Today's Message Index:
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1. 01:14 PM - Possible OV condition with Z 16 diagram ? (owner-aeroelectric-list-server@matronics.com)
2. 04:44 PM - Re: KMD 150 (larry)
3. 05:04 PM - gascolator (KahnSG@aol.com)
4. 11:13 PM - Re: single ground question (CardinalNSB@aol.com)
Message 1
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| Subject: | Possible OV condition with Z 16 diagram ? |
--> AeroElectric-List message posted by:
Hi Bob and all,
The completion of our four seater is not far now, and the time will come for
the first start up.
We have a Rotax 914 wired as per fig Z 16 with dual battery. Some fellow
builders have already flown their own projects, and have been aware of a
possible snag with the OV wiring and the Rotax regulator as well as the
Schicke GR4 regulator. They have been experiencing alarming OV conditions on
shutdown.
Scenario :
According to fig Z 16 the regulator "sense" wire (C wire) is connected to
the bus through the S700-2-10 master switch. When one opens the master or
the OV module fires, the sense wire sees zero volt.
The regulator then throws the full alternator output at the capacitor
through the wires B and R. The capacitor is rated for 25 volts and could
suffer from the 60-100 volts.
The scenario is quite similar with the Schicke regulator.
To prevent this condition one could connect the sense wire (C wire) directly
to the capacitor, and not to the master switch. Thus the regulator always
sees a load and no ill effect is produced when the master is opened.
What is your opinion about this variation on the Z 16 theme ? Doable, not
doable ?
Thank you,
Regards,
Gilles Thesee
Grenoble, France
Message 2
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--> AeroElectric-List message posted by: larry <larry@grrok.com>
Why not use a 12 vdc battery in your system between the power supply and
the KMD 150.
At 10:04 PM 7/23/2004, you wrote:
>--> AeroElectric-List message posted by: "Mickey Billings" <mbilli@cox.net>
>
>Does anyone know if I can use a fair DC power supply in the airplane to
>power my KMD 150 GPS without damaging the GPS in order to spend some time
>learning some of it's features? The power supply I have is 12v DC with no
>other adjustments. I am however willing to purchase another unit if necessary.
>
>Many Thanks
>
>Mickey Billings RV&
>
>
Message 3
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--> AeroElectric-List message posted by: KahnSG@aol.com
I'm working on an experimental plane that has the gascolator between the
Weldon high pressure electric pump and the mechanical fuel pump. It has a PS5C
pressure carb.
I always have seen the gascolator on the low pressure (suction) side of the
fuel pumps.
Has anyone seen this type of setup for a pressure carb?
Is it correct?
Any comments?
Steve
Message 4
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| Subject: | Re: single ground question |
--> AeroElectric-List message posted by: CardinalNSB@aol.com
I think that I understand that a single ground for the avionics and
electrical instruments is best.
Does the cabin and instrument lighting need the signel ground also?
I remember a comment by Bob that it would be best to run the bus avionics
directly to the battery, as a sort of electronic shock absorber. Assuming that
it is impossible to run the positive bus lead directly to the battery, would
there be any point in running just the negative lead directly to the
battery? I think my ai will sign this off as a minor mod, since "its only the
ground"....
Thank you for your thoughts. Skip Simpson
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