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relay clatter


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puginfo 
Member - Posts: 7
Member spacespace
Joined: May 17, 2005
Posted: May 17, 2005 at 1:59 AM / IP Logged  

>>> hi all, i use a vacuum sensor running of the intake manifold to cutoff the aircon compressor when i drive hard. the problem i have is, the sensor is very sensitive to vacuum variations thus the output voltage swings at certain points of the accellerator. this voltage variation in turn causes the a/c cutoff  relay to clatter. i think the alternator has a hard time as well because the relay clatter causes intermittent load. would there be a simple solution just to latch or hold the relay 'ON' for some specified period of time?

thks and cheers

hotwaterwizard 
Silver - Posts: 1,350
Silver spacespace
Joined: December 11, 2003
Location: California, United States
Posted: May 17, 2005 at 8:59 PM / IP Logged  
Just put a 1000uf capacitor across the relay coils to absorb the surge.
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
puginfo 
Member - Posts: 7
Member spacespace
Joined: May 17, 2005
Posted: May 17, 2005 at 10:45 PM / IP Logged  
>>> thks for the input John. how long - approx. would the 1000uF be able to latch the relay?
hotwaterwizard 
Silver - Posts: 1,350
Silver spacespace
Joined: December 11, 2003
Location: California, United States
Posted: May 18, 2005 at 11:28 PM / IP Logged  

no it would stop the clatter.

If you want to latch a relay you can with this circuit.

relay clatter -- posted image.

To unlatch it just cut the power to it.

Or you could latch and ynlatch with switches like this Diagram.

relay clatter -- posted image.

John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

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