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Unread 17-10-2012, 09:33
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: Side of Drives Giving Out

Leeland,
The Jags have an over current protection circuit that will remove motor drive for 3-4 seconds and flash the red LED on the face of the Jag. When a breaker trips open it resets almost immediately and there is a audible click. When repeatedly tripped it can cause a buzzing sound.
It is quite possible that over the months since build, hardware has loosened and mechanical parts have moved. This could cause friction in the drive that was not present earlier in the season.
Since you state that the robot can drive after a few seconds, my money is on the Jag over current protection.

Note: We had some CIM failures earlier this season. Upon inspecting the interior of the motors, we found that some of the winding wires had actually broken away from the commutator. These were older CIMs and had been put through some excessive driving. I believe that the overheated motors weakened the copper at stress points and caused the cracks. I posted pictures in a different thread earlier this year.
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Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
________________________
Storming the Tower since 1996.

Last edited by Al Skierkiewicz : 17-10-2012 at 09:36.
 


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