Bnineteenteam 36V/48V 250W Electric Bicycle Wheel Kit

[Mappier]

Hi all,
The lockdown got me out on my 17 years old Specialized Expedition bike which I hadn't ridden for some years and it highlighted the shortcomings of my 74 years old knees. fancying a project I ordered a Bnineteenteam 36V/48V 250W front wheel kit from Amazon. It arrived last Thursday.
I'm new to ebikes but the kit fitted to the bike without too much trouble even without any instructions. I hooked up a new 36V battery and the display lit up, good. Alas when I spun the crank hoping for the motor to come to life, nothing. I tried the thumb throttle, still nothing. I disconnected the brakes in case the switches were sticking, still nothing.
I'm fairly mechanically minded but have no electrical background, where do I go from here? Is there a simple troubleshooting guide I could follow without specialist electrical test equipment?
Thank you in advance.
Jim

 

[vfr400]

Can we see a few photos of what you have so that we can give appropriate advice. In the meantime, make sure that the motor connector is all the way to the marked line, not just in tight.

 

[Mappier]

Thanks. Although there wasn't a connection diagram of the leads from the controller every connector is different so impossible to make a mistake. Having said that some wire colours didn't match up. The only mod I carried out was to cut off the bullet connectors on the red and black wires to the battery. The battery came with a C13 plug and I spliced extensions to the controller's red and black wires.
The hub motor is labelled 48v 250w, would it improve performance in the future to use a 48v battery?
Hope this helps.
Jim

 

[Nealh]

The controller a KT is dual voltage so yes in the future one can simply use a 48v battery.
Does the throttle not work ?
Does the throttle & PAS use the same SM3 pin Male or female pin connector from the controller or are they opposing male and female connector ?

 

[vfr400]

If the wires didn't match, that could be the problem. Can you show us.

BTW, your motor is in upside down. The cable should go downwards unless you want to use your motor as a fish tank, while you're riding. Also, your 48v motor might be a bit slow at 36v unless it's a high speed one.

Keep the throttle away from the bend on the handlebar or else it'll jam. You should be able to get the brake right against the shifter, then slide the throttle until it's against the brake. Did you use the little ring with three tags in it, which is a spacer to stop it jamming on the brake?Most people don't realise what it's for, so they leave it off.

 

[Mappier]

Thanks Nealh and vfr400, I'll make those adjustments.
The lead from the throttle has pins and from the PAS sockets. The PAS lead is on the left with the heatshrink.
Do you suggest I return the 36v battery and buy a 48v one?

 

[vfr400]

Pull back the heatshrink and check that the wires are connected in the right sequence.

Disconnect everything from the controller except the battery and LCD. Switch on the LCD and check that you have 5v between the red and black on the throttle, then connect the motor, PAS and throttle and recheck the 5v after each one.

 

[Mappier]

I peeled back the heatshrink and the wires are connected in the same sequence. Did a voltage check on the throttle and PAS and they are 4.52v. Connected the motor cable and rechecked voltages which were still 4.52v. I turned the crank forwards and backwards, no motor movement.

 

[Nealh]

Double check the hub motor connector is fully pushed home.
Have you checked battery voltage with the meter ?

The PAS sensor needs to be about 1mm from the magnets on the disc and the sensor might have a Red led that blinks when it senses a magnet/pulse , the throttle may simply not work because it may be pre - programmed as pedal first for it to operate. The walk assist should work with out PAS operation.

 

[Mappier]

DaDa success! I pushed the motor connectors together really hard and felt a little extra engagement which did the trick. I'll do the mods suggested and try it on the road to see how the 36V battery performs; I may send it back in exchange for a 48v one.
Thanks for your assistance.
Jim

 

[Nealh]

Often it is the fix quite a few fail to realise often disbelieving what they are told, if one looks carefully at the connectors not only is there an embossed arrow for alignment there is also an embossed stop line on the motor end of the connector. It only needs 1 -2 mm for engagement to be ineffective.

 

[Mappier]

Five years trouble free biking, hence my silence on the forum but now with the law change my thumb throttle is deemed illegal. I find the thumb throttle so convenient, hill starts etc but as I don't want my bike crushed I'm looking for suggestions on how to stay on the right side of the law. Thanks in advance.
Jim

 

[Nealh]

For a legal throttle there are three routes:
1. SVA which means a few bike mods.
A. Bike stand .
B. Ball end brake levers .
C. Mirror.
D. Wired lights front and rear.
E. EN15194 compliance.

