Today's Message Index:
----------------------
1. 11:24 AM - Clarify Z101 (bcone1381)
2. 12:56 PM - Re: Clarify Z101 (Eric Page)
3. 02:03 PM - Re: Clarify Z101 (Charlie England)
4. 02:16 PM - 'Homebuilt' voltage regulator to replace old unsafetied regulators? (Charlie England)
5. 02:24 PM - Re: Clarify Z101 (user9253)
6. 02:59 PM - Re: Clarify Z101 (Eric Page)
7. 04:50 PM - Re: 'Homebuilt' voltage regulator to replace old unsafetied regulators? (Charlie England)
8. 07:23 PM - Re: Clarify Z101 (bcone1381)
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 |
|
1) Clarify for me why the Z101 Alternator Field portion of the Master Switch circuit
that runs from the Main Bus Bolt to the Master Switch circuit calls for
a fusible link between the bus bolt and the 5A CB.
2) Clarify for me how the Aux Feed (Brown Out) bus is used. Is its normal use
limited to pre flight activities? Is it normally off or on during flight? Are
items on the bus like the #1 COMM radio powered normally from the Main Bus
with the AUX Bus power use temporary during start and clearance delivery activities?
3) Does your Electronics International CGR-30P Engine Monitor stay on line during
engine start, or will it reboot?
--------
Brooks Cone
Bearhawk Patrol Kit Build
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=508117#508117
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: Clarify Z101 |
bcone1381 wrote:
> 1) Clarify for me why the Z101 Alternator Field portion of the Master Switch
circuit that runs from the Main Bus Bolt to the Master Switch circuit calls for
a fusible link between the bus bolt and the 5A CB.
The wire from the bolt (probably located next to the battery, either on the firewall
or in the aft cabin area) to the ALT FLD circuit breaker (on the instrument
panel) would otherwise be unprotected against a short to ground. Since fuses
and CBs are not used in series, the fusible link wire provides protection
against a dead short while easily carrying normal field current and being essentially
immune to nuisance trips or vibration effects.
> 2) Clarify for me how the Aux Feed (Brown Out) bus is used. Is its normal use
limited to pre flight activities? Is it normally off or on during flight?
Are items on the bus like the #1 COMM radio powered normally from the Main Bus
with the AUX Bus power use temporary during start and clearance delivery activities?
The AUX BUS/AUX ALT switch is normally off during flight, and the AUX BUS is fed
via the diode bridge (colored pink, labeled "W10," just above and to the right
of the battery contactor). If the BATTERY CONTACTOR fails open, that feed
is lost, so the AUX BUS/AUX ALT switch is moved to the center "AUX BUS" position,
closing the AUX BUS ALTERNATE FEED relay and feeding the AUS BUS from the
fat wire tie point on the hot side of the BATTERY CONTACTOR. If the main alternator
or regulator fails, (as Bob would say, finish your cup of coffee, fold
your newspaper, then...) move the switch to the upper position to close the AUX
BUS alternate feed relay and activate the auxiliary alternator.
The AUX BUS switch can be closed to activate the relay during preflight activities
if needed, then once the MASTER switch is on, turn the AUX BUS switch off.
The AUX BUS will not inherently prevent any susceptible avionics from rebooting
during engine start. That protection must be built in (low minimum input voltage)
or be added via an inline energy storage device (backup battery or capacitor
bank) or via a DC-to-DC boost converter (as shown in green, below the MAIN
POWER DISTRIBUTION BUS).
If the airplane is intended for IFR flight then you'll probably opt for a backup
battery to maintain instrumentation under all circumstances. All other options
that we've considered on the AE-List work only as start-induced-brownout protection.
> 3) Does your Electronics International CGR-30P Engine Monitor stay on line during
engine start, or will it reboot?
It will probably be fine. According to the specifications shown here...
https://iflyei.com/product/cgr-30p-premium/#CGR-30P-Specifications
...the power requirements are 7.5-30V. Something is wrong if your bus voltage
is dropping below 7.5V during start.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=508118#508118
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: Clarify Z101 |
On 10/20/2022 1:23 PM, bcone1381 wrote:
>
> 1) Clarify for me why the Z101 Alternator Field portion of the Master Switch
circuit that runs from the Main Bus Bolt to the Master Switch circuit calls for
a fusible link between the bus bolt and the 5A CB.
>
> 2) Clarify for me how the Aux Feed (Brown Out) bus is used. Is its normal use
limited to pre flight activities? Is it normally off or on during flight?
