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+--- Forum: WanderlodgeForum (/forumdisplay.php?fid=63)
+--- Thread: EMS 50C (/showthread.php?tid=4555)
EMS 50C - truitt44@...> - 03-26-2007 13:10
Bob,
When I start to crank my generator or shut the generator
down should the selector switch be in the off position.
And would the same hold true when connecting and
disconnecting shore power.
Howard Truitt
Camilla, Ga.
86 PT40
>
> From: "one_dusty_hoot"
> Date: 2007/03/26 Mon PM 08:49:07 EDT
> To: WanderlodgeForum@yahoogroups.com
> Subject: [WanderlodgeForum] Re: EMS 50C
>
> One of the strongest and most common sources of
> high voltage spikes is from inductive kickback when
> voltage is removed from a motor or relay or coil or
> an inductive load. External causes would include
> lightening or large power equipment or loads changing.
>
> Consider the automotive spark ignition, as points
> open the coil field collapses presenting a hi voltage,
> in thousands of volts jumping the spark plug gap.
>
> This same principle hold true in our coach relay coils
> as a switch or contacts open. Many times you can notice
> a spark when this happens under the right conditions.
> Automotive relays sometimes have a small diode in
> parallel with the coil to shunt this high voltage.
> Sometimes a small capacitor is placed across the switch
> contacts to do the same thing much the same as the
> condensor was placed across the ignition points to
> prevent them from burning. Just look at all the
> relays in a coach, my goodness.
>
> If I use the manual transfer switch I like to do so
> when connected to the least systems or components. The
> same thing holds true for contacts there arching when
> a load is switched or removed.
>
> For the ATs it would not take the care that you or I
> would removing the load before activation, it just
> switches, when certain conditions are met. All the
> more reason to have the EMS downstream of the ATS.
>
> I don't believe it beneficial to have the EMS on the
> generator side before th transfer switch either. Why
> not mount between the transfer switch and the main
> panel?
>
> bob janes, 87fc35, greenville, sc
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> --- In WanderlodgeForum@yahoogroups.com,
> >
> >
> > > Ralph,
> > What little I know or understand about electricity will fit on the
> head of a nano needle.
> > As I previous stated I think our greatest exposure to a possible
> bad power situation is at the post in the parks. If the post checked
> ok why not plug the cord to the post and then plug the cord to the PT
> 50 to check the cord. For those who still have worries about the
> generator install a hard wired unit on the generator output before it
> connects to any transfer switches. This set up with the portable and
> hard wired unit would cost about $600.00 for the two units. Do the
> portable now and the hard wired one to the generator next year. Still
> some cheap insurance.
> > Question; What if you are in a park that only has 30 amp service.
> How would this work then would you then need PT30 or will the PT50
> read the 30 amp ok.
> > Howard Truitt
> > Camilla, Ga.
> > 86 PT40
> >
>
>
>
>
EMS 50C - one_dusty_hoot - 03-26-2007 15:41
Howard,
Personally I believe it a good practice to
always turn off when starting or stopping
the generator. On shore power, I do the same
but the load on switching is the transfer switch
contact killer for generator or shore. Set
the position with as small a load as possible.
The charger can use a lot of current especially
if batteries are low and not switched off.
bob janes, 87fc35, greenville, sc
--- In WanderlodgeForum@yahoogroups.com,
>
> Bob,
> When I start to crank my generator or shut the generator
> down should the selector switch be in the off position.
> And would the same hold true when connecting and
> disconnecting shore power.
> Howard Truitt
> Camilla, Ga.
> 86 PT40
> >
> > From: "one_dusty_hoot"
> > Date: 2007/03/26 Mon PM 08:49:07 EDT
> > To: WanderlodgeForum@yahoogroups.com
> > Subject: [WanderlodgeForum] Re: EMS 50C
> >
> > One of the strongest and most common sources of
> > high voltage spikes is from inductive kickback when
> > voltage is removed from a motor or relay or coil or
> > an inductive load. External causes would include
> > lightening or large power equipment or loads changing.
> >
> > Consider the automotive spark ignition, as points
> > open the coil field collapses presenting a hi voltage,
> > in thousands of volts jumping the spark plug gap.
> >
> > This same principle hold true in our coach relay coils
> > as a switch or contacts open. Many times you can notice
> > a spark when this happens under the right conditions.
> > Automotive relays sometimes have a small diode in
> > parallel with the coil to shunt this high voltage.
> > Sometimes a small capacitor is placed across the switch
> > contacts to do the same thing much the same as the
> > condensor was placed across the ignition points to
> > prevent them from burning. Just look at all the
> > relays in a coach, my goodness.
> >
> > If I use the manual transfer switch I like to do so
> > when connected to the least systems or components. The
> > same thing holds true for contacts there arching when
> > a load is switched or removed.
> >
> > For the ATs it would not take the care that you or I
> > would removing the load before activation, it just
> > switches, when certain conditions are met. All the
> > more reason to have the EMS downstream of the ATS.
> >
> > I don't believe it beneficial to have the EMS on the
> > generator side before th transfer switch either. Why
> > not mount between the transfer switch and the main
> > panel?
> >
> > bob janes, 87fc35, greenville, sc
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > --- In WanderlodgeForum@yahoogroups.com,
> > >
> > >
> > > > Ralph,
> > > What little I know or understand about electricity will fit on
the
> > head of a nano needle.
> > > As I previous stated I think our greatest exposure to a
possible
> > bad power situation is at the post in the parks. If the post
checked
> > ok why not plug the cord to the post and then plug the cord to
the PT
> > 50 to check the cord. For those who still have worries about the
> > generator install a hard wired unit on the generator output
before it
> > connects to any transfer switches. This set up with the portable
and
> > hard wired unit would cost about $600.00 for the two units. Do
the
> > portable now and the hard wired one to the generator next year.
Still
> > some cheap insurance.
> > > Question; What if you are in a park that only has 30 amp
service.
> > How would this work then would you then need PT30 or will the
PT50
> > read the 30 amp ok.
> > > Howard Truitt
> > > Camilla, Ga.
> > > 86 PT40
> > >
> >
> >
> >
> >
>