RE: Buzzing relays? Anyone help?

["Rodney Hall" <rmh@xxxxxxxxxx>]

Try putting a 1 amp 400v rectifier diode in series with the relay coil.
--
Rodney Hall
Dum spiro spero
While I breathe, I hope
~~~~~~~~~~~~~~~
rmh@xxxxxxx
http://rmhh.co.uk/
http://rmhh.org.uk/
~~~~~~~~~~~~~~~~~~~


> -----Original Message-----
> From: mailinglists [mailto:mailinglists@xxxxxxx]
> Sent: Saturday, January 22, 2005 1:31 PM
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Buzzing relays? Anyone help?
>
>
> After a successful install of my automated hot water/central heating
> controls (with many thanks to Neil Fuller for his donation of
> a foot of
> DIN rail to securely mount the relays!), I've just noticed a
> small but
> annoying problem.
>
> The relays buzz slightly when they are off. The installation is
> basically two big 240V relays connected into the CH/HW wiring, the
> relays have 240V coils that are switched by a pair of X10 appliance
> modules due to the distance between the server and the airing
> cupboard.
>
> At a guess I'd say that the leakage current from the modules
> is enough
> to make coils buzz. The problem is exacerbated by the relays being on
> one side of a plasterboard partition wall, which seems to amplify the
> buzz into the next room. Aside from the buzz everything else seems to
> have worked just fine for the last few weeks.
>
> The $64K question is how to stop the buzz? Any ideas?
>
> Lee
>
>
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