Fehlmann Picomax 100 Retrofit

Your PWM setup is not correct for the 7I97, these are the correct settings:

# ---PWM Generator signals/setup---
setp   hm2_7i97.0.pwmgen.00.output-type 1 #PWM pin0
setp   hm2_7i97.0.pwmgen.00.offset-mode 1 # offset mode so 50% = 0

 

Thanks I‘ll give it a try.
Made this Hal a while ago, and now not sure if I modified my lathe file or used another base to start.

Scale is not finally set, cause I don’t know it yet, after I switched from glasscales to encoder feedback.

But wrong direction of scales usually results in a runaway axis…

I measured all the axis and corrected all input and output scale parameters, so they should be right.
and PCW was right... All my other hal files use the same settings he mentioned, so I adjusted them.
but Ist didn't fix my problem in total.
It's still oscillating, but I can jog now.

Might be time to have a look here, skip the wiring section:
forum.linuxcnc.org/10-advanced-configura...ning-detailed-how-to

Hi, I know this tuning tutorial and used it before, my problem is.
My servo system is oscillating right away.
Even with 0.00001 Deadband and P at 10.

When using a potentiometer for as analog input the servo runs smooth ans stable.

Sot it something that comes in interaction with linuxcnc.
Maybe the PID from the drive and linuxcnc don't work well together.

The oscillation range is +- 40 increments,
but there is something else odd,
the DRO is running at a different scale than the encoder position.

 

Are the encoders rotary or linear encoders?
Is the analog out scale set for full speed (in machine units per second) at +10V?
(if not, the units for FF1 and P are unknown)

I would get the encoder and analog scaling right,
FF1 right and then worry about fine tuning