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Message text written by INTERNET:lancair.list@olsusa.com
For whatever
reason, I'm somewhat insensitive to pain (big grin), but this critter is
too
hot for me to touch. Have any of you fondled your master relay lately? Any
feedback would be appreciated.<
Check the current going through the coil of your relay. It should be about
1 amp. If the coil current is OK then check the voltage drop across the
contacts under load. The voltage drop should be minimal. Perhaps the
contacts of your relay have developed some extra resistance and thus the
reason for all the heat. I would replace the relay regardless! They are
relatively inexpensive. 1 ampere through the coil at 14 volts is 14 watts
of heat which is not enough to heat up the relay to the temps you indicate.
An aircraft draw of 50 amps through a poor relay contact with a voltage
drop of 2V across the contact is 100 watts. Now that will get the sucker
hot!
Jim Frantz
Lancair Network News
LML homepage: http://www.olsusa.com/Users/Mkaye/maillist.html
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