Thread: Victor 884 won't go forward
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Unread 22-10-2005, 12:52
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Matt Krass Matt Krass is offline
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AKA: Dark Ages
FRC #0263 (Sachem Aftershock)
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Re: Victor 884 won't go forward
My team has a Victor with the same failure characteristics also, but we've determined the cause to be driving the motor the victor was connected to manually.

In Atlanta,, a student got metal shavings in one of our Victors for the drive, and it blew out next power up. We were left with 3 functioning and a few minutes until our next match. So we decided to go from 4-motor/2-wheel to 2-motor/2-wheel. But in our rush we only disconnected the PWMs to the corresponding Victor on the other side of the drive. After the match that Victor failed to work. We think it's because the disconnected motor was manually spun by transmission (it was geared to a working CIM) and the reverse current flow blew out the forward half of the H-bridge. It's the only logical problem we can find, and seeing as how 2 motors geared together was considerably more popular this year, combined with loose PWM cables, that could explain the apparent rise in Victor failures.

I think.
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Matt Krass
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I'm a FIRST relic of sorts, I remember when we used PBASIC and we got CH Flightsticks in the KoP. In my day we didn't have motorized carts, we pushed our robots uphill, both ways! (Houston 2003!)