Hello Guest it is September 21, 2019, 08:34:20 PM

Author Topic: Motors stalling /growling  (Read 2266 times)

0 Members and 1 Guest are viewing this topic.

Re: Motors stalling /growling
« Reply #90 on: June 05, 2019, 07:03:31 AM »
I will try to take a video.

Can you tell me exactily were to test for the voltage drop??

Offline Tweakie.CNC

*
  • *
  •  7,911 7,911
  • Super Kitty
    • View Profile
    • Tweakie.CNC
Re: Motors stalling /growling
« Reply #91 on: June 05, 2019, 07:30:48 AM »
Quote
Can you tell me exactily were to test for the voltage drop??

Output of the power supply feeding the stepper motor drivers.


Tweakie.
« Last Edit: June 05, 2019, 08:13:57 AM by Tweakie.CNC »
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: Motors stalling /growling
« Reply #92 on: June 06, 2019, 07:02:11 PM »
power from power supply to driver and hope you can hear it.
Re: Motors stalling /growling
« Reply #93 on: June 07, 2019, 04:33:05 PM »
Hi,
there is a small variation there but I would have thought well within bounds.

One possibility is that if when an axis, X say, is accelerating it will draw significant current from the supply and that will
cause a variation in the supply voltage. The variation could be construed by the Y axis driver as an input pulse and it would
therefore react. You could say that it is an example of 'conducted noise'.

Some people try to use the one high voltage supply to provide the stepper drivers but also feed a voltage reducer to provide
low voltage for your controller and BoB. It is not recommended as any variation in supply voltage is likely to be impressed on the
low voltage thereby introducing noise into your controller/BoB.

Do you have a separate low voltage supply for your controller/BoB combination?

Craig
My wife left with my best friend...
     and I miss him!
Re: Motors stalling /growling
« Reply #94 on: June 07, 2019, 05:38:56 PM »
Yes I do have a separate power supply for the BOB.
Re: Motors stalling /growling
« Reply #95 on: June 07, 2019, 05:46:43 PM »
 I do have power supply for each driver, and ESS and BOB.
Re: Motors stalling /growling
« Reply #96 on: June 07, 2019, 07:07:07 PM »
is there a possible fix for this problem?
Re: Motors stalling /growling
« Reply #97 on: June 07, 2019, 08:48:09 PM »
Hi,
it is far from certain what the problem is, there may in fact be two or three problems which are compounding things and
making it hard to diagnose.

You have bought yourself an ESS which is a good step to ensure good pulse streams to your BoB and stepper drivers,
yet the problem persists. It is not impossible that there is a problem with Mach/ESS/BoB but being able to eliminate
Mach/ESS/BoB altogether is the only real way to test the capability of the stepper/driver combination.

I suspect, but cannot be sure or prove, that the issue is with the steppers and drivers.

Electronics is my thing and I have a digital signal generator. Were this my installation I would drive the step input
of a driver direct from my signal generator. I could then be ABSOLUTELY certain that Mach/ESS/BoB have no part in the
test.

One of the challenges of testing steppers and their drivers is that it is not possible to just turn on the signal generator
and expect the stepper to be able to accelerate instantly. It is necessary to start the generator at a low frequency,
maybe a few Hz, and then increase the frequency taking note the frequency at which  the steppers start to lose steps
or stall. The frequency at which the steppers stall is the uppermost limit that your steppers will perform. In a CNC machine
there will be loads induced by cutting forces and the torque necessary to accelerate the mass of the axes. Thus the ultimate
top speed that you have determined may be much less in practice.

Do you have access to a signal generator that could perform such a test?

The number of posts and the duration of this thread suggest to me that you must be getting very frustrated with the whole
thing. It might be time to enlist, even pay for, the help of a electronic technician. A stepper/driver test like this should not
require much more than half an hour for a technician. You really need to nail down where the fault is: either the stepper/driver
OR Mach/ESS/BoB.

Craig
My wife left with my best friend...
     and I miss him!

Offline TPS

*
  •  1,389 1,389
    • View Profile
Re: Motors stalling /growling
« Reply #98 on: June 08, 2019, 03:23:49 AM »
hi,
one idea is left. can you pls do a

G1 X0.1968 F1

in MDI, and confirm that the Motor does exactly one Revolution?
anything is possible, just try it.
if you find some mistakes, in my bad bavarian english,they are yours.
Re: Motors stalling /growling
« Reply #99 on: June 08, 2019, 11:30:40 AM »
I will have research for a signal generator and a electronic tech.


When entering the G1 xo.1968 f1, it keeps turning never stops and is very slow and rough sounding.