Are items on the bus like the #1 COMM radio powered normally from the Main Bus
with the AUX Bus power use temporary during start and clearance delivery activities?
>
> 3) Does your Electronics International CGR-30P Engine Monitor stay on line during
engine start, or will it reboot?
>
> --------
> Brooks Cone
> Bearhawk Patrol Kit Build
For #1, it's to protect the wire between the bus and the breaker. The
bus has enough current available to 'light up' the wire; because it's
tied directly to the bus, protection is needed.
Charlie
--
This email has been checked for viruses by Avast antivirus software.
www.avast.com
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: | 'Homebuilt' voltage regulator to replace old unsafetied |
regulators?
Just saw this article about the L9918 alternator regulator from ST
Microelectronics. I'm curious about whether it might be viable as a
replacement for the unprotected regulators still found in some of the
older 'one wire' alternators many of us still use, or perhaps, even for
an externally regulated alternator.
It has a lot of sophisticated features we'd likely never use, but a
quick stroll through the data sheet (link in the article) makes it sound
as if it will function just fine in standalone mode. Five terminal
device, but the 5th terminal is basically a 'comm' terminal, which the
data sheet implies can be lost and the regulator will still function
properly. It does have OV & UV protection built in. At a onesies cost of
<$10, it certainly looks tempting to try.
Charlie
--
This email has been checked for viruses by Avast antivirus software.
www.avast.com
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: Clarify Z101 |
If the battery contactor fails open during flight (unlikely), how will the pilot
know it?
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=508121#508121
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: | Re: Clarify Z101 |
user9253 wrote:
> If the battery contactor fails open during flight (unlikely), how will the pilot
know it?
Haha! Good point, Joe. I was looking at the AUX ALT B lead (connected to the
hot side of the contactor), since that was the switch involved in the OP's question.
Obviously the MAIN ALT will keep everything powered even if the contactor
fails open, and the failure will only be evident once the engine is shut down.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=508122#508122
Message 7
| 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: 'Homebuilt' voltage regulator to replace old unsafetied |
regulators?
On 10/20/2022 4:16 PM, Charlie England wrote:
> <ceengland7@gmail.com>
>
> Just saw this article about the L9918 alternator regulator from ST
> Microelectronics. I'm curious about whether it might be viable as a
> replacement for the unprotected regulators still found in some of the
> older 'one wire' alternators many of us still use, or perhaps, even
> for an externally regulated alternator.
>
> It has a lot of sophisticated features we'd likely never use, but a
> quick stroll through the data sheet (link in the article) makes it
> sound as if it will function just fine in standalone mode. Five
> terminal device, but the 5th terminal is basically a 'comm' terminal,
> which the data sheet implies can be lost and the regulator will still
> function properly. It does have OV & UV protection built in. At a
> onesies cost of <$10, it certainly looks tempting to try.
>
> Charlie
>
Well shucks. For some reason, the link didn't 'take'. Here's the full link:
https://www.electronicdesign.com/markets/automotive/article/21252965/electronic-design-automotivealternator-regulator-embeds-advanced-functionality-lin-interface?utm_source=EG+ED+Analog+%26+Power+Source&utm_medium=email&utm_campaign=CPS221013058&o_eid=0371F5910123I6U&rdx.ident[pull]=omeda|0371F5910123I6U&oly_enc_id=0371F5910123I6U
--
This email has been checked for viruses by Avast antivirus software.
www.avast.com
Message 8
| 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: Clarify Z101 |
I am building a Bearhawk Patrol...similar to a Husky or Supercub. Its VFR, with
merely a Garmin G5, Engine Monitoring System, Surefly ignition, and Bendix Mechanical
FI.
I have done my load analysis, drawn most schematics for individual circuits and
now am selecting the parts of Z101 that will make up my electrical system. I'm
keeping this simple. I will be satisfied with a Main bus and Battery Bus and
will not install the CD/Aux/BO bus components.
I request help deciding whether to include the Engine Bus.
Each Ignition demands only 1.4A. I will install a 16ah battery, 40A main alternator,
and SD-8 Aux Alt. The Surefly ignition manual says to wire the ignition
module directly to the battery terminal. It seems prudent to me to connect
the second ignition wire to the BATT side of the Battery Contractor. The aux fuel
pump will be on the main bus.
Does this seem logical? Building the Engine bus components seems more suited for
a complex higher load installation.
But I fear leaving out these four extra components of the engine bus architecture
will compromise the system, but I cant see how without multiple failure modes.
What am I missing?
--------
Brooks Cone
Bearhawk Patrol Kit Build
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=508124#508124
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! --
|