View Single Post
  #3   Spotlight this post!  
Unread 07-02-2012, 08:09
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: 10,792
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: Blowing spike fuses

Quote:
Originally Posted by rsegrest View Post
We have toyed with wiring, code, and fuses (both the standard 20AMP yellow fuses and the reset fuses in the PDboard) and just can't seem to locate our issue. Ideas would be appreciated regarding what we might be missing.
You are missing nothing. It is simply that the motor is drawing far more than 20 amps. Remember that every motor draw stall current when you first apply power to the motor. When you couple the motor to a mechanism that adds a load to the motor, the stall current (or near to that amount) will flow for long enough to blow the fuse. The 20 amp fuse in the Spike is designed to protect the contacts of the relays inside the Spike. Your only choice is to reduce the load on the motor or swap the Spike for a speed controller.
__________________
Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
________________________
Storming the Tower since 1996.