Hi All,
I am working on an electronic engine controller with CANbus at
250kpbs. It is used on a large 200KW generator set, 480V-3phase.
Getting some strange CANbus missing data but very intermittent and
only seems to happen in the testing lab and not in other situations.
The only difference I can think of is that in the lab the main power
wires are connected to a load bank to run under load testing. I also
noticed that the CANbus wire is shield twisted-pair but it running
directly on top of the AC alternator and current transformer so its
practically living next to the main power outputs of the generator
set.
I'm wonder if its conceivable that 60hz electric or magnetic field
interference could effect the CANbus at all?
Thanks,
Paul
Paul,
we use CAN over long distances and only had problems with the Ground
signal where the ground is different on two nodes. CAN-H and CAN-L are
tolerated only until a certain level (24V ?).
One other problem we had was our power supply (switched regulated wall
power supply - ), Now we have one with a 3 pin connector to the power
(L-N-Earth).
Have you considered using some ferrites?
HTH,
Adib.
