View Single Post
  #15   Spotlight this post!  
Unread 25-02-2005, 15:48
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: 10,770
Al Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond repute
Re: victor 884 blowout

Quote:
Originally Posted by mtaman02
I witnessed a V884 Blow out but the funny part was only part of it went. The Device that was being used refused to go in reverse but it went forward just fine the only problem is is that it refused to stop once you got off the sticks.
What you describe is a classic case of miscalibration. Remember that the controller when it is in calibrate, determines the full forward and reverse of the joystick travel and the at rest position and then stores them when the calibrate button is released. If the robot drives forward with the joystick and then slows down but doesn't stop when you release, try recalibrating. Failure mode on the controller could be no movement in either direction if the FETs go open or full power in one direction if they FETs short. If all FETs short there is a brief period where there can be smoke, fire, arcing and/or the sound of cracking plastic.
__________________
Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
________________________
Storming the Tower since 1996.