Re: Relay problem


Rich Grise wrote:
> On Fri, 27 Jan 2006 21:46:43 +0000, capnfishytakethisout wrote:
>
> > This could be OT, but I'm posting here to get replies with no baggage....
> > I have a relay in my boiler which buzzes/arcs I'm trying to diagnose the
> > fault, probably in my wiring. What conditions (eg shorting) would cause a
> > relay to switch on & off very rapidly (leading to a buzzing noise) & arc?
> > Many thanks
> > Jonathan
>
> It's ON-topic for s.e.basics, so no worries on that account. The only
> OFF-topic questions on s.e.b are those that don't involve electrons in one
> way or another. ;-)
>
> I'd look at the physical condition of the relay, like dirt or some
> obstruction; and check all of the connections in the relay's coil
> circuit. It sounds like it's not pulling in fully.
>
> It used to work, and this symptom appeared recently, right?
>
> Thanks,
> Rich

Hi, Rich. Always good to hear from you. Nice to see you're spending
some time amidst us groundlings on s.e.b.

You're right, it's probably a good idea to look at the physical
condition of the relay first. Since it's a heating application, I'd
guess it's probably an AC relay, so I'd also suspect a partial short in
the coil, or a loose shading ring. Sometimes the shading ring comes
loose, and can be snapped back into place.

http://www.geindustrial.com/pm/notes/artsci/art02.pdf

Less likely, the thermostat or sensor switch driving the relay might
not be closing fully, or has gotten resistive.

Best solution might be to replace the relay, and see if that solves the
problem. If it doesn't, the solution is probably in the switch or
thermostat.

I hope this does something to improve the knowledge : baggage ratio.

Good luck
Chris

.

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