OCCRA
Go to Post I have always liked to see people get recognized for what they do, not people doing something to get recognized. - sanddrag [more]
Home
Go Back   Chief Delphi > Technical > Electrical
CD-Events   CD-Media   CD-Spy   FRC-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
Closed Thread
Thread Tools Rate Thread Display Modes
  #1   Spotlight this post!  
Unread 01-16-2008, 03:06 PM
Never_Fade's Avatar
Never_Fade Never_Fade is offline
Sub-Programmer
AKA: Michael Brown
FRC #0842 (Falcon Robotics)
Team Role: Programmer
 
Join Date: Mar 2005
Rookie Year: 2004
Location: Phoenix
Posts: 3
Never_Fade is an unknown quantity at this point
Send a message via MSN to Never_Fade Send a message via Yahoo to Never_Fade
Where to connect the backup battery charger

We have a question about the backup battery charger (Found here).

We are curious if we are supposed to connect the 12v in(of the charger) before the master breaker, or after the master breaker.

http://picasaweb.google.com/KE7CKI/Robotics/photo#5156166962017891010
We have it hooked up on this side. Can we hook it up here?

We currently have the 12v in connected after the master breaker (on the 20/30 fuse panel), the 'backup battery input on RC unit' connected to the battery input on the RC, and 'backup battery' label on the diagram connected to the backup battery.

Our situation occurs here. When we do not have the main 12v battery powered up, the 7.5v backup powers the system, through its connection on the 20/30 fuse panel.

If we were to connect the battery charger in the line before the master breaker, the 12v battery could be in -charging our 7.5 backup- while the breaker was restricting power to the rest of the robot. We are under the impression that this is illegal because that means that there is power running while the breaker is off (which defeats it's purpose, in a sense).
  #2   Spotlight this post!  
Unread 01-16-2008, 07:52 PM
kE7JLM's Avatar
kE7JLM kE7JLM is offline
KE7JLM `
AKA: John Harris
FRC #0842 (Falcon Robotics)
Team Role: Driver
 
Join Date: May 2007
Rookie Year: 2006
Location: Phoenix, AZ`
Posts: 136
kE7JLM is a name known to allkE7JLM is a name known to allkE7JLM is a name known to allkE7JLM is a name known to allkE7JLM is a name known to allkE7JLM is a name known to all
Send a message via MSN to kE7JLM
Re: Where to connect the backup battery charger

I don't know that is a good question....!?
__________________
Team 842 Programmer

Pictures at:
http://picasaweb.google.com/KE7JLM
&
http://picasaweb.google.com/john.h.842

Videos -
http://www.youtube.com/user/KE7JLM

When your not busy with FIRST try NURC

  #3   Spotlight this post!  
Unread 01-16-2008, 11:03 PM
popo308's Avatar
popo308 popo308 is offline
Registered User
AKA: Brent
FRC #1625 (Winnovation)
Team Role: Alumni
 
Join Date: Jan 2007
Rookie Year: 2006
Location: Winnebago, IL
Posts: 312
popo308 is a name known to allpopo308 is a name known to allpopo308 is a name known to allpopo308 is a name known to allpopo308 is a name known to allpopo308 is a name known to all
Send a message via AIM to popo308
Re: Where to connect the backup battery charger

Why not just throw some spaid connectors on there and run it through the fuse panel?
  #4   Spotlight this post!  
Unread 01-16-2008, 11:42 PM
Jim E Jim E is offline
Registered User
FRC #1523 (M.A.R.S.)
Team Role: Mentor
 
Join Date: Jun 2006
Rookie Year: 2005
Location: Lantana, FL
Posts: 188
Jim E has a reputation beyond reputeJim E has a reputation beyond reputeJim E has a reputation beyond reputeJim E has a reputation beyond reputeJim E has a reputation beyond reputeJim E has a reputation beyond reputeJim E has a reputation beyond reputeJim E has a reputation beyond reputeJim E has a reputation beyond reputeJim E has a reputation beyond reputeJim E has a reputation beyond repute
Re: Where to connect the backup battery charger

We have used the IFI circuit for 2 years now and have noticed the partial feedback issue. No inspector or referee has complained yet. It isn't an optimal design. but it will drain your backup battery if allowed to continue.

This year FIRST alloes custom charging ckts. If 'not happy, Draw
__________________
Team MARS = 1.523 AU from the SUN!

