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 Need help with our drive system and electronics

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ringgold15



People Skills : 1499
Registration date : 2013-08-30
Age : 20
Location : Ringgold High School

PostSubject: Need help with our drive system and electronics   Fri Aug 30, 2013 9:57 pm

Last year we ran into problems with our drive system.  We bought a Sabertooth dual 60A motor driver and used two RS775 Motors - 12V.  we tested the bot by driving it straight into the wall and going full speed forward then straight into reverse at full speed without any problems.  As soon we hit into another bot, it would completely shut down. Each motor has a stall current of 30 amps and the sabertooth has a max peak of 120 amps per channel so we can not figure out why it would shut down.  does any body have any advice on how to fix this?
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ringgold15



People Skills : 1499
Registration date : 2013-08-30
Age : 20
Location : Ringgold High School

PostSubject: the rs-775-12v motor actually has a stall current of 30 amps you are thinking of the rs-775-18v   Sun Sep 01, 2013 12:27 am

Performance
Model M5-RS775-12
Operating v : 6v - 18v
Nominal v : 12v
No Load RPM : 7300
No Load A : 1.1A
Stall Torque : 61.1 oz-in 431.5 mN-m
Stall Current : 30A
Kt : 2.04 oz-in/A 14.4 mN-m/A
Kv : 608 rpm/V
Efficiency : 76.8%
RPM - Peak Eff : 7300
Torque - Peak Eff : 11.69 oz-in 82.6 mN-m
Current - Peak Eff : 5.7A
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ringgold15



People Skills : 1499
Registration date : 2013-08-30
Age : 20
Location : Ringgold High School

PostSubject: Re: Need help with our drive system and electronics   Sun Sep 01, 2013 12:34 am

we are using a 16:1 gear ratio

a whyachi MS05 DC Power Switch

and we do not have a video of it. it only happens when it hits into another bot.  we have rammed it up against walls and nothing has happened and also basically sat on top of it and tried to make it move and it wont shut down like it does in the arena
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ringgold15



People Skills : 1499
Registration date : 2013-08-30
Age : 20
Location : Ringgold High School

PostSubject: Re: Need help with our drive system and electronics   Sun Sep 01, 2013 11:30 pm

What is a brown out?
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Koensig



People Skills : 2507
Registration date : 2011-02-25
Age : 23
Location : Terre Haute, Indiana

PostSubject: Re: Need help with our drive system and electronics   Wed Sep 04, 2013 12:50 pm

Our 15lb 'bot uses the same ESC switch and Drivetrain and didn't have any problems. As Alex says it's probably a loose connection.
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PostSubject: Re: Need help with our drive system and electronics   

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Need help with our drive system and electronics
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