rkharr
Joined: 10 Jan 2006
Posts: 12
Location: Columbia, SC
|
 Posted: Wed Apr 08, 2009 11:00 am Post subject: My SD-8 Experience |
 |
|
This is empirical data with a sample of one. It is not a statement of what is true or fact. The experience of others may be entirely different.
A little over a year ago my airplane, an RV-6, was grounded for a month while I tried to make the self-excitation circuit work with my installed SD-8 standby alternator. I was not successful. The self excitation circuit, wired according to Z-25, would trip its overvoltage circuit. I experimented with different size capacitors and resistors to no avail. I was tired of not flying so I gave up and went back to my previous setup (see the attached circuit diagram). Except for this period of experimentation, the standby alternator circuit on my plane (configured per the attachment) has worked reliably for six years and 800 hours. It is a modification of Z-13 that allows the standby system to be completely independent of the main bus and battery system (in order to avoid a single point of failure). If the engine is running the standby system will provide power. The only negative to this configuration is that it requires a small (0.8 AH) battery. The battery is the size of a deck of cards, weighs less than a pound, costs about $25 and is commonly available at the local battery store (Power Patrol SLA 1000; Power Sonic PS-1208WL; or Universal Power Group UB 1208). I change the battery at three year intervals. I hope someone will find this helpful.
| | - 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 |
|
| Description: |
|
Download |
| Filename: |
Standby Alternator Circuit.pdf |
| Filesize: |
26.56 KB |
| Downloaded: |
430 Time(s) |
_________________
Ken
RV-6
South Carolina |
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
