Fred Klein
Joined: 26 Mar 2012
Posts: 503
|
 Posted: Sat Oct 19, 2013 9:15 pm Post subject: EXP Bus workaround |
 |
|
Bob...I'm not sure what you're up to, but I have been looking at the implications of some variations under these givens; namely, that:
- Batteries aft, wired together...act as one battery
- Bat Contactors aft...ALL buses forward on either side of firewall to be determined
- EXBus serves as Main Power Distribution Bus
- Endurance Bus has alternate feed from Engine Bus
ALTERNATIVE # 2
- EXP Master Switch fed thru Contactor #1
- Starter fed from Contactor #1 and EXP Bus
- Engine Bus fed thru Contactor #2
CRITICAL IMPLICATIONS:
- If Master switch is OFF, starter cannot be energized
- If Contactor #2 fails, engine will not run
- If Bat #2 switch is turned OFF unintentionally, engine will NOT run
- Long feeder from aft contactor to Engine Bus is NOT always hot and is protected by contactor
ALTERNATIVE # 3
- EXP Master Switch fed thru Contactor #1
- Starter fed from Contactor #2 and Engine Bus
- Engine Bus fed thru Contactor #2
CRITICAL IMPLICATIONS:
- If Master Switch is OFF, starter can still be energized thru Contactor #2
- If Contactor #2 fails, engine will not run
- If Bat #2 switch is turned OFF unintentially, engine will NOT run
- Long feeder from aft contactor to Engine Bus is NOT always hot and is protected by contactor
ALTERNATIVE #4
- EXP Master Switch fed thru Contactor #1
- Starter fed from Contactor #2
- Engine Bus fed direct from Battery
CRITICAL IMPLICATIONS:
- If Master Switch is OFF, starter can still be energized thru Contactor #2
- If Contactor #2 fails engine will continue to run
- If Bat #2 switch is turned OFF unintentionally, engine will continue to run
- Long feeder from aft (Battery side of) contactor #2 is ALWAYS HOT and unprotected by CB or fuse
I'm just tryin to eat the elephant one bite at a time...in doing so, I tend to favor Alternative #4 if risk of ALWAYS HOT feed to engine bus is sufficiently mitigated w/ a non-conductive airframe and possibly other considerations.
Fred
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
