Matronics Email Lists :: View topic - Ducati voltage

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

Ducati voltage - ATTN Frans Veldman

Matronics Email Lists Forum Index -> Europa-List

View previous topic :: View next topic

Author Message

Fergus Kyle

Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada

Posted: Fri Aug 28, 2009 1:45 pm Post subject: Ducati voltage - ATTN Frans Veldman

Frans,

	You said:

"You can connect this [12V point "C"] directly to the adjacent connector

('B' or 'R', which carries the actual output)............but a more correct

way is to connect it directly to the battery......."

	At the bottom of page78 of the Install 914F manual/1996 05 10,

titled "Requirements for flawless operation of the rectifier-regulator". The

fifth item states "never sever connection between terminal C and +B of

regulator e.g. by removal of a fuse". 

	Or these two quotes mutually acceptable, or have I misinterpreted

the meaning. I don't mean by removing a fuse, but separating C and +B on the

regulator? I suppose I should scan the electric circuit of the regulator but

I'm lazy.

Cheers, Ferg

A064 Europa Classic 914 CSprop

- The Matronics Europa-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?Europa-List

winmail.dat

Description:

Download

Filename:

winmail.dat

Filesize:

7.94 KB

Downloaded:

259 Time(s)

frans(at)paardnatuurlijk.
Guest

Posted: Fri Aug 28, 2009 2:59 pm Post subject: Ducati voltage - ATTN Frans Veldman

Fergus Kyle wrote:

 	  Quote: 	
		   Frans,

 	You said:

 "You can connect this [12V point "C"] directly to the adjacent connector

 ('B' or 'R', which carries the actual output)............but a more correct

 way is to connect it directly to the battery......."


	


Consider B and R of the output of the regulator, and C as the sensor

wire, which measures the output voltage. You can connect them together

of course, and it will more or less work as intended. However, there is

always a small voltage loss over the cable from the regulator to the

battery. This means that the battery will get slightly less than

intended. So, by hooking the sensor wire (C) directly to the battery,

the regulator will automatically compensate for cable losses, because it

tries to keep the voltage at C constant. (That's why we call it a

regulator). Some my wonder if the cable attached to C won't have losses

by itself and defeat the purpose. The answer is No, because there is no

current in the cable attached to C. Put Ohm's law into the equation, and

you will see that without current, there won't be any cable loss. The

output of the regulator however will provide all the power to the ship,

so cable losses are at that point quite high. So, by connecting the

sensor wire at the battery, the regulator will keep the voltage at the

battery constant, regardless of cable losses.



 	  Quote: 	
		   	At the bottom of page78 of the Install 914F manual/1996 05 10,

 titled "Requirements for flawless operation of the rectifier-regulator". The

 fifth item states "never sever connection between terminal C and +B of

 regulator e.g. by removal of a fuse". 


	


What they mean is that you should keep the sensor (C wire) always

somehow connected to the output of the regulator. But not necessarily

via the shortest route. It is logical if you think about it, if you were

to disconnect the sensor wire completely, the regulator would measure a

very low voltage (zero) and crank up the voltage at B and R untill it

measures the correct voltage, which will never happen in that situation.

If the manufacturer intended to keep C and B and R always connected via

the shortest route, he would have done this internally and not bothered

to make them available via separate pins.



Frans

- The Matronics Europa-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?Europa-List

Display posts from previous:

	Matronics Email Lists Forum Index -> Europa-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