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Unread 22-02-2011, 08:40
Unsung FIRST Hero
Al Skierkiewicz Al Skierkiewicz is offline
Broadcast Eng/Chief Robot Inspector
AKA: Big Al WFFA 2005
FRC #0111 (WildStang)
Team Role: Engineer
 
Join Date: Jun 2001
Rookie Year: 1996
Location: Wheeling, IL
Posts: 10,798
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Re: Possibly Ruined All Four Jaguars

Quote:
Originally Posted by somenerd View Post
Through a series of unfortunate events, our jaguars controlling our CIM motors were wired incorrectly. V+ and V- was inserted into M+ and M- and vice versa.
Both Jags and Victors use power FETs in the motor drive output. These devices contain a internal diode across the source drain terminals and when voltage is applied to the motor terminals, the diodes will conduct. This high current is manifested by the smoke released during your power on. Unfortunately all four controllers are damaged. I am guessing these were Black Jags.
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Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
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Storming the Tower since 1996.