Hi Jon;
Responses and questions below:
On Sat, Nov 27, 2010 at 12:39 AM, Jon Elson <[email protected]> wrote:
> Don Stanley wrote:
> > Hi Jon and All;
> > My configuration is:
> > -D510MO computer
> > -Ubuntu 10.04 Live Disk
> > -EMC2 2.4.5
> > -USC with univstep reconfigured for mill.
> >
> > The USC works fine in non servo mode, (Switches down).
> > When I switch to servo (switches up) none of the three servo axis
> > will move.
> >
> OK, this is not ALL switches up. Switch # 1 set to ON changes the first
> axis
> to be closed-loop. Switch #2 affect the second axis in this way, etc.
>
The first three switches are up (ON) for X,Y and Z axis to servo mode.
The forth switch is down for A axis non servo. Switches 5-10 are ON
>
> Now, when you move the motor manually, you should see the DRO position
> display
> change on the screen. If it doesn't, then something is wrong with the
> encoder connection,
> probably.
>
Manually moving X,Y,Z changes the DRO position in the correct
direction and amount.
>
> Note that switches 4-7 change the step/direction output to phase
> output. if you feed this to
> a microstepping drive step/dir, the moves would be constantly changing
> direction every 2nd
> (micro) step, and might appear to not be moving at all. I'm guessing
> that may be what
> you have done.
The 5-8 switches are up (ON) for servo and non servo. My micro stepping
Drivers only need more steps with direction to do the micro step moves.
If not, then we will have to investigate further.
> Other than making sure INPUT_SCALE has the right sign and scale
factor for your encoder, nothing in your .ini file needs to change.
> (I believe I previously told you that input scale and output scale need to
> be
> the same. I think that's wrong, OUTPUT_SCALE needs to be either +1.0 or
> -1.0, whichever sign doesn't cause a servo runaway.)
In the .ini file the servo mode input-scale = 5085 and output-scale = 1.
I have switched modes many times trying to get a clue of this problem.
> Sorry about the confusion on this,
> not too many people
> use this feature. But, it does work, I use it to test out my Gecko
> interface board.
>
> On a 3-axis closed-loop machine, you want switches 1-3 on, 4-9 off, and
> 10 on for the first USC board.
>
With my Step and Direction micro stepper Drivers, my switch configuration is
all switches ON (UP) except switch 4 OFF for the A axis, in non servo mode.
Do I need to change this?
Is it possible the USC requires switches 5-7 OFF (DOWN) to produce output
when switches 1-3 are ON for servo mode ?
Being unfamiliar with Gecko drives, I am not clear what switch 9 does to the
step and direction timing or waveforms. Does the direction stay constant
while steps continues, for a given direction, or do both pulse during the
move?
Thanks for your help
Don
>
> Jon
>
>
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