Re: [CAD_CAM_EDM_DRO] Potential relay strangeness

Lee,

Actually I'm referencing the potential relay off of one of the
hot legs of the single phase input as shown in the second drawing
down at:

http://gwm4-3phase.com/static1.htm

I thought about using the dual-primary but didn't know what xformer
to use. What are you using? I think the problem may that the voltage
difference coming through from somewhere to keep the potential relay
energized although that doesn't explain why it works when the input
switch to the converter is used.

Now, I'll be the first to admit that I really don't know what I'm
doing so here's a LAG (lousy ASCII graphics) schematic of the way I
have things wired for now.

o--------------o-|\|--o-----o-------o------ T3
| \ | |
| /__ PR | |
| /_ | |
--- | --- |
Cs _ o Cr1 _ |
/|\ | /|\ |
| | | |
L2 ---------------o------------------ ) ------o------- ) ---- T2
| |
| ---
| Cr2 _
| /|\
| |
L1 ----------------------------------o----------------o------ T1

Cs is the start cap, Cr[12] are the run caps. PR is the potential
relay.

To be honest, I'm suprised that the thing works as well as it does.
Anyone have any ideas why I can switch L1/L2 and have things work
and have things not work when I switch T1/T2/T3?

Drew

On Oct 2, 8:04pm, Lee Studley wrote:
> Subject: [CAD_CAM_EDM_DRO] Potential relay strangeness
>
> I copied this to a new thread in hopes it
> might be of use to others:
>
>
> Drew,
> Those are the 2 documents I'm going off of also.
>
> Thats an interesting point on the motor switch.
> If the 3rd 'derived' phase is disconnected, the
> potential relay (normally closed) should be closed
> automatically(connecting the start cap) until the the 3rd leg is
> reconnected and up to speed/potential. Are you sure you dont have
> the common coil/contact swapped somehow? In the diagram for the
> rotary convertor it is reversed from that of the static, since a
> 'slave' contactor is being used. Also, where are you referencing
> the other side of the coil for neutral? I went with the dual-primary
> tranformer centertap. Then I can have an aux low voltage supply
> for an RPM meter and monitor etc.
>
> Let me know what you find,
>
> -Lee
>
>-- End of excerpt from Lee Studley



--
Drew Rogge
drew@...