Whats the max amp battery output the FOCer 2 is sustainable at? 12s2p p42a 45amp output battery ok with it?
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You could get away with 45A continuous with really good thermal management. Like forced airflow or just relative airflow on your ride.
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At what point does it start throwing faults?
Wonder how it will hold up mounted to a heatsink inside a metal diy onewheel frame…no air but lots of metal
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Would probably want to wait for the high volt versions for a OW, the top speed with 12S isn’t very good.
I bet that a large heatsink would do pretty darn good with either.
No space for a high voltage battery…otherwise would’ve gone with a stormcore…plus the $$$
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are you going for like a Pint size?
I’m guessing you will do the retermination of the Phub for higher KV?
It’s the diyonewheel frame so i believe its pint sized, nah, I have my esk8 for speed, this will just be for offroading.
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Just a quick question. If two FOCs (VESCs) are connected via CAN bus and one is set to master, which parameters are actually ignored from slave and used from master board? I mean in my case, I am thinking this: if I have two wheels for two VESCs, they will be connected via CAN and controlled with one ADC throttle. But, what about motor currents, regeneration currents, battery max currents etc.? Are they shared or used from master only? i.e. Do I have to divide by two regeneration current value of one motor or set total values on master board only?
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The CAN communication is for control only. You will have to set the parameters up on both. So if we take current for example, if you have a battery max of 60A, then you set it to 30A battery max on both VESCs.
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Thanks!
Hi! I am about to order PCBs and a components to build my FOCer, but I found a video on youtube of a small problem.
At 10:45 he starts to talk about a diode on the 5V rail getting hot. He ordered it with the DRV soldered on from pcbway, not jlcpcb. Do you think he has the same problem, aka a bad DRV that doesn’t regulate the 5V rail properly? Or is it another problem?
If I order the DRV from lets say Mouser, and its a good DRV chip, not a faulty one, will this happen to me as well?
Sorry this might be a stupid question to ask, I just want to be sure its not the design’s flaw.
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His issue with the 5V rail on the PCBWAY boards turned out to be the wrong diode being used in the buck converter. It’s the one right by the inductor. The DRVs from PCBWAY were fine.
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If you thermally couple the CFOC2 to the frame, then frame has relative airflow and you’re good. This is same as attaching a massive heat sink and running a fan over it. I recommend it
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@shaman what is the intended function of the 5v pins on the bottom right of the board? powering an additional mcu?
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It’s for low-power 5V accessories. Like a Bluetooth module or whatever
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Yes that is what I did on my funwheel and it works great. Mounted to 1/4 aluminum on the bottom of my frame through a thermal pad. No worries about heat at all.
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I used the extra 5V pins to power the LED ring around the button on my funwheel so it lights up when the board is powered.
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I can report that 3 out of 5 focers show the power regulation issue. All five of them are from the dreaded lot 88ASYCTG4. When ramping up the voltage on them the 5 volt rail stops at 5,2V for the good ones and exceeds 5,2V on the bad ones. I hope i did not break the other parts on the 5V rail by going up to 5,5V. Will replace the bad DRVs, waiting on new ones from china. By the way @shaman excellent work with the FOCers the good ones perform like a charm.
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