RikardLandi

Update: Took the bike to a Bosch Dealer today, he could not connect to the bike via diagnostics and Said that this could be an expensive problem. He sold me a new Purion Display which I should test with and I went Home with the bike again… Back home, I connected the new display, but issue remained. Then I started to dissasemble and measure the battery harness and found out that one of the CAN cables did not have any connection at the battery contact….took apart the connector and resoldered the cable - ISSUE SOLVED

Hello, I have a problem with my EMTB equipped with the Bosch Performance Line CX + Purion Display. Starting up the system, everything looks good - display showing battery voltage correctly, but then after two seconds display shows a symbol with empty battery bars and then shuts off. It restarts again with the same procedure. No other error codes shown. Startup OK Shows empty battery and shuts off. Bike is from 2019 and warranty has just expired! :-( I will first exchange the CR2016 batteries in the Purion Display, then I will remove the motor cover to check the cable connections - except from that I do not know what to check. Anyone who has knowledge of this Bosch System? An Electrical Schematics would have been great to have. Regards Rikard

I just wanted to give a feedback, that my new controller (ordered from China) together with a new Display was received and installed. The motor is now running smoothly both with GAS (Throttle) and PAS (Pedal Assist) :-) I think even the performance is now better than before because I can now also disable the speed limit, I can make the motor go reverse and some other nice features. My next project will be to install some nice headlights / rearligths and horn on the bike which you can switch on and off from the handlebar. Thanks for the help on this issue. Regards Rikard

Hi Aussi, Thanks. No problem, my controller has not yet arrived and due to the corona-situation I do not know how long time the shipment may take. One question: Do you have a motor with hallsensors (sensored) or without hallsensors (sensorless)? Regards Rikard

Yes, I already have a PAS on the bottom bracket. Brake switches I do unfortunately not have, my bike is a three-wheeler (cargobike) with hydraulic disc brakes on both front wheels. Maybe I will install a simple button switch on the handlebar as a brake switch for cutting the motor. However, reading the description on the controller it says : So sounds abit that the e-brakes are working similar to a throttle, but for braking instead of accelerating I will check it when the controller arrives, maybe I will buy another throttle to install on the handlebar used for braking.

Hi Aussie, Did you ever make the spread sheet? Could you please share it? Best Regards

Hi Jokskot, I hope you can access the link below: https://www.aliexpress.com/item/33048536271.html?spm=a2g0s.8937460.0.0.4e622e0eaqvOD0

Hi, I just ordered a new controller + LCD with throttle from China, I am very curious how it will work. From the spec. it sounds good, it has separate output for light/horn accessories, you can disable the speed limit, you can make the engine go reverse, you have a "cruise"-option, you can activate the engine from stand still etc. There seems to be so many questions out there on how to make your bike go faster and to disable the speed limit, the easiest thing must be to order a Controller where you can disable the speed limit or? I attach a picture of the schematics of the controller I ordered + some information about the settings. Since it is from China, the language and quality of the description is not the best, but anyhow I think it is somehow understandable. LCD_Instructions.pdf

I believe measuring resistance is the same in an AC-circuit as in an DC-circuit...but anyway I will double check on my volt-meter. I would assume that maybe the result is also different if you have the motor phases connected to the motor. I can try that again. But as you say, since the green line differs so much from the other two, I also think there is a MOSFET problem in the controller. I will buy a new one and afterwards post the result here. Thanks again

Hi Nealh, I turned off battery power, unplugged the three phase wires to the motor and measured the phase wires by the Controller. V- to: Yellow: 116 KOhm Blue: 116 KOhm Green: Infinite V+ to: Yellow : 411 Ohm Blue: 411 Ohm Green 0,5 Ohm Strange or? I know it is not correct, but I also took a small external pwr supply and applied directly voltage on the three phase lines to the motor (without controller attached). The motor turns as it should so I believe the motor windings are ok.

Update: I temporarily bridged the speed sensor input (originally coming from Hub motor) with the PAS output and yes, now the speedo shows speed. Unfortunatly the motor does still not turn. :-(

Hi, I am new in this forum, but it really seem to be a great place to find information! I´ve bought a used box-bike from a Swedish Company called Cargobike. I seller told me the battery was broken but otherwise everything should work. I bought a new battery to the bike, but unfortunately the motor does not run. :-( It has a DAPU controller, Display and DAPU rear hub motor (M123 RS) together with a PAS-sensor. The display is working correctly, but is constantly showing 0,0 km/h independent of my speed. I checked the PAS sensor because the magnet disc was a bit loose, but it seems to work OK. (+5V, GND supplied from Controller and signal from PAS is pulsing when pedaling , measured with volt-meter) I checked the motor windings, which also seems to be OK, see below. I disconnected the three feed cables from controller to the Hub motor. - Turning wheel backward- Easy Connected two of the motor-cables together - Turning wheel backward - More Hard Connected all three motor cables together - Turning wheel backward - Harder The motor is sensor less, means it has no Hall-sensors. It only have 3 feed lines + additional 3 small cables to the motor. The additional 3 small cables to the motor seems to be +5V, GND and signal which I believe is a speed signal. Measuring this speed signal (with volt meter), I could not see that it was toggeling. (constant 5V between GND to Speed signal) I therefore believe that the problem is with the speed sensor inside the Hub Motor. If the speed sensor does not provide any value, maybe the controller will not fire up the MOSFET¨s to the motor? I now wonder how i could resolve this issue. To disassemble the Hub motor seems difficult.... My current idea is to install a throttle to the controller. (It seems to have an option to do this) Maybe with the throttle attached, the controller will not care about if there is any speed signal from the Hub motor and will fire anyway. What do you think? Regards Rikard