Delay on timer relay for AC power supplies

Hi,

Currently installing ac electrics and Mrs wants to be able to start the
genset before switching on the oven in the galley. Genset has a simple
add on board to remotely auto start when a single pole switch is made -
light switch - which will be installed in the galley. The AC power
system uses industrial contactor pairs to provide automatic switching
between supplies - shore, ac alternator, genset and inverter. See
basic diagram http://www.luxe-motor-kei.co.uk/documents/AC
Switching.pdf

The generator starts approx 12 seconds after the switch is made - after
glow plugs have done their stuff but of course if shore or inverter
power is already on the contactor coil remains energised and switched
to that power supply until switched off - which means Mrs S has to then
go and switch off shore or inverter supplies - which defeats the object
of the remote start!! The reason for switching off the shore supplies
is that in some areas only 4 - 6 A is available form the shore supply -
not enough for an electric oven.

I reckon that I need to let the genset run for a few seconds before
taking power from it. I was therefore thinking of using a delay on
timer to break the shore power and inverter contactor coil circuits 60
seconds after Mrs has made the genset switch, thereby switching the
generator power supply to the AC panel.

Any comments??

Colin Stone
www.luxe-motor-kei.co.uk

On 4 Feb 2006 16:03:58 -0800, colinstone.RemoveThis@hotmail.com wrote:

>Hi,
>
>Currently installing ac electrics and Mrs wants to be able to start the
>genset before switching on the oven in the galley. Genset has a simple
>add on board to remotely auto start when a single pole switch is made -
>light switch - which will be installed in the galley. The AC power
>system uses industrial contactor pairs to provide automatic switching
>between supplies - shore, ac alternator, genset and inverter. See
>basic diagram http://www.luxe-motor-kei.co.uk/documents/AC
>Switching.pdf
>
>The generator starts approx 12 seconds after the switch is made - after
>glow plugs have done their stuff but of course if shore or inverter
>power is already on the contactor coil remains energised and switched
>to that power supply until switched off - which means Mrs S has to then
>go and switch off shore or inverter supplies - which defeats the object
>of the remote start!! The reason for switching off the shore supplies
>is that in some areas only 4 - 6 A is available form the shore supply -
>not enough for an electric oven.
>
>I reckon that I need to let the genset run for a few seconds before
>taking power from it. I was therefore thinking of using a delay on
>timer to break the shore power and inverter contactor coil circuits 60
>seconds after Mrs has made the genset switch, thereby switching the
>generator power supply to the AC panel.
>
>Any comments??
>
>Colin Stone
>www.luxe-motor-kei.co.uk
Interesting!
Looking at your PDF one can assume where the C/O contactor coils are
fed from but at my age I never assume nothing!
After a quick look I cannot see why the genset does not have priority,
ie last in line. A delay on timer would possibly do what you want
though. .
A couple of points.
Do you have a full circuit diagram as opposed to the schematic?
I cannot relate to the inverters upstream of the breaker board on the
QSW side! What control?
From your photos, why are you switching the ground wires?

What a project!!!!

Richard

Nb "Pound Eater" Parkend G+S
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