Thread: Huanyang Mach3

One thing with the earthing is to only earth one end of the shield, otherwise you will create an aerial and it will pick up all the noise being generated.

You are correct with your analysis, the problem is going to be EMF.

thank you for reply
I have only one end of shield to earth ,did read about this somewhere.

thanks again roly

Okay then,

So on my unit I have a choke placed on the VFD's cable. The idea here is to stop any EMF getting back to the control circuitry. I suspect you have it leaking some where but without using an oscilloscope it is going to be a hit and miss effort.

Just to cover all the basis, I also have placed a choke on the power cable of the VFD to stop any emf getting to other systems via the power path. With these measures I have been able to suppress all problems on my machine

Best of luck

Hi Roly

I found that I also needed to put a small cap (0.001) across the terminals of all my BOB outputs to stop noise that was constantly triggering the E-stop. This had been driving me mad for quite a while until I did that, then sudden calm and no more spurious E-stopping.

I have a vfd shielded cable . To use a choke do I remove some shield and put a choke around all 3 wires or a choke around each wire and could u tell what sort of choke .have some power leads here that have some sort of chokes on them . This were used for old monitors etc.
Thank you roly

For got to say do you have any ideas why it's only the z axis
Roly

clutching at straws , i had random movement in z axis when 1 cable broke ,in the cable chain , run a mulitmeter across all 4 wires , and see if one has a different resistance ?

but my problem was more , random direction , than random movement , the z axis had to be moving for the randomness to happen , not stationary randomness ??? i dont think i made sense then ? stationary randomness has to be noise ,

might just be a bad connection ? that picks up spindle vibration



Edit , might as well start with the 2 coils , unplug your stepper drive > motor plug ( with no power on ) , and find your 2 coils , if they read the same in ohms , its not a problem there , could move the axis by hand to test for an intermittent fault

but i agree , it sounds like noise , we need photo's of the inside of your box, type of BOB , placement of parts ect
in the box is the z axis closest to the VDF ?

Originally Posted by rolyjm

For got to say do you have any ideas why it's only the z axis
Roly

Could be a bad connection. Try changing the wires on the driver and see if that changes the problem to a different axis.

Ok this is where it get funny
If I change z to x cables at controler now x spindle motor plays up
This is why I got new controller board the mechatronics 4axis did have 3axis mechatronics
Because I thought it was the board that was crook
This is fitted in a metal box (x eBay 6040 cnc machine) this box is about 1mtr away from vfd /spindle motor. Yes the z axis stepper motor is very close to spindle motor, ( but x spindle motor is a long way away from spindle but x plays up as in test above.)
Also could tell me what is BOB
,have also change z stepper motor (eBay) new
The switch mode power supply for driver board is about 1mtr away from spindle and vfd
Hope this info can help
Cheers roly

It sounds like interference on the inputs of that driver.
I don't know what a mechatronics driver is. Is it a single axis unit or multi do u have another boad that the pc connects to then wires to each driver. Is it the setup that comes with the ebay 6040 machines or have u changed it. If the chinese machine like mine, 4 driver boards and a seperate board to interface to the pc then it probably needs some filter caps on the inputs.
Can u post a pix of the board/boards.
Mike

Roly posted previously that his problems occurs when he starts the spindle. This is most likely an RF problem.

When you add the choke, don't remove the wires, just loop the cable through the choke, or connect the choke via its clips over the cable (This all depends on how the choke is made and how large it is)

Post some pictures of your setup, it is very difficult to work this problem with just your explination

/M

the driver is From USA (easy cnc) its the 4 axis also have there 3 axis and yes machine is a 6040 from ebay
will get some photo done and post friday . Ps if i go back to the spindle motor that came with machine all axis are ok ( this is a DC motor brush type)
I still dont know what a ( Type of BOB) means) . I also stuffed up ment to say when i swap z x axis cable over the x stepper plays up so it is all ways the z driver on all my driver boards even TB6560 when cables are changed the stepper the is conected the Z axis (as marked on board) is the one that plays up.. can I try .001 caps on the inputs or outputs of the driver board
any how will get some photos going
sorry for mixing up all the posts in one reply
roly

are u still using the little board that the 25 pin connector from the PC plugs into then has wires going to the driver boards? or has that been removed. If your still using it the input chips on it are not compatable with the low voltage type outputs from many PC's That little board is the BOB or Break Out Board I changed the chips to a different type that work with all the parralell ports on PC's. This board breaks out the connections from the 25 pin plug to many drivers. If your 4 axis board has the 25 pin plug on it then it has the BOB built into it.

BOB refers to the BreakOutBoard that is the connection between your computer and the CNC machine. It gets a signal from the computer and sends that signal to the proper driver.

You shouldn't need caps on the drivers, only on the BOB.

If you have a 4 axis board then use the fourth axis as the Z axis and see if it works properly.
You will need to tell Mach that you are using different pins. This is done in the set up pages of Mach. So, for example, if Mach is set up with the Z axis using pins 8 and 9 and the fourth axis you have uses say pins 10 and 11 (or whatever) then just swap those numbers around so that Z now uses 10 and 11 and then change the Z axis wiring over to those pins.