Dynomotion

Group: DynoMotion Message: 14537 From: cnc_machines Date: 3/27/2017
Subject: Signal Loss

Greetings,


I am using KMotionCNC to run a CNC router. Instead of a standard spindle with VFD I am using a BDC motor. When I turn the motor on I lose connection between the PC and KFlop. I just click "OK" on the error box and everything works fine. I am guessing the issue has something to do with electrical noise from the BDC motor driver. 


The only cables that are shielded in the energy chain are for the encoders. All of the steppers and the spindle motor are not shielded. I am using a separate 5V power supply to drive the KFlop and for the motor driver. Can anyone think of anything I can do? Maybe put a choke on the USB cable? Is it normal to shield BDC motor cables? RPM is 32,000 maybe I am making a huge amount of noise when it is getting up to speed?


Thanks,


Scott
Group: DynoMotion Message: 14538 From: Russ Larson Date: 3/27/2017
Subject: Re: Signal Loss

Scott,

You really need to shield the spindle motor cable for sure.  I would also use a USB isolator kit and plug that into the USB port on the PC and then the cable that goes to the KFLOP into the other side of the USB isolator kit.  You are getting EMI that is causing these issues.  You can also add a choke torrid on the USB cable they do help, but the isolate will work miracles.

 

Russ

 

 

From: DynoMotion@yahoogroups.com [mailto:DynoMotion@yahoogroups.com]
Sent: Monday, March 27, 2017 5:05 PM
To: DynoMotion@yahoogroups.com
Subject: [DynoMotion] Signal Loss

 

 

Greetings,

 

I am using KMotionCNC to run a CNC router. Instead of a standard spindle with VFD I am using a BDC motor. When I turn the motor on I lose connection between the PC and KFlop. I just click "OK" on the error box and everything works fine. I am guessing the issue has something to do with electrical noise from the BDC motor driver. 

 

The only cables that are shielded in the energy chain are for the encoders. All of the steppers and the spindle motor are not shielded. I am using a separate 5V power supply to drive the KFlop and for the motor driver. Can anyone think of anything I can do? Maybe put a choke on the USB cable? Is it normal to shield BDC motor cables? RPM is 32,000 maybe I am making a huge amount of noise when it is getting up to speed?

 

Thanks,

 

Scott



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Group: DynoMotion Message: 14541 From: cnc_machines Date: 3/27/2017
Subject: Re: Signal Loss
Thanks Russ, never heard of the USB isolators before. I have been reading reviews on Amazon for some, there are comments saying it prevents the computer from auto detecting hardware. Have you ever had that issue?

I am always confused by shielding. I would pull the shield back to the power supply negative that is running the brushless motor NOT earth ground on the control cabinet?
Group: DynoMotion Message: 14544 From: Greg Carter Date: 3/27/2017
Subject: Re: Signal Loss
I use this one with kflop and used on both Win 10 (limited testing) and Win 8.1 without any problems. 

http://www.ebay.ca/itm/USB-Isolator-ADUM4160-Built-in-Isolated-350MA-2watt-power-supply-By-EtimesParts-/262686158184?hash=item3d2950ad68:g:ebQAAOSwYGFUy7FU

Greg
On 3/27/2017 6:01 PM, cnc_machines@... [DynoMotion] wrote:
 

Thanks Russ, never heard of the USB isolators before. I have been reading reviews on Amazon for some, there are comments saying it prevents the computer from auto detecting hardware. Have you ever had that issue?



.
Group: DynoMotion Message: 14545 From: Russ Larson Date: 3/28/2017
Subject: Re: Signal Loss

Scott,

I ended up getting the exact same one as Greg provided the ebay ad.  Windows had not issue discovering the KFLOP when using the USB Isolator.  On the shields for the spindle the shield should be attached to GROUND, not the negative side of the power supply.  The spindle should have an actual ground wire that is coming from the spindle supply that physically attaches to the spindle body if the connector on the spindle does not have a terminal for ground.  The shield for a spindle is attached to GROUND at the power supply side and attached to the spindle body at the spindle.  You are really trying to shield any noise coming from  that power lead.  On a DC spindle like you have the noise is probably nothing close to what you get from a AC spindle with a VFD but there is still EMI noise.

 

Russ

 

 

From: DynoMotion@yahoogroups.com [mailto:DynoMotion@yahoogroups.com]
Sent: Monday, March 27, 2017 7:56 PM
To: DynoMotion@yahoogroups.com
Subject: Re: [DynoMotion] Signal Loss

 

 

I use this one with kflop and used on both Win 10 (limited testing) and Win 8.1 without any problems. 

http://www.ebay.ca/itm/USB-Isolator-ADUM4160-Built-in-Isolated-350MA-2watt-power-supply-By-EtimesParts-/262686158184?hash=item3d2950ad68:g:ebQAAOSwYGFUy7FU

Greg
On 3/27/2017 6:01 PM, cnc_machines@... [DynoMotion] wrote:

 

Thanks Russ, never heard of the USB isolators before. I have been reading reviews on Amazon for some, there are comments saying it prevents the computer from auto detecting hardware. Have you ever had that issue?

 

 

.


 



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Group: DynoMotion Message: 14556 From: cnc_machines Date: 4/3/2017
Subject: Re: Signal Loss
Awesome, Thanks!