Mesa 5i25/7i76 + driver leadshine DM2282 digital

Hello everybody. we are migrating from parport to Mesa 5i25/7i76 but we are having some issues to move the motors. Regarding the motors we are using a digital drivers Leadshine DM2282 ( same as DM1182 ) acording to Leadshine the minimum driving timing are:

Step_Len: 2500
Step Space: 2500
Dir_hold: 5000
Dir_Setup: 5000

the problem we have is that if we use this parameters on Pnconf the motor doesn't move.
But if we increse this values to:


Step_Len: 4000
Step Space: 4000
Dir_hold: 6000
Dir_Setup: 6000

the motor start to move but not works properly
we were using leadshine's recommend values with a simple parallel port using stepconf without problem but now we don't know what is happening.
I've attached leadshine driver timing for reference.

has anyone any idea?

Thanks in advance.

How are the 7I76 outputs connected to the Leadshine driver? (common GND, common 5V or differential)

Can you post your hal and INI files?

Hi, attached there are Ini and hal files and in adition an image that shows how we had conected driver to 7i76. Don't pay attantion to dip switch in the image (it just an image taken from internet)
in addition I can tell you that 7i76 is powered from 5i25 ( 5v ) and we are using a 12v isolated source for vfield.

thanks in advance.

First thing I would is change the P term to 1000 (was 50)

The wiring looks correct but sometimes the differential outputs do not work very well with high input
current drives so it might be worth trying with common ground wiring (connect PUL- AND DIR- to ground instead of 7I76 outputs and leave the 7I76 dir- and step- outputs unconnected)

You might also verify that the 5V at the 7I76 is not less then 4.75V or so

Looks like you were caught by a PNCconf bug.
In you hal file for each axis change:
setp pid.N.maxerror .0005
to
setp pid.N.maxerror 0

Then in your ini file set the P gains to 1000

Ahh yes for metric .0005 pid.N.maxerror wont work (its ok for inches)

what is the P term? I though it was only for server motors. we are using stepper motors.

Thanks.

its set in a line like this in the ini file:

P = 50.0

this needs to be changed to
P = 50.0
P = 1000

Note that there is one per axis

The

setp pid.N.maxerror .0005

statements are in the hal file

They should all be changed to

setp pid.N.maxerror 0

I mean what is the meaning of P? what does it mean?

Thanks.

P term in the stepgen PID loop