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Pgain and ff1 and deadband are parts of the remora stepgen and used to tune motor control/feedback. feedback control has nothing to do with encoders or input from the motor. it is an internal math shit connected to the stepgen to tune motor position control like you would a servo.

regular stepgen and DMA stepgen have no difference in LinuxCNC. The same concept as inputs applies to the stepgen/dma stepgen. In the Config.txt you tell the MCU that pin P1_22 and P1_17 is step and direction of joint 0, which is remora.joint.0 which is connected to LinuxCNC joint.0

The DMA stepgen is a faster hardware based stepgen and requires dedicated hardware pins. LinuxCNC does not know if you are using DMA stepgen or regular stepgen and it does not care.

Looking at the EC500 DMA stepgen config, we can apply the same concept to the NVEM config.txt The config.txt for your specific board, and is just a way to tell the remora what pins do what. The default stepgen is regular stepgen because it is less to tune. If you want to change your stepgen to DMA stepgen, lets compare the config.txt DMA stepgen and apply it to the NVEM config.

 

If there are no hardware conflictions (there arent in this case) we can go about changing the stepgen to DMA stepgen. In this case the pins are the same for both boards. so replace your entire stepgen with the DMA stepgen and make sure the pins match the pins on your board

 

The config.txt file tells the MCU which pin is going to do what. so Pin P4_20, the imxrt1052 MCU pin, is assigned the title of remora input 06 . when pin P4_20 is triggered, the MCU tells remora that remora.input.06 is triggered.
Not to confuse things and its hardware restrictive, but you can make "remora input 06" to be whatever pin you want it to be, it doesnt matter what pin is input 5 or 6, but it has to match up.

The remora.hal file connects remora pin remora.input.06 to LinuxCNC pin joint.0.home-sw-in (this is the x home switch) So when pin P4_21 is triggers, it tells remora that remora.input.06 is triggers, which triggers LinuxCNC joint.0.home is triggered (x axis homing pin)

the remora.hal and LinuxCNC do not know if you have an NVEM or an EC300 they do not need to know and they do not care.

3-phase power, in all its greatness, is something of a headache.

(not for induction motors obviously)

Whoa, hold up.

Households in Austrailia use 415VAC?!

(little kid): "Hey daddy, what's this? ...kzapp! [kid gets electrocuted]"

spincycle wrote:

I assume the procedure is similar for newer drives if running analog?

Yes.

spincycle wrote:

I would tune the velocity/torque in the drive software, then tune position through Linuxcnc.

Yes.

spincycle wrote:

It looks like a few of the modern servo drives I've looked at have encoder outputs. Those will just run back into a Mesa card like the 7I97?

Yes.
3 for 3, nice!
New drives can also be controlled by step/dir and also have encoder outputs, and those can again be used in LinuxCNC.
And there are several boards from Mesa that can be used, not just 7i97, a lot of combos there so when you are ready to order stuff, ask here first as we have the Mesa Master with us here, always, in the form of PCW.

"why you take some files from this path?"

If that question was asked of me, it took me a few to figure out what you might of been referring to. If it was this post here - www.forum.linuxcnc.org/18-computer/44828...rd?start=2180#327765 - then that is my fault completly as I was at the wrong place when I copied the link. My bad. Just went back and edited it. Looks like the difference is in the DMA version there is an additional line in the motor config -

setp remora.joint.1.pgain [JOINT_1]PGAIN

- that is not in the basic and not what I am currently using. I believe you said it, it's confusing, and yes, it would seam I have fallen head first into that confusion.

Bad Spyderbreath for adding more mess to the pile.

Alright its starting to look like the inmates are running the asylum. Everyone just hold on for a moment, breath in and out, and cool our heads. I know english or linuxcnc isnt everyones first language, but it looks like everyone is working off each others confusion, and you guys are spiraling out. I think there are some core concepts we arent all understanding completely. Its clear that you guys are smart people, so lets hold on for a moment and regroup, and always read the manual. If you atre getting frustrated, just start from page one and read. If there are things getting lost in translation on the documents, letting us know would be great, and we can change some of the wording. I know the docs arent perfect, but the core concepts are the same for the whole of remora.


Also, if its a remora specific question, it is best to ask in the thread. remora isnt really a big wide linuxcnc thing, it makes it harder to find your thread.

cakeslob wrote:

if it is stepper timing related you need to load the DMA stepgen config and adjust your step timing accordingly

I don't understand well,
I have to load all from:
github.com/scottalford75/Remora-RT1052-c...CNC/remora-ec500-DMA
and upload this to NVEM:
github.com/scottalford75/Remora-RT1052-c...ec500-rt1052-DMA.txt

Today I tried the updating progress and V16 was loaded.
Unfortunately the key matrix now doesn't seem to work anymore at all. I didn't have time to check with the scope but it looks like there is sth. general wrong now?
I checked with the meters in linuxcnc and the buttons that worked before aren't recognized anymore, as well as the buttons that didn't work before.
I am not sure if i measured that right but I checked with linuxcnc scope and I did not get a trigger on a changed keycode of the 7i73.
I counter checked to check general device integrity by checking analog values - they are still transmitted.

it does not change, it still homes in the same direction. only flipping the positive and negative in the table length changes the direction.

Hi Langdons,

Yeah definitely affordable!

We run 415v 3ph in Australia. Weirdly enough there isn't a huge amount of aliexpress drives that cater to that voltage.
Inovance, Leadshine and Delta do however offer 400v stuff which is nice.

Thanks Tommylight.

I had a good read through your tutorial last night. Very informative.

Unfortunately it's the servo drives that are busted in my machine. I assume the procedure is similar for newer drives if running analog? I would tune the velocity/torque in the drive software, then tune position through Linuxcnc.

It looks like a few of the modern servo drives I've looked at have encoder outputs. Those will just run back into a Mesa card like the 7I97?

Rune_cnc:

Yes, your picture with the NPN sensor and 2.2K pullup to +24V is correct.

hermann1976:

The 7I96/7I96S can work without resistors with PNP or NPN sensors.
This is because they have a floating common pin for their inputs so can
sense either a connection to positive (PNP)  or negative (NPN) voltage
relative to  this floating common pin.

The 7I76/7I76U does not have a floating input common pin so can only
sense positive voltages. Since NPN sensors do not output a positive
voltage, but just a sense dependent connection to ground, an external
resistor must be  added to pull the NPN sensor output to a positive level.

 

Will do in the a.m. Thanks!

github.com/scottalford75/Remora-RT1052-c...CNC/remora-ec500-DMA

why you take some files from this path?