Yah, that´s why i´m wondering where @bimmer has had 4 wires before.
If he´s just wondering if im stupid enough to did a 4 wire connection - nah mate, can´t be so drunk to do that over 2 years of working with vescs 
So did you kill the CAN chips or the 3V3 regulator, if no leds are lighting up?
Good question, last time i had something like this, the Can chip died. Do you know how to check if its the regulator?
Both ESCs connected to the same battery I guess, one switch.
Yes for sure! (Is anyone running dual on two different batteries?)
CAN on HW 4 can handle ±12V only, while HW6 can handle ±60V. This is why HW 4 needs to be powered up at the same time. If for some reason there was a voltage difference above 12V, they would have blown because of that. And to me that sounds the most plausible explanation. The reason for the voltage difference has to be somewhere in the system or on one ESC. It is always a good idea to test things on 11.1 V (3S) if you have a 3S to hands to avoid such issues.
1 Like
(Is anyone running dual on two different batteries?)
YES we are.
can anyone confirm this?
i am currently setting up 2 esk8 VESC 1.1 and they’re HW 4.12 afaik.
@esk8 maybe you can give us some answers
i never heard of this problem but this scares me of using CAN for 2 VESC on the same battery
good to know. The thing is, the setup ran fine half a year ago, but now poof…
1 Like
I know I am repeating myself but does anybody have a link or a quick explanation on best practices when connecting VESCs 4 and CAN bus? Especially when setting up the VESCs.
Whats important? Which order?
Threads like these give me goosebumps.
I get that both vescs need to be on the same power source and connected simultaneously. Is that all? CAN bus connected from the beginning?
1 Like
yeah, i want this too. still afraid to connect the VESC together via CAN.
Yes, CAN connected, simultaneous start-up. At setup 3s is always a good idea and CAN save some $$.
1 Like
This is how you should do it. Y-PPM causes ground loops, which can kill your voltage regulators, since they will always fight against each other. CAN is the way to go and should work just fine.
wait…wait…wait.
i was not talking about Y-PPM, i was talking about CAN.
so you say, connecting two VESC via CAN is no problem, no matter how they’re connected to the battery?
- connect both VESC via CAN
- power up both VESC via Loop key or switch or […]
That is questionable because what happens with CAN if your master (ppm attached to master) is fired? you cannot drive home.
but what about split PPM? Well you can drive home…
It is like a coin: every side has pro and cons…
1 Like
When i Setup a board i ALWAYS configure each vesc individual and then attach/Setup CAN. This way i will know if one VESC is faulty before running into CAN-IS-A-BITCH-PROBLEMS (preventing fried hw)
1 Like
The thing is CAN is supposed to be 100 times more reliable than PPM since it was developed for communication between vital electronic components on vehicles. It gained a bad reputation in this forum probably because of bad installations or obsolete chips.
1 Like
This is a good advice! If you then use a 3S for configuration, nothing should happen.
This is why you only run canbus with tx and rx connected, and the ground and vcc depinned…
Can’t blow a can chip without a shared ground or vcc. I really don’t understand why every vesc has 4 pins, Should only have two to prevent user errors…
2 Likes