Re: Complicated Napco MA2600 Internals Issue

["I brive a dus" <alarminstall@xxxxxxx>]

On Feb 27, 12:44 am, "Katie Wasserman" <katie10...@xxxxxxxxx> wrote:
> I've been reading some of the expert posts here and I know that you're
> the right group for this one.....
>
> I have a Napco MA2600 system in my house and find that it generates a
> lot of RF noise from below 300KHz up to 2MHz.  Bad enough for
> listening to AM radio but I recently got interested in ham radio and
> that makes the problem much worse.   The RF noise is coming not just
> from the AC line but from all the contact wiring throughout the house
> so it's not easy to get rid of.
>
> My solution is to shut down the alarm system completely and although
> this works it's a pain to bring it up and down so I've set up a system
> to do that remotely.  The "system" is a remotely control relay that
> cuts off the low voltage AC into the control panel and simultaneously
> the 12V battery supply.  The cutoff function works great!  But when
> the system powers back up it sets off the alarm unless the AC is
> applied first followed by a delay of a few seconds then the 12V
> battery can be connected up.
>
> I suppose the I could ehnace my relay circuit to add the needed delay,
> but I just assume not even bother with the 12V battery and run the
> system without that.  Of course you can't just pull the battery on
> this system since the controller is busy with alternately charging and
> checking it all the time and if it finds it's not there it won't let
> you arm it.  There's no detail on the charging/checking battery system
> in the manual.  If I had a schematic I'm sure that I could figure it
> out but finding one seems to be an impossible task.
>
> So I'm looking for ideas along the lines of one of these, or maybe
> something entirely different.
>
> 1)  There's obviously an "AC power good, ready to accept 12V battery
> voltage" signal somewhere in the panel.  If I can access that point I
> can use it to control the relay for the 12V battery and not use a
> fixed (and unreliable) time delay.  Where is it? There's some mention
> of an optional PS3002 power supply that hooks into the control panel
> through lugs E7 an E18.  Could one of these be the point that I'm
> looking for, I haven't done any circuit probing yet.
>
> 2)  Faking out the battery check with a dummy battery of some sort
> doesn't seem to be a workable solution, since if it really thought the
> battery wasn't  there when the AC power was applied it would set of
> the alarm. Turning off the battery check completely seems like it
> would work but I have no idea how to do this.
>
> 3) Find some magical way to eliminate the RF noise.
>
> 4) Throw the whole thing out and buy a different system.
>
> Thanks,
>
> Katie

It could be time for you and Paul to check out some new headphones.