EMS 50C

[one_dusty_hoot]

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, wrote:
>
>
> > 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
>