Today's Message Index:
----------------------
1. 04:37 AM - Re: Re: Z101 with Rotax 915iS (Matthew S. Whiting)
2. 05:19 AM - Re: Z-11 ground avionics bus question (johnbright)
3. 06:32 AM - Re: Re: Z101 with Rotax 915iS (Ken Ryan)
4. 07:40 AM - Re: Re: Surplus Wire (Robert L. Nuckolls, III)
5. 08:04 AM - Re: Surplus Wire (BMC_Dave)
6. 06:27 PM - Altitude encoder output voltages (Finn Lassen)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Z101 with Rotax 915iS |
What emergency power switch? I see no such reference in the 915iS installation
manual. I looked at HIC A and B and X3 and I see no such switch terminals.
X3-1 allows external power to be used in the event that both generator A and B
fail together, but I see no emergency power switch.
> On Jun 18, 2020, at 3:36 AM, Ken Ryan <keninalaska@gmail.com> wrote:
>
>
> If Gen A fails, the ECU will disconnect Gen B from the charging system (battery)
and connect it to essential engine loads. Rotax does not want you to do it,
but if you then close the Emergency Power switch, Gen B will also be re-connected
to the charging system. In this condition, it would be possible to load
the generator to the point where voltage drops to a level where the essential
engine equipment fails. Because Rotax does not publish how much current the engine
requires, it is difficult to determine what is safely available for running
non-engine equipment.
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Z-11 ground avionics bus question |
n13en71(at)gmail.com wrote:
> I hope the answer to this question is not too obvious;
>
>
> On Z-11 (and others), the connection between the instrument panel ground bus
and the avionics ground bus is designated 5X20AWG. What exactly does that mean?
> Do I take up 5 tabs on my ground buses with 20 ga wires?Thanks,
> Ben
> Glastar
Hi Ben,
Have you seen Figure 18-17 in the Aeroelectric Connection Book? (and the accompanying
text) Note that in Figure 18-17, "(Instrument) Panel Ground Bus" means
forest of tabs aft side of firewall in the case of a tractor and in the cabin
in the case of a pusher. The term "Panel Ground Bus" has been changed to "Firewall
Ground Bus") on newer dwgs like Z101.
--------
John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
https://drive.google.com/drive/folders/1u6GeZo6pmBWsKykLNVQMvu4o1VEVyP4K
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=496907#496907
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Z101 with Rotax 915iS |
In the latest Installation Manual it is referred to as "Battery Backup
Switch."
On Thu, Jun 18, 2020 at 3:41 AM Matthew S. Whiting <m.whiting@frontier.com>
wrote:
> m.whiting@frontier.com>
>
>
> What emergency power switch? I see no such reference in the 915iS
> installation manual. I looked at HIC A and B and X3 and I see no such
> switch terminals. X3-1 allows external power to be used in the event tha
t
> both generator A and B fail together, but I see no emergency power switch
.
>
>
> > On Jun 18, 2020, at 3:36 AM, Ken Ryan <keninalaska@gmail.com> wrote:
> >
> > =EF=BB
> > If Gen A fails, the ECU will disconnect Gen B from the charging system
> (battery) and connect it to essential engine loads. Rotax does not want y
ou
> to do it, but if you then close the Emergency Power switch, Gen B will al
so
> be re-connected to the charging system. In this condition, it would be
> possible to load the generator to the point where voltage drops to a leve
l
> where the essential engine equipment fails. Because Rotax does not publis
h
> how much current the engine requires, it is difficult to determine what i
s
> safely available for running non-engine equipment.
>
>
===========
===========
===========
===========
===========
>
>
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Surplus Wire |
At 09:55 PM 6/17/2020, you wrote:
>
>Looking at the BMS13-48 spec the flat shield is tin coated copper,
>0.0015" +-.0004 thk and 0.020" wide. I counted 16 strands in the
>braid I disassembled.
>
>So 0.02"x.0011"x16 is 0.000352 sqin area, which is between 13-14ga
>(13.6, apparently). So that's what, 20ish Amps conservatively?
>
>So the 5x 24ga conductors, slightly de-rated to 10A, seems the
>shield would be more than up to it.
Not sure about your numbers. 14AWG solid wire is .065" diam. 3.14 x
(.065/2)^2 = 0.0033 sq"
so I think your shield cross section compared to 14 AWG is off by a
factor of 10?
24AWG is .02" diameter for a cross section of 3.14 x (.02/2)^2 =
0.000314 sq" x 5 strands
is a total of 0.00157 sq". Working backwards I get a diameter of
0.0447 which is
pretty close to 17AWG wire for equivalent resistance of the bundled strands.
I get 0.00048 sq" total cross section for the shield which works back to a
0.0247" diameter wire - just a tad smaller than 22AWG.
Keep in mind also that when the shield is a power path for
currents in central conductors, temperature rise is promoted
by BOTH current pathways under a single jacket.
I've used shields as return paths for countless, low
power or signal pathways but I'd have to think long
and carefully about pushing that combination of
conductor/insulation to its thermal limits.
What application are you considering where you find an
advantage in using the shield for this wire as a power-path?
Bob . . .
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Surplus Wire |
Yeah I got my zeros mixed up there. The shield is equivalent to a single 24ga wire,
so that kills the idea. Thanks.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=496913#496913
Message 6
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Altitude encoder output voltages |
I want to make a serial to graycode converter to replace the AK350 for
input to Garmin GTX 320A transponder.
I'd rather have the altitude come from the Dynon D-10A than the AK350 --
no discrepancy between what ATC sees and what I see on the Dynon (at
29.92 alt setting).
I found the table on
http://www.aeroelectric.com/articles/Altitude_Encoding/modecascii.txt
I intend to use an Arduino Nano or similar.
But my memory is real vague on the polarity and voltage levels.
Is it correct that the encoder has open-collector outputs and the
transponder pull-up resistors to system voltage?
Does the transponder expect inverted inputs (0 in table no input and 1
in table pulling input to ground)?
Finn
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|