Re: Automotive Circuit Protection - Part 2

[Pat Ford <pford@qnx.com>]

Hi Garfield, et al:
 Ive measured loaddump WAY above 70V, here is the scenerio, jump starting a car.
Car A is running ~3000 rpm Vbat ~14.4, car B cranks draw the combined A and B 
voltage down to ~9. Alternator is now pumping out Max power. When the starter 
is released  on car B the alt in car A is still putting out max power, even 
with the battery I measured +186V.
 I took the alt back to get it tested and was told that the magnetic field takes 
time to decay, AND there is a small delay before the regulator can respond.

 Otherwise I agree with everything you've said
 

Previously, you (Garfield Willis) wrote:
{ On Fri, 23 Jun 2000 16:35:40 -0700, garwillis@msn.com (Garfield Willis)
{ wrote:
{ 
{ Dang, here's another errata:
{ 
{ >Name				transient V			frequency/cause
{ >---------				----------------			-------------------
{ >
{ >Load Dump		pos/~70V			each load disconnect
{ >ALT Field Decay	neg/~100V			shutdown of elec. sys.
{ >Ind. Load Decay	pos/neg/-+50V		varied
{ >Reverse Bat		neg/14V			screw-up
{ >Double Bat			pos/28V			jmp-start/boosters
{ 
{ >Load Dump		pos/~70V			each load disconnect
{ 
{ the above line SHOULD READ:
{ 
{ Load Dump			pos/~70V			batt disconnect
{ 

--
Pat Ford                           email: pford@qnx.com
QNX Software Systems, Ltd.           WWW: http://www.qnx.com
(613) 591-0931      (voice)         mail: 175 Terence Matthews          
(613) 591-3579      (fax)                 Kanata, Ontario, Canada K2M 1W8

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo@lists.diy-efi.org