" Cruising down the highway at 65mph last Friday I suddenly lost power, no bang, no burning smell. I pull over check fuse, contactor and power to Controller. All looks good. Call a tow and suspect the Altrax SPM72400. Next morning I plug in the usb, all looks good. Pull out a 12v battery, put the bike on the center stand and energize the motor....nothing. Pull off the brush cage and wow...4 out of 8 brushes totally gone on positive side! 4 on negative side have about a quarter of an inch left! I only have about 3000 on the new motor, I would have thought the brushes would last 3x that? So now the search is on for spare brushes, not easy since the Agni motor isnt carried by EV suppliers anymore. Good news is the armature looks very good. "

" Hey look, it's me! Nice article about the bikes outside of the Handbuilt show.

https://www.revzilla.com/common-trea...ref_map=%5B%5D "

" When you solder it back, make sure to glue it in place so it doesn't vibrate and fatigue the lead and break off again. "

" Can you test igbt or mosfets while they are still on the board? "

" Yes resolder that. Test it first.
Next step is checking the line side. See if you have a couple hundred volts on the buss capacitors.
Most common catastrophic failure is fets or igbt. If any are zero ohms ,in circuit, or blown open you can assume they are bad. "

" can you resolder it to the board? "

" My KP-2500 charger gave up the ghost in sparking loud crackpop sound. The only physical thing I found was the resistor in the 2nd picture was detached at the bottom.
I have 2 mean wells coming so I thought I would take this apart and see if I can troubleshoot it with some electricians help. I have no schematics of course.

Are there any tests I can do myself?
Any thoughts of primary failure component?

https://uploads.tapatalk-cdn.com/201...0ec5a333e9.jpghttps://uploads.tapatalk-cdn.com/201...023733d778.jpg

Sent from my SM-G920V using Tapatalk "

" That's bad luck. This thread, was what mad me join the forum!

Good Luck getting it sorted "

" She has a nice butt, yes

A nice shot from a photograph that was on site during the lap, Norbert Nickels

Attachment 7358 "

" sorry, duplicate "

"
I didn't realize how HUUUUUGE your rear tire is!! Cool! "

" Awesome project! "

" ok, i got the motor amps now, these were the 2 bytes. I did not modify the code yet to account for signed values, will add this later.

For those interested in writing your own apps for Android phone, check out: http://ai2.appinventor.mit.edu/

It's a free web based program to code your own apps, without actually coding, you just assemble blocks together, it's much easier than coding, ok there's surely things you cannot do this way that require real code like Android studio, but you can get your first app in no time. You just have to install the MIT app inventor companion on your phone from the Play store, then when you're finished to create your program, you click on build, it displays a 2d bar code which you scan with the app companion and the app runs right away on your phone, pretty cool. YOu can also create an apk file when you are done to actually install a standalone app on your phone or share.

I attach a zip file of my program to read the motor amp PID, just unzip and import the file into App inventor and you will see my screen and blocks, you can modify the blocks to suit your needs. I started from a program downloaded from the gallery made by a guy in Mexico i think, you can still see some spanish words in the program. You will need to have a bluetooth adapter for your OBD2 connector.

Thanks guys !

Attachment 7356 "

" You got it. B48601 returns an extended frame message where the bytes go into A-F.

Keep in mind temperatures and amps are signed, so you have to use 2's complement to get the correct positive or negative decimal value. "

" Have you looked around on the Torque Forum? I posted there a lot back in the day.... pretty helpful.

It looks like you're correct. "

" well the screen shots above are from Torque, but believe it or not i am writing my own app for Android, yes, using MIT App Inventor 2, cool program, web based.

I looked again at the data i receive, see picture below, could the data be mapped like i show ? you will tell me that E is 21 on my screen and not 20. But when i took the screen shot on my computer, the data on screen was changing rapidly, it could be that i caught it while refreshing the screen. I'm planning to try this mapping tonight and compare with Torque.

Attachment 7355 "

" What software are you using? "

" Nice thread. Skimmed it - good luck in your ventures.
I signed up just to see your pics ;-)

I started a similar effort based around the LTC6811 (drop in for 6804, found this thread searching for an Eagle Footprint). I need to brush up on my 0-60 skills (nothing to something) so I am going to forge ahead with a fresh design that has some risk boiled into it.

One of the targets is to manage 28S Zero cell boxes that lost their BMS (or came without one)
First iteration will be for a 6S electric Kayak.

-methods

P.S. If anyone wants to talk Sevcon, DLD, DCF, Zero... stuff like that... lets engage in another thread. Been doing a lot of that over at Calfee Design. "