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Unread 02-14-2017, 09:24 AM
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Electrical Noise on CAN BUS

Hi-

For this year's wiring on our bot, we are using Talon SRXs with CAN BUS. They are all right next to each other on the robot and there is a lot of excessive wiring. As of now, it is simply bundled up and zip tied together along with the 12V power wires right next to it. Will the constant change in voltage in the power wires induce a charge in the CAN BUS wires creating interfereance and electrical noise?

Thanks
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Unread 02-14-2017, 09:30 AM
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Re: Electrical Noise on CAN BUS

Quote:
Originally Posted by 7keleher View Post
Hi-

For this year's wiring on our bot, we are using Talon SRXs with CAN BUS. They are all right next to each other on the robot and there is a lot of excessive wiring. As of now, it is simply bundled up and zip tied together along with the 12V power wires right next to it. Will the constant change in voltage in the power wires induce a charge in the CAN BUS wires creating interfereance and electrical noise?

Thanks
CANbus is differential signals.

As long as you use twisted pair for wiring, the CAN signals should not be affected by external interference and noise.
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Unread 02-14-2017, 09:36 AM
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Re: Electrical Noise on CAN BUS

The short answer is maybe. It is bad practice to put communication wiring next to power wiring. Especially something with rapidly fluctuating voltages like PWM motor controllers. (Talons are PWM output) Worst case is to loop wiring and lay it parallel to the power wires. General recommendation is to cross power wiring at 90 degrees ant to keep as much separation as possible. Of course if you follows all the rules for digital data busses, then is practically impossible to connect them to the equipment they are supposed to control.
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