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How to prevent ground loop?

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mansi712
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How to prevent ground loop?

I have 2 vescs connected with can bus and single power supply. Both the vescs have same firmware and i am using similar bldc motor. I tried controlling the two vescs using the vesc tool via usb, but it didnt work and i can only run one motor at a time. So after a lot of search i found that i can may be use arduino via UART port to run both the vescs. 

I tried running both the vescs individually using arduino and it works fine, but my doubt is when i connect it to the master vesc, do i have to connect only the communication wires or GND as well? 

When i tried with the single vesc i only connected Tx and RX and it worked fine, but for connecting with dual vescs I am not sure about the ground connection as i have been reading alot about ground loops and i am really have no clue what it is and how to prevent it. 

Also i am powering up the arduino using laptop via usb. 

Does anyone has any suggestion on this?

electricfox
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It´s absolutely no problem to control two Vescs via CAN. On Trampaboards Website you find manuals for VESC´s in "HQ". In manuals it´s described how to wire CAN Bus. You should only connect CAN H to CAN H and CAN L to CAN L. Avoid ground loops. Using VESC´s with a power supply while using a laptop via USB can also cause problems. 

Onarb Kabr
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V E S C T O O L  P R O J E C T   F O R   

   E V E R Y O N E®

 

   (known as Pandora's box...)

 

 

Dear Mr. Vedder...(or somebody else)

 

I am "happy" owner of 100A vesc controller,  one kilogram weight ,3.5kW outrunner and 66 pcs. of Li-Ion cells.  I highly praise and admire Your masterwork called: VESC TOOL PROJECT...but...possession is not enough to be a Lucky guy. Goddess of Fortune won't smile on you .....until you get educated. And this is a core of my problem. I am standard electrician - electrician bu trade -maintenance guy .. with some Electronic experiences.. but... FOR PROPERLY SET/ADJUSTED VESC-(tool) it's NOT ENOUGH... THIS IS A TASK FOR NARROWLY SPECIALISED - UNIVERSITY EDUCATED EXPERT(S)-! engineers... How Can a guy/girl with medium education fully enjoy their devices which costs several hundreds $or€or£...?  Problems which are fixed on vesc forum are not for ordinary folk... plenty of requirements...real QUANTUM of values...Questions seems endless.... So ... what is a solution - (for everyone) ? ...

 

My proposal is: 

 

pleas ...

 

# Create (some possible) database (list) of verified-recomended-well estabilished settings of "vesc+mot"-pairs, which's "behavior" -based on (some) requirements will be (briefly) described in attached description. (batt.type too) if it's possible, "pack of settings" could be easy sent by email . Contrive and trump up the way how to transfer "pack of settings" get into vesctool and drop it in vesc.

 

# Make (affordable payed) service which will Create "custom settings" based on individual "unit behavior" requirements. (May offer limited list of settings of pairs - which's behavior  and properties are REALLY and SERIOUSLY tried and approved)

 

# Make an "homepage post" - place, where satisfied users will publish (in prescribed way) their own settings-experiencies with their pairs (vesc+mot) with behavior-properties of used drive units...(boards, scooters, bikes,vehicles...) (those people could be called DIAMOND CONTRIBUTORS ) 

 

 

or

 

# Send me some website where I Can buy some cyanide or any venom....

 

 

truly Yours... 

 

 

Hopeless Holder™ 

 

 

 

 

... Sent From my sister's Huawei