Search found 360 matches

by ashesman
Wed Sep 21, 2022 3:26 pm
Forum: Centroid Oak, Allin1DC, MPU11 and Legacy products
Topic: CONFIRM ENCODER COMMUNICATION
Replies: 16
Views: 745

Re: CONFIRM ENCODER COMMUNICATION

Good find. Yes you definitely want the drives logic powered all the time. Same as the spindle VFD only cut the main power supply to the drives with estop contactor. I had made some assumptions that all the wiring diagrams would have been drawn like that as it makes no sense to power down the logic s...
by ashesman
Wed Sep 14, 2022 3:17 pm
Forum: Centroid Oak, Allin1DC, MPU11 and Legacy products
Topic: Quadrature Error
Replies: 10
Views: 395

Re: Quadrature Error

There is the possibility that there is an issue with the hardware on the Oak. Maybe a dicky power supply or something not happy in the drive interface part of the board. I am not sure how common or likely this is but dont rule it out. Another option would be do do an absolute bare bones bench test s...
by ashesman
Thu Sep 08, 2022 3:41 pm
Forum: Centroid Oak, Allin1DC, MPU11 and Legacy products
Topic: Quadrature Error
Replies: 10
Views: 395

Re: Quadrature Error

The * in the PID screen indicates the Z feedback signal to the Oak is active. It should only be active once per revolution for a tiny distance. It is the index pulse from the DMM drive. Most likely if that signal is noisy, the a and b signals will be too. So just to clarify, its earthling the 0v out...
by ashesman
Wed Sep 07, 2022 3:31 pm
Forum: Centroid Oak, Allin1DC, MPU11 and Legacy products
Topic: Quadrature Error
Replies: 10
Views: 395

Re: Quadrature Error

>Have you done the tests for encoder feedback working? Just tried that and I can’t even turn the ballscrew without it giving the quadrature error. If I take the OAK PS earth off then I can test and the position is spot on. I think the answer lies here. If with the motor drives disabled you have enco...
by ashesman
Tue Sep 06, 2022 7:49 am
Forum: Centroid Oak, Allin1DC, MPU11 and Legacy products
Topic: Quadrature Error
Replies: 10
Views: 395

Re: Quadrature Error

So, an important thing to understand is that earth from the mains is primarily for electrical safety and noise noise. It can help as a return path for noise introduced by the mains supply itself. You have done the right thing star pointing the earths. But, remember eliminating noise is about reducin...
by ashesman
Mon Sep 05, 2022 4:05 am
Forum: Centroid Oak, Allin1DC, MPU11 and Legacy products
Topic: CONFIRM ENCODER COMMUNICATION
Replies: 16
Views: 745

Re: CONFIRM ENCODER COMMUNICATION

No need to start a new thread, unless there is an unrelated issue to discuss. I would definitely like to see your wiring arrangement. The signals to/from the Oak are differential, so very hard to introduce noise into, however, not impossible if you have very bad common mode noise due to high current...
by ashesman
Fri Sep 02, 2022 5:03 pm
Forum: Centroid Oak, Allin1DC, MPU11 and Legacy products
Topic: CONFIRM ENCODER COMMUNICATION
Replies: 16
Views: 745

Re: CONFIRM ENCODER COMMUNICATION

Could you post a video of the noise. I spent a year and a half and several hundred emails working with DMM to try resolve almost every possible issue under the sun. If you are not using their motors then good luck getting them to work. If you are running them in precision mode (A/B) mode then take c...
by ashesman
Tue Aug 30, 2022 4:40 am
Forum: Centroid Oak, Allin1DC, MPU11 and Legacy products
Topic: Strange noise on acceleration curve during motor tuning
Replies: 4
Views: 189

Re: Strange noise on acceleration curve during motor tuning

Also, starting with slower acceleration times (like 0.5s) would make tuning easier. Then works towards faster acceleration.
by ashesman
Tue Aug 30, 2022 4:39 am
Forum: Centroid Oak, Allin1DC, MPU11 and Legacy products
Topic: Strange noise on acceleration curve during motor tuning
Replies: 4
Views: 189

Re: Strange noise on acceleration curve during motor tuning

Usually high frequency control oscillation is caused by too much proportional gain or not enough derivative gain. Usually a good PID tuning method is to start will really low Kp and 0 Kd and 0 Ki, low enough Kp that response is sluggish. Then start increasing Kp bit ny bit until you start seeing sig...
by ashesman
Mon Aug 29, 2022 3:48 am
Forum: Centroid Oak, Allin1DC, MPU11 and Legacy products
Topic: CONFIRM ENCODER COMMUNICATION
Replies: 16
Views: 745

Re: CONFIRM ENCODER COMMUNICATION

Just for future reference, here is why the DMM LINE_NUM is 4095: The manual says: "Pulse output per revolution = LINE_NUM * 4" But actually for higher output frequencies, the equation is: unnamed (1).png So 4095, gives Encoder Line Number = 8192 A (or B) pulses per revolution, which is 327...