More control

[Gooseman]

I have been riding by new conversion for a few weeks now. What i am finding is my pedal assist is always on full so always tries to get to 15mph unless i use the twist throttle at the same time to control it. I would like to change to a display so i can choose the level of assistance. I've done a fair bit of reading this forum and think i am on the right track and would be best going for a KT controller and and LCD3 display?
9 mosfet would be better than a 6 mosfet and less likely to overheat and cutout?
Link to the lcd and controller i think is correct are below

Electric bicycle KT-LCD3 display 36V 48V 60V 72V LCD Display Electric Bicycle Conversion Parts for KT LCD3 Controller - AliExpress 18

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

9 Mosfet KT Controller Fit for 36/48V 250/350/500W Electric Bicycle Brushless Hub Motor Sine Wave Controller E-bike Programmer - AliExpress 18

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

Any advice on this much appreciated i will upload pictures of my current controller. It's to control a 250w rear hub motor.

 

[Gooseman]

 

[Nealh]

It looks like you have a speed controller they can be horrible with little control, giving an uncomfortable jerky ride if not scary feeling.
Does it have a display ?
Which cheap kit is it ?

The PAS control on the KT are very good with 5 varying noticeable current levels the first four are approx. 13 - 50% and five is the whole monty 100%.

 

[Gooseman]

It doesn't have a display just a button on the throttle along with bars that show battery level.

It's a voila mart kit from ebay link below

36v 250w Rear Wheel Electric Bicycle Motor Conversion Kit E Bike Cycling Hub 26 for sale online | eBay

Find many great new & used options and get the best deals for 36v 250w Rear Wheel Electric Bicycle Motor Conversion Kit E Bike Cycling Hub 26 at the best online prices at eBay! Free delivery for many products!

www.ebay.co.uk

 

[Gooseman]

The PAS control on the KT are very good with 5 varying noticeable current levels the first four are approx. 13 - 50% and five is the whole monty 100%.

So do you think the aliexpress products i have chosen should do the job? I am not sure what sine wave means and weather this would be compatible.

 

[Nealh]

Sinewave is for hall sensored motors which you have, the six small wires in the White (dj7061) connector block 2nd picture.
You may have to change some other connectors if they don't marry up.

You haven't told us your battery specs or a link to it.

 

[Nealh]

It doesn't have a display just a button on the throttle along with bars that show battery level.

It's a voila mart kit from ebay link below

36v 250w Rear Wheel Electric Bicycle Motor Conversion Kit E Bike Cycling Hub 26 for sale online | eBay

Find many great new & used options and get the best deals for 36v 250w Rear Wheel Electric Bicycle Motor Conversion Kit E Bike Cycling Hub 26 at the best online prices at eBay! Free delivery for many products!

www.ebay.co.uk

Those cheap control systems are rubbish, with only one PAS level is has no choice but to give max current and speed. The system is in control of you rather then the other way around.

The KT will give max speed in each PAS level but only if pedal for it with the cadence, the beauty of them is each level has a differing current output so the acceleration can be set to one that you like. Obviously PAS 1 gives the best range and requires more rider effort.

 

[Gooseman]

You haven't told us your battery specs or a link to it.

Its a 36v 13ah from ebay

36V 13A Lithium Battery Fit Motor Power 500w Electric E-Bike (R001 Series) | eBay

Find many great new & used options and get the best deals for 36V 13A Lithium Battery Fit Motor Power 500w Electric E-Bike (R001 Series) at the best online prices at eBay! Free delivery for many products!

www.ebay.co.uk

 

[Gooseman]

The KT will give max speed in each PAS level but only if pedal for it with the cadence, the beauty of them is each level has a differing current output so the acceleration can be set to one that you like. Obviously PAS 1 gives the best range and requires more rider effort.

So it will always try to get you to the 15mph on any setting? I thought the power levels would equal speed. The problem i'm having is i have been going out with others that are on normal bikes which are cycling slowly and i can't keep pace easily.

