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GISdude
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Join Date: Jun 2007
Location: Sacramento, CA
Posts: 33

Lockout Relay and Diode

04/13/2015 5:05 PM

Hi all, I'm trying to figure out this lockout relay scheme. I copied part of this from a DC print and the Diodes (3R) and the BF (breaker failure) are confusing me. Look at 74-1. I know if a failure happens at along 50BF222 (breaker fail), current flows to 52-1/b. But how does the 67-222 and 86B1 "know" to lock out? I think I'm missing a conceptual error here…

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Pathfinder Tags: lockout relay
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NotUrOrdinaryJoe
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Popular Science - Cosmology - New Member Technical Fields - Technical Writing - New Member Engineering Fields - Energy Engineering - New Member Engineering Fields - Electrical Engineering - New Member Engineering Fields - Control Engineering - New Member Engineering Fields - Electromechanical Engineering - Old Member, New Association

Join Date: Apr 2008
Location: Lexington, KY
Posts: 1639
Good Answers: 73
#1

Re: Lockout Relay and diode

04/13/2015 6:46 PM

Is there any way you could improve the image? I can't make out any details.

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GISdude
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Join Date: Jun 2007
Location: Sacramento, CA
Posts: 33
#2
In reply to #1

Re: Lockout Relay and diode

04/14/2015 10:28 PM

yeah. i'll have to work on it tonight.

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