View Single Post
  #6   Spotlight this post!  
Unread 01-12-2013, 20:23
aklego aklego is offline
Registered User
FTC #3595 (Schrödinger's Hat)
Team Role: Mentor
 
Join Date: Oct 2009
Rookie Year: 2004
Location: Alaska
Posts: 89
aklego is just really niceaklego is just really niceaklego is just really niceaklego is just really nice
Re: [FTC]: Tetrix motor controller weirdness with 4 motors

Quote:
Originally Posted by Al Skierkiewicz View Post
ak,
This sounds so much like an over current issue with four motors running. When you add up the motors, the reversing as a repeatable cause and reboot to clear the problem, it seems like everything is pointing to the motor loads dragging the battery voltage down. The inductor used in the previous motors was under rated for current such that repeated stall current would eventually burn open the inductor. This does not sound like RF interference as that would produce more problems and generally be not repeatable. RF is at it's highest while the motor is running wide open or under heavy load.
I would agree except that it would do it when the motors were unloaded, i.e the robot was up on blocks just spinning it's wheels. What is completely puzzling to me is that this is a pretty standard FTC configuration.

But I would also agree that my explanation, (RF issues) is unlikely.

Not knowing the root cause puts our "fix" in the realm of voodoo and that is particularly unsatisfying.
__________________
let tau = 2pi
Reply With Quote