Re: [CAD_CAM_EDM_DRO] Re: Help - G340 problem ?

ftomazz wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "deanc500
><deancouillard@s...>" <deancouillard@s...> wrote:
>
>
>>Hi, sounds like either there is a problem with the encoder, or there
>>is electrical noise on the ground circuit. If can try another motor,
>>see if you can rule out the encoder. Be sure the +, -, A , and B are
>>correctly wired.
>>
>>
>
>I've double checked.
>
>Are you powering the encoder from the Gecko or from a
>
>
>>separate 5V supply?
>>
>>
>
>>From the Gecko.
>
>
>But I don't understand that if I put step and dir to ground or to +5V,
>one of this configurations should simply stop everthing. Even if the
>encoder is damaged ? Or no ?
>
>

No. The Gecko will always attempt to zero the error between actual
position and commanded
position. It starts up with an offset of 1 count, I'm guessing, and
tries to move to reduce
that error. It is clearly not getting encoder feedback, so it continues
increasing motor speed,
but the error never gets any better.

You will have to find out why the encoder is not working. Disconnect
the motor wires, and
check if the encoder A and B signals change between roughly zero and +5
Volts as you very
slowly move the motor by hand. These signals should abruptly change
from near zero to
near +5 V and not be anywhere in between (although they may hop rapidly
between the two
when positioned right on the edge.)

Jon