Matronics Email Lists :: View topic - Standby Alternator Wiring

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Standby Alternator Wiring

Matronics Email Lists Forum Index -> AeroElectric-List

View previous topic :: View next topic

Author Message

art(at)zemon.name
Guest

Posted: Sun Aug 06, 2017 6:45 pm Post subject: Standby Alternator Wiring

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 theÂ 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,

Â  Â  -- 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

user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Mon Aug 07, 2017 2:56 am Post subject: Re: Standby Alternator Wiring

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

nuckolls.bob(at)aeroelect
Guest

Posted: Tue Aug 08, 2017 8:07 am Post subject: 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

ashleysc(at)broadstripe.n
Guest

Posted: Tue Aug 08, 2017 8:39 am Post subject: Standby Alternator Wiring

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

art(at)zemon.name
Guest

Posted: Tue Aug 08, 2017 4:59 pm Post subject: Standby Alternator Wiring

Bob,



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

Cheers,

Â  Â  -- 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: 	
		   Â Running two alternators simultaneously is generally

 Â  not a big deal. The alternator with the higher set-point

 Â  will 'hog' the load until it's capacity is exceeded.

 Â  The bus voltage sags and the alternator with the

 Â  lower set point picks up the difference.



 Â Â  Figure Z-12 shows how a second alternator is added

 Â Â  to a single-alternator design. This is done on hundreds

 Â Â  of TC aircraft where the B&C standby alternator is

 Â Â  offered as an option.



 Â Â  The standby alternator is set approx 1.0 volt below

 Â Â  normal bus voltage (0.5v in a 14v system) In flight,

 Â Â  BOTH alternator field switches are ON.



 Â Â  The standby alternator regulator 'sees' what it

 Â Â  perceives is a too-high bus voltage and completely

 Â Â  relaxes . . . s/b alternator field voltage is

 Â Â  reduced to near zero.



 Â Â  If the main alternator shuts down, bus voltage

 Â Â  sags, s/b regulator 'wakes up' and the second

 Â Â  alternator goes to work.Â  The only thing 'magic'

 Â Â  about the s/b alternator is the current sensor

 Â Â  system that annunciates 's/b alternator active'

 Â Â  and assists in load shedding to some value at

 Â Â  or below the alternator's rated output.



 Â Â  But even when the alternators are on line together

 Â Â  and closely adjusted for set point, they're well

 Â Â  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

Display posts from previous:

	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