Re: All Windings Off setting, Camtronics 5A boards

Thanks Ray,

I'm going to investigate any coil to contact paths with a meter, then
try it out. Seems to work on 24v, and there were transformers and power
supplies in the "box". Many actuator/indicators also, a meter should
figure them out. Also four nice breakers, I haven't seen what current
yet.

There ARE three matching terminals for the L1,L2,L3. I'M not going to
do 3-phase.

Still wonder why they called on terminal N/C, and another N/O. There is
continuity BETWEEN them if I actuate the contactor. The names would
imply to me that there was a "common" pin somewhere, and NOT closure
between the contacts.

Alan KM6VV


Ray wrote:

>
> Alan
>
> From: Alan Marconett KM6VV <KM6VV@...>
>
> >Hi Ray,
> >
> >Yes! it DOES stay in when pressed, in fact, someone from the List had
> >to give me a hint how to reset the switch! I did a little lookup on
> >contactors, and I did come across "overload". Mine seem to be 24 VAC
> >(there was a transformer in the "box", and three circuits, L1,L2,L3.
> >also an NC/NO pair, which don't seem to connect to anything else, but do
> >close another circuit. There is a little lever on the Siemens
> >contactor, which closes the circuits as well.
>
> Sounds like three phase. The L1,2,3 are the feeds. There should be three
> like them across the bottom for the load. The transformer should be
> connected to L1 and one of the others on the feed side. You could probably
> tell from the primary on the transformer what voltage they were feeding it.
> The secondary side of the transformer should be the control voltage and
> would match the coil voltage.
>
> The control loop is from one side of the transformer secondary to the estop
> switch, the other side of the transformer through some overload contacts
> and to the coil. The last wire is from the estop switch opposite the
> transformer power to the second contact on the coil. Some contactors have
> wires from the coil to these other things or to intermediate screw
> terminals labeled 1, 2, 3.
>
> If I were trying to power my motors with it, I'd use the NC/NO contact to
> warn the controller that estop had been pressed.
>
> >Yeah, what we need is a PDA with Vector CAD, and a wireless internet
> >connection!
>
> And add a mini tkemc for interface to a shop full of lathes and mills all
> running the EMC.
>
> Ray
>
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