Re: Automatic Generator cut in

[Frank Mc Alinden <fmcalind@xxxxxxx>]

Hi Mick
What  *i think* you would need is a security power supply (13.8v) with a
battery backup and this would be used for the control circuit to trigger
the mains /generator contactors via your viom relays..Iwould switch 12v dc
via the viom module and drive and slave 12v relay powered by the security
power supply ( mains rated contacts on the slave relays) located with the
mains / generator contactors....

The ups software would have to send a message to ha software to indicate
power restored to switch back to mains....can this be done ???

Frank
----- Original Message -----
From: Mick Furlong
To: ukha_d@xxxxxxx
Sent: Saturday, May 10, 2003 9:42 AM
Subject: RE: [ukha_d] Automatic Generator cut in


Frank

I think Mark's is a manual cutover ...

I know I can get an electric start generator (which I assume has a battery
to start it?) and I think you are right about needing some form of dry
contacts.

With regards the triggering I would hope to use the fact that the UPS knows
it has lost power and has communicated it to the server to initiate the
sequence via a viom maybe.

If I can get a gennie that has some sort of dry contact I think I can
figure
that bit out...how on earth do I get the contactors to cut over and back on
the return of mains power? I sort of lose it about there;)

Cheers Mick
-----Original Message-----
From: Frank Mc Alinden [mailto:fmcalind@xxxxxxx]
Sent: 10 May 2003 00:16
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] Automatic Generator cut in


Hi Mick
I did a generator autostart for a Security Company a few years
back but cant remember exactly how it was done.....

Mark Mc Call has a generator set but im not sure if his starts
automatically ......

I would imagine the generator would obviously have some dry contact input
to start initiate a startup sequence and a standby battery to start
it....it
would be  triggered by a phase failure relay and maybe a timer....which
monitors the mains.....

You would also need contactors to switch the load between mains supply +
generator supply....Should have kept the schematics ;-((

Frank


Frank


----- Original Message -----
From: Mick Furlong
To: ukha_d@xxxxxxx
Sent: Saturday, May 10, 2003 8:24 AM
Subject: [ukha_d] Automatic Generator cut in


OK something on topic for a change;)

Scenario is as follows.....

Generator in outside boilerhouse

3xUPS (one with interface to Server PC) inside main house running some
lighting and some computer/networking kit.

Every imaginable cable type running between the boiler house and the
main
house and a duct to run more if needed.

Questions are...
How do I get the generator to autostart if there is a mains failure?
Do I need a special generator (I haven't picked one yet)?
I believe the wiring needs to be isolated from the mains when the
generator
is running how do I do this automatically?
How do I get the system to cut over to the mains once the power is back?
Finally how do I do all of this on a reasonable budget?

Thanks in advance for any ideas
Mick






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