Re: Slight Servo Problem

> Hmm... I guess you should open up the Gecko box and make sure the
> anti-dither mode is activated on that Z drive. I think that means

the

> jumper
> should be missing in that location.
>
> The other possible problem is feedback on the encoder wires. Do

you have

> the encoder wires strapped to the motor wires? That is not a good

idea,

> as the
> Gecko drives send a lot of fast rise-time pulses out the motor

cable.

> You likely
> need shielded cables for the encoder, if you aren't using them.
>
> Do you have the same number of steps (encoder counts) per inch for

all the

> axes? Does the axis still buzz when in estop-off mode (assuming

EMC is

> the control program, you don't say)? There are some combinations

of

> resolution that cause a lot of hunting of the simulated servo in

freqmod,

> and a deadband setting of about 1-2 encoder counts helps immensely.
>
> Jon

Hi Jon,

Thanks for the reply. The control program is Turbocnc for now and
the problem is still there at all times, even with the computer
turned off. The encoders are all the same, 250cpr and the Geckos
step multiplier is set at 5x. The encoder wires are bundled with the
motor wires but I am using sheilded wires and it hasnt picked up or
lost any steps so far. I know this is a common problem but I got
lucky here.

I'm assuming that deadband is a neutral region where the controller
doesnt try and correct position right? If so then this makes sense
and would probably help it. How would you go about changing the
deadband on a Gecko 340?

I'll try swapping motors and drives and see if the problem stays
with the drive or the motor and go from there. May take me a week or
so to do this though. I have some work lined up that needs to be
done first. Thanks again.

Mark