolls.bob@aeroelectric.com> wrote:
>>>
>>>> At 11:01 2014-11-12, you wrote:
>>>>
>>>> Thanks Bob. I do have the book. I am building a Just Aircraft
>>>> SuperSTOL. A previous lister said that the IG wire from the external
>>>> alternator needs to be disconnected to avoid drawing down the battery,
>>>> which it is on the Rotax diagram (via the master switch). Are you saying
>>>> that you disagree with this and that the IG wired does not need to be
>>>> disconnected to avoid drawing down the battery?
>>>>
>>>>
>>>> Ooops . . . sorry 'bout that. We're talking about the wound-field
>>>> alternator . . . not the PM machine. That light doesn't work with
>>>> much more
>>>> intelligence than that annunciator on the PM rectifier/regulator.
>>>> It's definitely dark when the alternator is working but may
>>>> not light when the alternator is inadequate to system
>>>> needs. I don't use those outputs either.
>>>>
>>>> If you're planning on ACTIVE NOTIFICATION OF LOW VOLTS then
>>>> you can simply leave the light off the panel and leave the
>>>> terminal disconnected.
>>>>
>>>> But you're correct, when wired per the Rotax drawing, IG gets
>>>> disconnected when the big-alternator switch is OFF . . . so if
>>>> you plan to use the light, wired as shown eliminates the
>>>> concern.
>>>>
>>>> An interesting feature of their wiring gives you no control
>>>> over the little alternator . . . it is automatically switched
>>>> ON via relay (58) with an unnecessary, 1A fuse in the coil
>>>> lead. This relay closes as soon as you turn on the master
>>>> switch and will stay closed as long as the engine is running
>>>> even if battery relay (38) is opened. Bringing engine
>>>> rpm down will slowly drop voltage on the bus . . . and
>>>> might cause the little-alternator relay to drop but
>>>> this raises all kinds of questions about the behaviors
>>>> of the ship's accessories.
>>>>
>>>> The relay will certainly drop after the engine is shut
>>>> down.
>>>>
>>>> Another interesting feature uses the little-alternator
>>>> output to power up one of two fuel pumps whether or not
>>>> the master switch is ON.
>>>>
>>>> The 80A breaker is, in US TC aircraft philosophy, not
>>>> necessary or useful.
>>>>
>>>>
>>>> [image: Emacs!]
>>>>
>>>>
>>>> Bob . . .
>>>>
>>>
>>>
>>
>>
>> --
>>
>>
>> Believe those who are seeking the truth, doubt those who find it.
>> -Andre Gide
>>
>>
>
--
Believe those who are seeking the truth, doubt those who find it.
-Andre Gide
Message 2
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| Subject: | Re: Voltage regulator recommendation? |
I think that it would be a worthwhile text to measure the voltage between the regulator
"S" terminal and the regulator case to see if it agrees with the electrical
system voltmeter. If the two voltages are different, then there could
be a high resistance connection in the regulator circuit.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=434698#434698
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