Re: Anyone know how to revive an AD10

["derekclydesdale" <derekclydesdale@xxxxxxx>]

Keith,

Thanks for the advice.

I have turned the power on and off, disconnected and re-connected
the supply, and finally resorted to taking the damn things apart.

As far as I know, the supply was low for a few hours.

It appears that as you say, one or both coils on the relay have
burnt out.  One unit is dead completely, and with not toggle on or
off, whilst the other will toggle on, but not off.  The covering
over the relays has melted, indicating an over-current situation.

So, it looks like they will need replaced.

To be honest, I am a bit dissappointed with how this has happened.
The fact that both units failed so completely, does not say much for
how they have been engineered to cater for fault conditions.  I
mean, everything else in my house appears to be suffering no ill
effects, whereas the units bought to control mains, cannot cope with
a problem with the mains.

Cheers

Derek

--- In ukha_d@y..., "Keith Doxey" <ukha@d...> wrote:
> MessageHi derek,
>
> Probably too stupid a comment but .....
>
> in your original message you say the voltage was low and that it
later
> resumed to normal.
> Did the power go completely OFF at any time?
> Have you turned the power off at the mains ?
>
> If the answer to both the above is no, then there is a possibility
that they
> have just locked up and are refusing to respond.
>
> If you have already done that and they still dont work then it is
possible
> that the relay coil has burnt out. The modules have a mechanically
latching
> relay which only required power to change state. The module senses
the state
> of the relay and if it is in the wrong state will pulse it to set
it to the
> correct state. That is why appliance modules sometimes chatter.
>
> If the module was confused by the low voltage it could have
energised the
> relay for a long period of time and burnt it out. There is another
slim
> possibility, the info on modifying 120V module to 240V includes
putting a
> resistor in series with the relay coil to prevent the 240v from
burning out
> the 120v relay coil. Depending on how X10 have made these 240v
modules there
> are two possibilities
> 1. They have used a 240V relay in which case it may well be dead.
> 2. they have used  the same relay as in 120v modules but fitted a
resistor
> in which case the resistor could be fried.
>
> The resistor (if it exists) could easily be replaced. The relay
would
> probably be imossible to source. Having said that, if the relay is
the
> fault, there is almost certain that an Applance Module would use
the same
> relay as the AD10. Appliance modules are considerably cheaper than
DIN
> modules so it could be a donor for a transplant.
>
> Let us know how you get on..... and be careful :-)
>
> Keith
>   -----Original Message-----
>   From: Steve Morgan [mailto:steve@xxxxxxx...]
>   Sent: 01 February 2002 17:11
>   To: ukha_d@y...
>   Subject: RE: [ukha_d] Anyone know how to revive an AD10
>
>
>   The one that's stuck on: try flicking the override switch on and
off
> several times - it's possible the contacts have welded together
but they can
> usually be freed up with some persistence.
>
>   Steve
>
>   -----Original Message-----
>   From: Derek Clydesdale [mailto:derek.clydesdale@xxxxxxx...]
>   Sent: 01 February 2002 14:54
>   To: ukha_d@y...
>   Subject: [ukha_d] Anyone know how to revive an AD10
>    <snip>
>     However, my AD10's are buggered.
>
>     One, which controls the heat, and was probably "on" at
the
time the
> voltage dropped, is now permenantly "on" all the time. 
Neither
sending X10
> commands or using the over-ride switch to force it off will work.
>
>     The other, which was "off" at the time, is now
permenantly
off, and like
> above, cannot be forced on.
>
>     I have tried applying mains to the momentary contact or toggle
inputs to
> see if that works - but no joy.
>
>     I opened one to see if there is any visible damage, but it
looks fine.
>
>     Any ideas how I could fix them?
>
>
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