View Single Post
  #18   Spotlight this post!  
Unread 15-10-2012, 12:28
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: 10,798
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: 110V AC to 12V DC suggestion

I have checked the currents but did not record the data. As I remember, the current spiked as expected and loaded currents were not far from predicted. I used a four motor chassis with one motor on each side providing dynamic loads to the other motor. We connected various values of resistance across the driven motor including a dead short to simulate loading on the driving motors.
From observation, few teams will actually trip any breakers. Several teams appeared to trip the 40 amp breakers this season and a few also reported tripping the main breaker this season. Making some assumptions on wiring designs, the "must hold" data for 250% would likely be the most accurate for general use. From the linked spec sheet that would be 1.8 seconds max.
I would agree with Gary and add that motor start currents would likely trip this supply on over current even with just a single motor.
__________________
Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
________________________
Storming the Tower since 1996.

Last edited by Al Skierkiewicz : 15-10-2012 at 12:31.