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Unread 16-02-2011, 07:45
Jared Russell's Avatar
Jared Russell Jared Russell is offline
Taking a year (mostly) off
FRC #0254 (The Cheesy Poofs), FRC #0341 (Miss Daisy)
Team Role: Engineer
 
Join Date: Nov 2002
Rookie Year: 2001
Location: San Francisco, CA
Posts: 3,077
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Re: Banebots RS-775 Case Short

There were no fireworks when we tried this. For motor #1, there was a very quiet "pop" sound at first, then nothing. For motor #2, there was a bit of an arc when the motor lead was attached, then nothing. For motor #3, there was no visible or audible reaction at all. The suggestion to use a 40A breaker is a good one.

2 of the 3 775s on our first robot were affected by the case short. Prior to doing the "zapping", we were measuring ~8 megaohms between the negative battery lead and conductive parts of our chassis. After removing each affected motor and applying the fix, we now max out the ohmmeter (>30 megaohm resistance).