Re: Re: All Windings Off setting, Camtronics 5A boards

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