Matronics Email Lists Forum Index Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Standby Alternator Wiring

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> AeroElectric-List
View previous topic :: View next topic  
Author Message
art(at)zemon.name
Guest





PostPosted: Sun Aug 06, 2017 6:45 pm    Post subject: Standby Alternator Wiring Reply with quote

Folks (esp. Bob),

I want to include a B&C standby alternator system bundle in my plane. I am looking at figure Z-12, which calls for a B&C SB-1 controller. Is the SB1B-14 in the current bundle a straight replacement? Does the bundle come with a diagram to update/replace Z-12?
If I understand Z-12 correctly, I need a switch for the standby alternator on/off. I do not see a switch for the main alternator on/off. What would happen if I were to turn on the standby alternator while the main alternator is operating? Would anything be damaged?
Thanks,
    -- Art Z.

--
https://CheerfulCurmudgeon.com/"If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" Hillel


- 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
Back to top
user9253



Joined: 28 Mar 2008
Posts: 1436
Location: Riley TWP Michigan

PostPosted: Mon Aug 07, 2017 2:56 am    Post subject: Re: Standby Alternator Wiring Reply with quote

The main alternator is switched via one half of the master switch.
Nothing will be damaged if both alternators are both turned on, although voltage regulation might not be stable.


- 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

_________________
Joe Gores
Back to top
View user's profile Send private message
nuckolls.bob(at)aeroelect
Guest





PostPosted: Tue Aug 08, 2017 8:07 am    Post subject: Standby Alternator Wiring Reply with quote

At 05:56 AM 8/7/2017, you wrote:
Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>

The main alternator is switched via one half of the master switch.
Nothing will be damaged if both alternators are both turned on, although voltage regulation might not be stable.

--------
Joe Gores

Running two alternators simultaneously is generally
not a big deal. The alternator with the higher set-point
will 'hog' the load until it's capacity is exceeded.
The bus voltage sags and the alternator with the
lower set point picks up the difference.

Figure Z-12 shows how a second alternator is added
to a single-alternator design. This is done on hundreds
of TC aircraft where the B&C standby alternator is
offered as an option.

The standby alternator is set approx 1.0 volt below
normal bus voltage (0.5v in a 14v system) In flight,
BOTH alternator field switches are ON.

The standby alternator regulator 'sees' what it
perceives is a too-high bus voltage and completely
relaxes . . . s/b alternator field voltage is
reduced to near zero.

If the main alternator shuts down, bus voltage
sags, s/b regulator 'wakes up' and the second
alternator goes to work. The only thing 'magic'
about the s/b alternator is the current sensor
system that annunciates 's/b alternator active'
and assists in load shedding to some value at
or below the alternator's rated output.

But even when the alternators are on line together
and closely adjusted for set point, they're well
behaved.



Bob . . .


- 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
Back to top
ashleysc(at)broadstripe.n
Guest





PostPosted: Tue Aug 08, 2017 8:39 am    Post subject: Standby Alternator Wiring Reply with quote

Hi Bob;
I find your comments very reassuring. I have a low amperage system (day VFR) and have two identical 20 amp internally regulated permanent magnet alternators (dynamos) installed. I have them set up to run independently or in parallel via toggle switches on the panel. I was expecting to try it both ways to see what happens. Still will, but now somewhat more optimistic. Keep up "The Good Work."
Cheers! Stu.
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>
To: aeroelectric-list(at)matronics.com
Sent: Tuesday, August 8, 2017 9:06:34 AM
Subject: Re: Re: Standby Alternator Wiring
At 05:56 AM 8/7/2017, you wrote:
Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>
The main alternator is switched via one half of the master switch.
Nothing will be damaged if both alternators are both turned on, although voltage regulation might not be stable.
--------
Joe Gores

Running two alternators simultaneously is generally
not a big deal. The alternator with the higher set-point
will 'hog' the load until it's capacity is exceeded.
The bus voltage sags and the alternator with the
lower set point picks up the difference.
Figure Z-12 shows how a second alternator is added
to a single-alternator design. This is done on hundreds
of TC aircraft where the B&C standby alternator is
offered as an option.
The standby alternator is set approx 1.0 volt below
normal bus voltage (0.5v in a 14v system) In flight,
BOTH alternator field switches are ON.
The standby alternator regulator 'sees' what it
perceives is a too-high bus voltage and completely
relaxes . . . s/b alternator field voltage is
reduced to near zero.
If the main alternator shuts down, bus voltage
sags, s/b regulator 'wakes up' and the second
alternator goes to work. The only thing 'magic'
about the s/b alternator is the current sensor
system that annunciates 's/b alternator active'
and assists in load shedding to some value at
or below the alternator's rated output.
But even when the alternators are on line together
and closely adjusted for set point, they're well
behaved.


Bob . . .


- 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
Back to top
art(at)zemon.name
Guest





PostPosted: Tue Aug 08, 2017 4:59 pm    Post subject: Standby Alternator Wiring Reply with quote

Bob,

Thanks for explaining. I was going to build Z-12 for my plane but I did not understand why it worked without your explanation.
Cheers,
    -- Art Z.

On Tue, Aug 8, 2017 at 11:06 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
Quote:
 Running two alternators simultaneously is generally
  not a big deal. The alternator with the higher set-point
  will 'hog' the load until it's capacity is exceeded.
  The bus voltage sags and the alternator with the
  lower set point picks up the difference.

   Figure Z-12 shows how a second alternator is added
   to a single-alternator design. This is done on hundreds
   of TC aircraft where the B&C standby alternator is
   offered as an option.

   The standby alternator is set approx 1.0 volt below
   normal bus voltage (0.5v in a 14v system) In flight,
   BOTH alternator field switches are ON.

   The standby alternator regulator 'sees' what it
   perceives is a too-high bus voltage and completely
   relaxes . . . s/b alternator field voltage is
   reduced to near zero.

   If the main alternator shuts down, bus voltage
   sags, s/b regulator 'wakes up' and the second
   alternator goes to work.  The only thing 'magic'
   about the s/b alternator is the current sensor
   system that annunciates 's/b alternator active'
   and assists in load shedding to some value at
   or below the alternator's rated output.

   But even when the alternators are on line together
   and closely adjusted for set point, they're well
   behaved.

--
https://CheerfulCurmudgeon.com/"If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" Hillel


- 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
Back to top
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> AeroElectric-List All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group