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reset time for crowbar

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kenryan

Joined: 20 Oct 2009
Posts: 429

Posted: Sun Dec 14, 2014 1:21 pm Post subject: reset time for crowbar

How long does it take for the crowbar OVP device to reset, once the over voltage condition has been removed?

  [quote][b]

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nuckolls.bob(at)aeroelect
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Posted: Sun Dec 14, 2014 6:15 pm Post subject: reset time for crowbar

At 15:18 2014-12-14, you wrote:

 	  Quote: 	
		  How long does it take for the crowbar OVP device to reset, once the 

over voltage condition has been removed?


	




   Power to activate an ov trip comes through the

   field supply circuit breaker. As soon as the

   crowbar 'trips' . . . voltage to the field

   drops to about 1.5v until the breaker opens

   10-20 milliseconds later whereupon the

   field voltage falls to zero.



   The crowbar module 'latches' ON for

   as long as any substantial amount of current flows

   through it. So as soon as the breaker opens, the

   SCR current goes to zero, the crowbar module is

   then 'unlatched' or officially 'reset' depending on

   which term you prefer.



   Bob . . .

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