Jim E.
  #5   Spotlight this post!  
Unread 01-16-2008, 11:47 PM
falconmaster's Avatar
falconmaster falconmaster is offline
FIRST Senior Mentor
AKA: Ledge
FRC #0842 (Falcon Robotics)
Team Role: Teacher
 
Join Date: Jan 2004
Rookie Year: 2001
Location: Phoenix, Arizona
Posts: 1,292
falconmaster has a reputation beyond reputefalconmaster has a reputation beyond reputefalconmaster has a reputation beyond reputefalconmaster has a reputation beyond reputefalconmaster has a reputation beyond reputefalconmaster has a reputation beyond reputefalconmaster has a reputation beyond reputefalconmaster has a reputation beyond reputefalconmaster has a reputation beyond reputefalconmaster has a reputation beyond reputefalconmaster has a reputation beyond repute
Send a message via MSN to falconmaster
Re: Where to connect the backup battery charger

Quote:
Originally Posted by Jim E View Post
We have used the IFI circuit for 2 years now and have noticed the partial feedback issue. No inspector or referee has complained yet. It isn't an optimal design. but it will drain your backup battery if allowed to continue.

This year FIRST alloes custom charging ckts. If 'not happy, Draw
Are you sure that this year we can use our own charging circuit?!!!! Where do you see that?
__________________
Faridodin "Fredi" Lajvardi KD7WKD
coachfredi@hotmail.com
Take the plunge! Try Robotics Underwater
National Underwater Robotics Challenge

Arizona Regional Winner 2011, 2012, 2013
Motorola Quality Award 2012
Championship Chairman's 2008 HOF
Arizona Regional Chairman's 2005,2006,2007,2008
Championship Engineering Inspiration 2005
Championship Honorable Mention Chairman's 2006
Kliner Perkins Caufield & Beyers Entrepreneur Award, LA Regional , & LV Regional 08
MATE National Underwater Robotics Championships 2004
Pete Conrad Foundation, Spirit of Innovation National Champions 2010
Woodie Flower's Championship Award Winner 2013
AUVSI & ONR Robosub 8th in world 2013
  #6   Spotlight this post!  
Unread 01-16-2008, 11:51 PM
jgannon's Avatar
jgannon jgannon is offline
I ᐸ3 Robots
AKA: Joey Gannon
no team
 
Join Date: Feb 2004
Rookie Year: 2004
Location: Pittsburgh, PA
Posts: 1,475
jgannon has a reputation beyond reputejgannon has a reputation beyond reputejgannon has a reputation beyond reputejgannon has a reputation beyond reputejgannon has a reputation beyond reputejgannon has a reputation beyond reputejgannon has a reputation beyond reputejgannon has a reputation beyond reputejgannon has a reputation beyond reputejgannon has a reputation beyond reputejgannon has a reputation beyond repute
Re: Where to connect the backup battery charger

Quote:
Originally Posted by falconmaster View Post
Are you sure that this year we can use our own charging circuit?!!!! Where do you see that?
Sounds like it... check this out.
Quote:
<R49> The 7.2v backup battery may be charged on or off the ROBOT. When off the ROBOT, the battery is to be charged with a 7.2V backup battery charger. When mounted on the ROBOT, the backup battery may be charged from the 12VDC primary battery by using the custom charging circuit available from Innovation First Inc. or any similar charging circuit (note: IFI will provide the design for this circuit on the IFI website, however teams must obtain the parts for this circuit and assemble it themselves). The use of this circuit is strongly encouraged.
__________________
Team 1743 - The Short Circuits
2010 Pittsburgh Excellence in Design & Team Spirit Awards
2009 Pittsburgh Regional Champions (thanks to 222 and 1218)
2007 Pittsburgh Website Award
2006 Pittsburgh Regional Champions (thanks to 395 and 1038)
2006 Pittsburgh Rookie Inspiration & Highest Rookie Seed

Team 1388 - Eagle Robotics
2005 Sacramento Engineering Inspiration
2004 Curie Division Champions (thanks to 1038 and 175)
2004 Sacramento Rookie All-Star

_
  #7   Spotlight this post!  
Unread 01-16-2008, 11:54 PM
Alan Anderson's Avatar
Alan Anderson Alan Anderson is offline
Software Architect
FRC #0045 (TechnoKats)
Team Role: Mentor
 
Join Date: Feb 2004
Rookie Year: 2004
Location: Kokomo, Indiana
Posts: 7,916
Alan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond reputeAlan Anderson has a reputation beyond repute
Send a message via AIM to Alan Anderson
Re: Where to connect the backup battery charger

It's a custom circuit. It has to be powered from a 20A circuit breaker.

To address the problem with back-feeding the rest of the robot, just add another 1N5820TR diode in series with the power input. You might still see a small issue with the backup battery draining (slowly) through the charger circuit itself when the robot is powered off, but it will no longer try to run all the Victors.
Closed Thread


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Alternate Backup Battery Charger Phalanx Electrical 5 02-24-2007 02:51 PM
Powering the cam without a backup battery Uberbots Programming 11 01-27-2006 10:00 AM
Problem with the battery charger Lightposter Electrical 4 01-19-2006 10:39 AM
Battery Charger for long term battery care DougHogg Kit & Additional Hardware 0 02-08-2003 03:25 PM
how do u connect the battery to the robot interface? chrisw Technical Discussion 1 01-10-2002 04:41 PM


All times are GMT -5. The time now is 12:15 PM.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi