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Unread 12-10-2013, 09:34
Unsung FIRST Hero
Al Skierkiewicz Al Skierkiewicz is offline
Broadcast Eng/Chief Robot Inspector
AKA: Big Al WFFA 2005
FRC #0111 (WildStang)
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Re: Interesting Vexpro Victor 888 failure.

Bill,
I think you are correct. There is every indication that one of the FETs in the H bridge is shorted as Jon pointed out above. Since it is not switching it will produce non-linear results in one direction and then produce a short to the high side FET leg when commanded to the other direction. It is unlikely the Victor is making the clicking sound, it is the breaker feeding the Victor as indicated by the LED flashing. However, the shorted FET may be making some noise when voltage is supplied. This is highly unusual but possible.
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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.

Last edited by Al Skierkiewicz : 13-10-2013 at 17:35.