Thread: Just out of curiosity..
View Single Post
  #2   Spotlight this post!  
Unread 24-06-2002, 02:28
archiver archiver is offline
Forum Archival System
#0047 (ChiefDelphi)
  
Join Date: May 2001
Location: Pontiac, MI
Posts: 21,214
archiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond repute
Re: Just out of curiosity..
Posted by Lloyd Burns at 03/17/2001 10:49 PM EST


Engineer on team #188, Woburn Robotics, from Woburn Collegiate and TorDistSchoolBrd, ScotiaBank. OntPwrGen, Enbridge.


In Reply to: Just out of curiosity..
Posted by Gui Cavalcanti on 03/17/2001 6:10 PM EST:



: What would cause a spike relay fuse to blow out? I have one here in my hand, a "souvenir" of regionals, as it were... I found it on the floor when we were leaving, and the little filament inside is broken. I didn't think that could happen on a spike relay. Any ideas as to what caused this?

. One thing that causes this (and has for at least three years) is the starting current drawn by a compressor trying to start pushing air into a pressurized air system. The pump, once it gets going, only needs about 8 A, but when the pressure keeps the pump from going through the first cycle, the motor can't move, can't generate "back e.m.f., and can't help but draw "locked rotor current" of about 25+ A.

. I saw it happen to another team this year. It might be avoidable if the compressor-starting pressure (of the pressure switch) were set to a lower figure.

: Programmer-who-shouldn't-be-dabbling-in-electrical,
: Gui

: Team 422 (Mech Tech)


__________________
This message was archived from an earlier forum system. Some information may have been left out. Start new discussion in the current forums, and refer back to these threads when necessary.