Re: Encoder question?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "fortino" <fortino_tan@h...>
wrote:

> Hi,
>
> Is there any way to know which cables go to + , -, Channel A,

Channel A-,

> Channel B, Channel B- in encoder?
>
> Fortino

If your encoder has the following colors:

RED
BLK
The red is usually +5 and the Black neg 5 (gnd)

With those connected up you can use a scope to determine the polarity
of the pulses. A- and B- would indicate a differential encoder. If
you are using a Gecko, use just the A ,B +5 and Gnd leads. If two of
the colors are blue and yellow, suspect them as your A and B. It
doesn't matter if you use A and B or A- and B- as the signal pins as
long as you have the separate channels. You don't want to use A and
A- or B and B- as the two signal wires. As long as the voltage is
hooked up correctly you can experiment with the Channel wires. If
you can hook up the Gecko on a bench supply with the motor and
encoder then you can get a good idea of what will work. Properly
connected encoders should hold the motor locked (with no step signal
to the Gecko and resist your trying to turn the motor shaft. There
may be a slight "twitch" occasionally as the circuit jumps between
encoder counts. If the hook up is wrong it will not correct in the
right direction and possibly "run away". Hooking up the encoders
wrong on the bench will not hurt the Gecko. (power off each time you
make a change)