SV stall error

[Samandkimberly]

Thanks for your patience, Tom. I *think* I’ve tried all the permutations you suggest and I’m still nowhere:

- I’ve reversed the polarity on two of the three motors and the symptom doesnt change. (I have not verified that the motors did reverse direction which I will tonight, but I cant see how they wouldnt)

- I’ve assigned the drives according to the documentation. Here is a screenshot:

..and a check that they are addressed correctly:

And, I’ve verified encoder direction, rough calibration and proper x/y/z locations Here is a screenshot after me spinning each acis drive ~1 revolution CCW. X does move as I move the X motor, Y does move with Y and Z with Z. (They are all sitting in their locations, disconnected from the machine)

I think you’re suggesting the right places to look, but I’ve looked there. What next?

Thanks for bearing with my learning curve,

Sam

[Samandkimberly]

@ Marty - report posted above is from 2 days ago and should be unchanged. I can generate another this PM, to be sure.

Sam,
Use the Utility function to generate a report and post it here.

Marty

[tblough]

Also, set P19=0 and see if that has any effect on the MPG1 errors.

[martyscncgarage]

I have only done two All in One DC retrofits so far.
In the case of a runaway initially, all I did was reverse the motor power wires on All in One DC, that took care of the run away. Next step then was to check for proper motor rotation. (Assuming your encoder was counting properly per the All In One DC Installation Manual)
Here is the Centroid Tech Bulletin 137 that discusses that: http://www.centroidcnc.com/dealersuppor ... ds/137.pdf

In this video I shared my "Runaway" Experience:
https://youtu.be/dVsfFIgyLt8

In your initial post: "I hit MDI and both x and z motors spin for a split second then the Main relay kicks in:"
What you meant to say was the Estop relay kicked OUT (opened due to a fault)

It seemed your X and Z motors ran away, control caught it and faulted.
I would have reversed the motor power wires for X and Z on All in One DC and tried again.
If then the motors held, then I would have tried to jog each axis to see if the motors were turning properly.
(assuming you setup base PID values for your motors)

If the motors were turning ok under CNC software control. Then I would have continued on with the installation. If the motors were OK under CNC software control but turning the wrong direction for the machine, I would follow TB137 to correct that. NOTE THE CHANGE OF THE LIMIT SWITCH WIRING/INPUT ADJUSTMENTS.

[martyscncgarage]

Also where did your encoders come from? Centroid?
What brand/model are your servo motors?

[Samandkimberly]

Hi Marty -

Centroid encoders, Milltronics/SEM DC motors.

MPG error resolved.

Encoder counting properly per manual.

Reversing motor power leads results in similar fault.


Right now, the only hypothesis I have to work on is that with me running unloaded motors at more than 20% over voltage, I may be creating a situation where the motor is accelerating faster than the PLC is picking up the encoder count.

Any other ideas?

[martyscncgarage]

Hi Marty -

Centroid encoders, Milltronics/SEM DC motors.

MPG error resolved.

Encoder counting properly per manual.

Reversing motor power leads results in similar fault.


Right now, the only hypothesis I have to work on is that with me running unloaded motors at more than 20% over voltage, I may be creating a situation where the motor is accelerating faster than the PLC is picking up the encoder count.

Any other ideas?

What is the model of the SEM motors? Did you use the All in One DC Install manual to setup the baseline PID values for those motors?
Are you trying to reuse the original encoders? If so, what make and model are they or do you know?
I'm concerned about whether or not you are using encoders that are suitable for All in One DC.
Marty

[Samandkimberly]

Marty - The encoders are new, purchased from Centroid. 2 of the motors are painted over, but the original documentation indicates they are SEM 26”lb model MT30m4-38, and the other is a similar 40 “lb unit. They worked fine before, but the system voltage has always been 20% too high. I’m using the PID settings in the manual and becoming increasingly suspicious those are the problem in this case. But I’m going to bring the voltage down to the motor spec before I do anything. New transformer arrives on Friday.

Sam

[cncsnw]

Sam,

Please try to avoid reporting things like "I changed ____, and the symptom did not change". That requires that we read back through two weeks' worth of posts, wherein you report multiple different issues, trying to figure out what the remaining symptoms are. Instead, in today's post, try to tell us concisely but clearly what is happening today.

Now:
Release emergency stop; do not press F3/MDI; and just select Slow, Continuous jog mode.
Try jogging each axis in turn.
If you get a runaway and a stall message, then press and release emergency stop to clear the fault, and proceed to try the next axis.

Do any of your three axes jog under control, without error?

For those that run away:
If you trigger it by pressing the Plus jog button for that axis, which direction did the motor spin (as judged facing the business end of the motor)?
In what direction did the encoder count, as the motor spun in that direction?

[Samandkimberly]

All three run away.
All three rotate clockwise.
And, if I look up the encoder values all three are showing negative values.

Thanks,

Sam