Re: [CAD_CAM_EDM_DRO] Re: Trak cnc 2 control replacement

seb fontana wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
>
>
>>seb fontana wrote:
>>
>>
>>
>>> Jon
>>> OK, we be making progress! I don't have to use both,
>>>
>>>
>just the one thats recomended to work with what ever control/software
>I end up getting..Probably the ones on motors as thats the talk seems
>to be about...I can power it, so how do I check which wire does what?
>The black and white wires I think [oh no!]are power cause where they
>attached is sepparate from the other 4; the orange, red, green and
>purple wires..So, how to check for sure? Seb.
>
>
>

Use a voltmeter. You should be able to find a wire that has zero volts
difference from frame ground all the time. That is going to be the
ground wire. Then, find a wire that has, presumably, something like
+5 V or +12 V all the time, and that should be the power supply.
Sounds like you have located these, just need to tell which is which.

Then, while turning the motor by hand very slowly, see what you get on
the other 4 wires. It could be just A and B quadrature with differential
signals, or it could be something like A, B index and fault. The A and B
(and their differential complements) should have a regular pattern of
alternating high and low between two voltages. It may be hard to
determine this with a voltmeter, as they may change state with extremely
small movements of the motor. An index signal will pulse just once per
revolution for a very small distance.

Jon