relay clatter

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puginfo

Member - Posts: 7

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

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hotwaterwizard

Silver - Posts: 1,350

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 !

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puginfo

Member - Posts: 7

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?

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hotwaterwizard

Silver - Posts: 1,350

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.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

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relay clatter

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