nuckolls.bob(at)cox.net
Guest
|
 Posted: Sun Jul 06, 2008 7:19 am Post subject: PM Alternator & S704-1 Relay |
 |
|
At 05:21 AM 7/6/2008 -0700, you wrote:
| Quote: |
Hi,
I'm just wiring up my S704-1 alternator disconnect relay for my Jab, but
the 2 documents I have contradict the + & - cable connections. On the B&C
site S704-1_tips.jpg shows them with the negative next to the COM
connection, whereas their power distribution diagram for some other
alternators shows them reversed, with the +tive next to the COM
connection. Can someone please confirm for me which way it should be for
my Z-20 scheme.
|
Relays with no built in coil suppression technology are NOT
polarity sensitive. The reason you've detected this variability
in how wires are connected to the various terminals of the
spdt, S704-1 relay is a good example of this fact. You can
wire per any of the diagrams you've cited and the relay
will perform as advertised.
| Quote: | Also, in the S704-1_tips.jpg image there is an IN5400 diode between the +
& - terminals. This diode didn't come with the kit of bits I bought from
B&C, so do I need to install this as well or not?
|
The 1N5400 is pretty "hoggy" in this case. Suggest the
smaller 1N4000 to 1N4007 device installed as shown in
http://aeroelectric.com/Pictures/Relays/s704inst.jpg
Now, once that diode is installed, the INSTALLATION
becomes polarity sensitive . . . The banded end of
the diode connects to one of the coil terminals that
must now be the (+) supply to the coil.
| Quote: | You can probably tell from my recent posts that I'm currently doing the
firewall forward wiring of my plane, so your input is much appreciated at
this, somewhat testing, time for a non-electrical guy!
As always, thanks in advance for your time.
|
No problem . . . that's what we're here for.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
| | - 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
