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 

Can a low voltage situation cause a fuse to blow?

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> AeroElectric-List
View previous topic :: View next topic  
Author Message
ceengland7(at)gmail.com
Guest





PostPosted: Tue Jun 26, 2018 5:24 am    Post subject: Can a low voltage situation cause a fuse to blow? Reply with quote

'Switcher' power supply. 

On Tue, Jun 26, 2018 at 8:11 AM, Alec Myers <alec(at)alecmyers.com (alec(at)alecmyers.com)> wrote:
Quote:
--> AeroElectric-List message posted by: Alec Myers <alec(at)alecmyers.com (alec(at)alecmyers.com)>

I have a radio that requires 7.5A breakers on a 28v supply, and 10A breakers on a 12V supply. If the voltage drops the supply current requirement rises.

On Jun 26, 2018, at 09:02, Eric M. Jones <emjones(at)charter.net (emjones(at)charter.net)> wrote:

--> AeroElectric-List message posted by: "Eric M. Jones" <emjones(at)charter.net (emjones(at)charter.net)>

First of all, low voltage IN GENERAL does not cause a fuse to blow. Look at all the cars with dead batteries for an example. Fuses are never even investigated.

Two phenomena contribute to the notion: 1) Back EMF, which reduces the running current when the motor comes up to speed, and 2) Starter circuits for motors which draw large currents UNTIL the motor gets up to speed. I won't go into the details, but they are similar, and both have to do with motor starting circuits.

I might add a third (rare) one: electronic circuits that try to keep an output constant. Usually these circuits have enough smarts to not blow an input fuse.

For circuits that only power resistive loads, fuse-blowing at low voltage is never an issue.

--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=481213#481213











====================================
-
Electric-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
====================================
FORUMS -
eferrer" target="_blank">http://forums.matronics.com
====================================
WIKI -
errer" target="_blank">http://wiki.matronics.com
====================================
b Site -
          -Matt Dralle, List Admin.
rel="noreferrer" target="_blank">http://www.matronics.com/contribution
====================================





- 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
alec(at)alecmyers.com
Guest





PostPosted: Tue Jun 26, 2018 5:47 am    Post subject: Can a low voltage situation cause a fuse to blow? Reply with quote

no doubt. but the results stand.

On Jun 26, 2018, at 09:23, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
'Switcher' power supply.

On Tue, Jun 26, 2018 at 8:11 AM, Alec Myers <alec(at)alecmyers.com (alec(at)alecmyers.com)> wrote:
Quote:
--> AeroElectric-List message posted by: Alec Myers <alec(at)alecmyers.com (alec(at)alecmyers.com)>

I have a radio that requires 7.5A breakers on a 28v supply, and 10A breakers on a 12V supply. If the voltage drops the supply current requirement rises.

On Jun 26, 2018, at 09:02, Eric M. Jones <emjones(at)charter.net (emjones(at)charter.net)> wrote:

--> AeroElectric-List message posted by: "Eric M. Jones" <emjones(at)charter.net (emjones(at)charter.net)>

First of all, low voltage IN GENERAL does not cause a fuse to blow. Look at all the cars with dead batteries for an example. Fuses are never even investigated.

Two phenomena contribute to the notion: 1) Back EMF, which reduces the running current when the motor comes up to speed, and 2) Starter circuits for motors which draw large currents UNTIL the motor gets up to speed. I won't go into the details, but they are similar, and both have to do with motor starting circuits.

I might add a third (rare) one: electronic circuits that try to keep an output constant. Usually these circuits have enough smarts to not blow an input fuse.

For circuits that only power resistive loads, fuse-blowing at low voltage is never an issue.

--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=481213#481213











====================================
-
Electric-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
====================================
FORUMS -
eferrer" target="_blank">http://forums.matronics.com
====================================
WIKI -
errer" target="_blank">http://wiki.matronics.com
====================================
b Site -
-Matt Dralle, List Admin.
rel="noreferrer" target="_blank">http://www.matronics.com/contribution
====================================





- 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