remove speed from samebike 20lvdx30

vfr400

Esteemed Pedelecer
Jun 12, 2011
2,803
814
Basildon
Something is pulling the voltage down. it can be anything on the 5v rail, which includes the controller cpu, throttle, PAS, motor hall sensor, motor cable and any other cables. That only leaves the battery. If you unplug everything from the controller except the battery, and the 5v is still down, it has to be something in the controller. If you look at the PCB, you'll find that all the 5v wires go to the same area. have a look around there to see if anything is amiss.
 

picusiaubas

Pedelecer
Jan 28, 2019
27
1
Something is pulling the voltage down. it can be anything on the 5v rail, which includes the controller cpu, throttle, PAS, motor hall sensor, motor cable and any other cables. That only leaves the battery. If you unplug everything from the controller except the battery, and the 5v is still down, it has to be something in the controller. If you look at the PCB, you'll find that all the 5v wires go to the same area. have a look around there to see if anything is amiss.
I removed the silicone and checked each cable that goes out of controller. They seem perfectly fine. I couldn’t find any melted coating or anything. And the PCB itself looks like new. Maybe I’m missing something, but I am really tired of trying to get this piece of crap working.
New controller seems so much easier option. Tried asking this chinese bike producer for a new controller, but they don’t seem to care much about responding to their customers.
So the only option is some random controller with a throttle. As I understand, one with 3-pin motor connection, 5-pin HAL sensor connection and 48V/350W should work? Regarding the battery connector probably the best option would be to reuse the old one and solder the wires? I don’t care much about other components like lamps, brakes, etc.
2ED7B0B9-12EB-4CE4-AFA0-9373806518D0.jpeg
 

vfr400

Esteemed Pedelecer
Jun 12, 2011
2,803
814
Basildon
No need for a battery connector. Cut them off and solder the wires, which is quicker, cheaper and more reliable.
 

Erisaman

Finding my (electric) wheels
Jun 12, 2019
6
1
picusiaubas - I assume you will have seen the YouTube video
dealing with a replacement/upgraded controller for the XMZ121? There is also an interesting posting by 'Craigs' in the Electric Bikes General discussion wanting to have the speed limiter returned to his [equivalent] XMZ1214.

I was interested in removing the limiter on my newly purchased 20LVXD30 - but having ridden it very few times I find that my balance is not what it should be (now aged 73) and I'll be advertising it for sale. Pristine condition of course, never dropped nor scratched - Classifieds - here I come.

Good luck with your venture.
 

picusiaubas

Pedelecer
Jan 28, 2019
27
1
picusiaubas - I assume you will have seen the YouTube video dealing with a replacement/upgraded controller for the XMZ121? There is also an interesting posting by 'Craigs' in the Electric Bikes General discussion wanting to have the speed limiter returned to his [equivalent] XMZ1214.

I was interested in removing the limiter on my newly purchased 20LVXD30 - but having ridden it very few times I find that my balance is not what it should be (now aged 73) and I'll be advertising it for sale. Pristine condition of course, never dropped nor scratched - Classifieds - here I come.

Good luck with your venture.
Thanks! Haven't seen this video. That LCD screen is huge! I will maybe go with something smaller, for example: https://www.banggood.com/24V36V48V60V-250W350W-LCD-Brushless-Motor-Controller-Battery-Speed-For-MTB-E-Bike-Scooter-p-1399444.html?rmmds=search&ID=520454517271&cur_warehouse=CN

Interestingly, it doesn't include any throttle. I wonder if I can use the one that I have right now. Connector seems to match.
 

Nealh

Esteemed Pedelecer
Aug 7, 2014
8,149
3,085
56
West Sx RH
Throttle should work if you get the wiring order correct.
 

onaj

Just Joined
May 21, 2019
2
0
On this Link you will see the Display an Setting-Menü - https://www.aliexpress.com/item/twist-throttle-rolling-handlebar-for-electric-bike-scooter-tricycle-MTB-36v48v60v-with-lock-key-cruise-speed/32877747357.html?spm=a2g0y.10010108.1000001.8.446c4ac1yY6SpJ&isOrigTitle=true

I have raised the "battery voltage ration" in P07 from 95% to 105% but nothing happens. The wheel turns in freewheeling exactly 29.9 km/h. Somebondy here have written of 37 km/h - that would be fantastic. :)
Hi,
I play with menu but I didn't write default values. Would be possible write me original value. P01 to P08 ?
Thank you very much ;)
Jano
 

onaj

Just Joined
May 21, 2019
2
0
Hi,
I play with menu but I didn't write default values. Would be possible write me original value. P01 to P08 ?
Thank you very much ;)
Jano
Hi
for everyone i contact GB support and default values are P01-48 P02-1.0 P03-1.0 P04-2 P05-20 P06-43 P07-1
Onaj
 

picusiaubas

Pedelecer
Jan 28, 2019
27
1
So, I’ve got the new controller. And it seems to be alive! At least on PAS.

Not so straight forward with the throttle connector. This is the setup:

31371

The brown and yellow wires are the switch on the throttle, the green one on the same connector is battery voltage for the LED indicator lights. Red and black joined to orange aand black are the 5v wires. that leaves the blue to green is the throttle signal wire (1v to 4v).
If I understand this correctly, to use the throttle I need to connect red-blue-black wires from the throttle to red-white-black wires from the new controller. Is that correct? If so, I would need to change the connector since they don’t match at all..
 

vfr400

Esteemed Pedelecer
Jun 12, 2011
2,803
814
Basildon
If I understand this correctly, to use the throttle I need to connect red-blue-black wires from the throttle to red-white-black wires from the new controller. Is that correct? If so, I would need to change the connector since they don’t match at all..
To be sure, show all the connectors on the controller and what you have on the throttle. You don't need connectors. Cut them off and solder the wires together. insulate with heatshrink sleeve.
 

picusiaubas

Pedelecer
Jan 28, 2019
27
1
Nevermind, I joined the wires the way I wrote in the previous post and the throttle works fine. Also joined the wires for the brakes sensors and they also started working.
I am getting a few km/h more with this new controller then before (28-29 km/h GPS) and also some nice features like an auto-pilot. Replacing is a bit painful because most of the connectors don’t match and you need to cut the wires to join them. But is certainly worth doing even if the old one is not broken.
 
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