 

[Gooseman]

thanks for your help and information i i am going to order the kt controller and lcd3 in the hope that changing the level of acelleration will make the difference.

 

[Nealh]

So it will always try to get you to the 15mph on any setting? I thought the power levels would equal speed. The problem i'm having is i have been going out with others that are on normal bikes which are cycling slowly and i can't keep pace easily.

Yes you can reach the assist limit in any one of the five PAS levels the difference is you can choose the/power current delivered to supply the torque/acceleration, if you don't want to hit the assist limit just pedal a bit more gently.
The power levels/five assist levels equals current supplied, if you want some help but little power use PAS 1 so that you get a bit more of a work out.
The current control make the ride experience more pleasant then the controllers that use speed control with max current all the time.

If you want the bike to be more like a normal push bike input fit a torque sensor controller kit for a hub, they are thin on the ground so spares are sparse. With this control type the power is reliant on the ride input and senses the rider input via the BB or crank torque sensor.
Bafang sell via a third party an 18a BB TS conversion electronic kit as well as spare controllers.

 

[Gooseman]

Just received new controller and screen. Now after more advise please. The new controller motor wires are the same as my old ones yellow, blue and green just ring connectors instead of bullet. If i change the connectors and just match up the colours or do i need to test to make sure they really are the same with a multi meter some how?

PAS connection is the same but different colours old one is black,white,red. New one is yellow black brown.if i plug this in and it is wrong can it cause damage or ok to just try?

 

[vfr400]

It doesn't really make sense to buy connectors and solder them on when you can cut the connectors off and solder the wires together, which is less work, cheaper and more reliable.

You can't damage the pedal sensor by connecting the three wires the wrong way.

 

[Gooseman]

It doesn't really make sense to buy connectors and solder them on when you can cut the connectors off and solder the wires together, which is less work, cheaper and more reliable.

You can't damage the pedal sensor by connecting the three wires the wrong way.

Ok cheers and the 3 motor wires the colour codes are a standard? i don't need to worry about getting them wrong just match the same colour?

 

[Nealh]

Just received new controller and screen. Now after more advise please. The new controller motor wires are the same as my old ones yellow, blue and green just ring connectors instead of bullet. If i change the connectors and just match up the colours or do i need to test to make sure they really are the same with a multi meter some how?

PAS connection is the same but different colours old one is black,white,red. New one is yellow black brown.if i plug this in and it is wrong can it cause damage or ok to just try?

If going to solder phase together make sure the motor works correctly first colour to colour.
For the PAS Yellow instead of White (sig) , Black is Black(Gnd) & Brown is Red (5v).

 

[Gooseman]

If going to solder phase together make sure the motor works correctly first colour to colour.
For the PAS Yellow instead of White (sig) , Black is Black(Gnd) & Brown is Red (5v).

I've used connectors as i had them anyway. That got the PAS working now matching the colours as you have said thank you. Everything is running smoothly and nice to be able to select the assistance level. The only i am not sure of is the lcd3 is only displaying a speed reading whilst i pedal and not when coasting if this is correct im happy with that just making sure i haven't messed up a setting somewhere.

 

[Nealh]

Adjust P2 for the odo reading if value P2/1 doesn't work coasting try P2/6.
Does the hub motor utilises an internal speed sensor ?

 

[Gooseman]

Adjust P2 for the odo reading if value P2/1 doesn't work coasting try P2/6.
Does the hub motor utilises an internal speed sensor ?

I'll try P2/6 tomorrow. I don't know if it has a speed sensor i'm guessing it does as it does give a speed reading whilst i pedal and is accurate with P1/90.

 

[Gooseman]

Adjust P2 for the odo reading if value P2/1 doesn't work coasting try P2/6.
Does the hub motor utilises an internal speed sensor ?

Ok so tried P2/6 that didn't show a reading so went through all the p2 settings and P2/5 seems to be the one whilst changing the P1 value to 95. Thanks again for all your help.