2. A EAPC /kit older then 2016.

3. A KT controller kit on any age of bike.
With a KT one can have full speed control via a device under pedal activation.
Cease pedaling and the speed device is in active , bar 6km/h walk assist mode (which is legal).

Common speed device is via twist grip type, thumb lever type or a momentary type button set up.

 

[Tony1951]

I had a thumb throttle on my Bafang mid drive/ specialised conversion. I messed around with the controller settings trying to limit its non pedalling speed to the low speed allowed, but it was pretty useless like that, and had barely any power, so I just removed it and put the throttle in a junk box.

Yes - there are certainly times when it would be useful to have a throttle so I could set off with full power - like for example, starting on a hill, but I soon got used to not having it. I made some changes to riding technique, for example, when approaching an uphill junction, make sure to drop a couple of gears so I can actually make a swift pedal to get going. Once that BBS01 kicks in it pulls off on any slope.

 

[saneagle]

Five years trouble free biking, hence my silence on the forum but now with the law change my thumb throttle is deemed illegal. I find the thumb throttle so convenient, hill starts etc but as I don't want my bike crushed I'm looking for suggestions on how to stay on the right side of the law. Thanks in advance.
Jim

All is not lost because you have a KT controller. Easiest solution would be to buy any KT LCD with the correct connector and length of cable, like LCD5, LCD4 or LCD 3. That will give you easy access to the settings. You set P4=1 and C4=3 to make your bike legal and get 4mph hill-start assist.

I think there is a way to adjust those parameters with what you have by doing some complicated button pressing procedure. Download the manual from the KT website. It's the LED900S.

KT-LED900S Display User Manual_V1.0--Suzhou Kunteng Electronics Co.,Ltd--Suzhou Kunteng Electronics Co.,Ltd

Suzhou Kunteng Electronics Co.,Ltd

www.szktdz.com

 

[saneagle]

I just looked at the manual, and it doesn't show the advanced settings. Instead, look at the one for the LED890 Parameters Setting Manual. See if that works. You need to set P4=1 to make the throttle dependent on pedalling, which will make your bike legal while you figure out what to do.

 

[saneagle]

This manual tells you how to do the basic settings, like maximum speed, for the 890. Please let us know if it works for yours. I think it will.
https://www.fietsoptimaal.nl/img/up/LED-890-EN display handleiding.pdf

 

[Mappier]

Thanks for all those suggestions. You'll note from post back in 2020 that my controller is rated at just 7A, if I procure a more programmable display would there any benefit in getting a matching controller with a higher output for those times when my throttle is currently good for?

 

[saneagle]

Thanks for all those suggestions. You'll note from post back in 2020 that my controller is rated at just 7A, if I procure a more programmable display would there any benefit in getting a matching controller with a higher output for those times when my throttle is currently good for?

It gives 15A max and it doesn't know its rating. The rating is always half the max current. If you ride continuously at maximum power (current), which can only happen at low speed due to the back emf, the controller will eventually overheat, but in normal use, that rarely happens unless you have a motor that's too fast for the speeds you ride.

 

[Mappier]

All is not lost because you have a KT controller. Easiest solution would be to buy any KT LCD with the correct connector and length of cable, like LCD5, LCD4 or LCD 3. That will give you easy access to the settings. You set P4=1 and C4=3 to make your bike legal and get 4mph hill-start assist.

I think there is a way to adjust those parameters with what you have by doing some complicated button pressing procedure. Download the manual from the KT website. It's the LED900S.

KT-LED900S Display User Manual_V1.0--Suzhou Kunteng Electronics Co.,Ltd--Suzhou Kunteng Electronics Co.,Ltd

Suzhou Kunteng Electronics Co.,Ltd

www.szktdz.com

Thanks for those pointers - I tried what is called the 6km/h Boost with my current 900S setup and the bike hardly moved with me sat on the saddle; it is meant a an assist when walking the bike.
I looked at the KT LCD3 display manual and I think I would be able to set up the throttle to allow legal operation.