installing a throttle

[littlebmw]

Hi I am on my 3rd pedelec and my newer one has PAS only unlike my last bike that was dual options. Due to a knee injury I want to add a thumb throttle. I have bought and wired the thumb throttle to the bikes controller matching the Black/Green/Red wires of the controller output (which I assumed was throttle as that seems most common) to the throttle connections with the same colour wires but with no joy.

I have another 3 wire connector spare on my controller coloured Blue/Red/Yellow but do not want to just hack these in case I do damage to the controller.

I also wired in a front light as the controller also had front and rear light connectors available that are controlled from the handlebar controller which has a light switch and that worked fine.

The handlebar controller itself has 5 power levels and battery indicator too.

questions:
1) If the wires I have used are the right ones could they be disabled in some other way?
2) If I try the other wires that have 3 connections and are currently spare (the blue/red/yellow ones) any thoughts on which colour is GRND, + and control?

3) Any suggestions to get the throttle to work?

thanks for any help pics of connections and controller attached

 

[Deleted member 4366]

Blue, red and yellow are normally the brake connectors, especially if you have two of them the same. Show us all the connectors on your controller.

 

[anotherkiwi]

If it is an LCD-3 then yes the throttle can be turned off in the advanced options. You have three options PAS only, Throttle works only with PAS and throttle only.

 

[littlebmw]

hi thanks for the reply. the only 2 connectors free with 3 wires available are the 2 I mentioned and added the photos for. the other 2 free connections were 2 wire ones for the lights (one of which I have now used for the front light). I have added more pictures showing all the connectors including the 5 wire controller and the handlebar controller unit itself too. did not bother with the motor phase wires (no HALL) or the battery ones as they are self evident.

thanks

 

[littlebmw]

If it is an LCD-3 then yes the throttle can be turned off in the advanced options. You have three options PAS only, Throttle works only with PAS and throttle only.

hi the controller is a non LCD 760 model branded to the manufacturer. (posted a pic on previous pst just now)

 

[Nealh]

Hi I am on my 3rd pedelec and my newer one has PAS only unlike my last bike that was dual options. Due to a knee injury I want to add a thumb throttle. I have bought and wired the thumb throttle to the bikes controller matching the Black/Green/Red wires of the controller output (which I assumed was throttle as that seems most common) to the throttle connections with the same colour wires but withView attachment 18179 no joy.

I have another 3 wire connector spare on my controller coloured Blue/Red/Yellow but do not want to just hack these in case I do damage to the controller.

I also wired in a front light as the controller also had front and rear light connectors available that are controlled from the handlebar controller which has a light switch and that worked fine.

The handlebar controller itself has 5 power levels and battery indicator too.

questions:
1) If the wires I have used are the right ones could they be disabled in some other way?
2) If I try the other wires that have 3 connections and are currently spare (the blue/red/yellow ones) any thoughts on which colour is GRND, + and control?
View attachment 18178
3) Any suggestions to get the throttle to work?

thanks for any help pics of connections and controller attached

My Lishui 947 for unsensored hub, throttle is Red, Green & Black a large white plug.
Speed sensor also Red,Green & Black, black sm3 plug like yours.

Yellow is GND, red 5v and blue signal, however my controller has no plug this colour.
Problem is controller wire colours from the same manufacturer can differ.

 

[Swinman]

Just a quick one did you turn the crank when you tried the throttle as some bikes don't work till it is moving to get the bike turning over , just a though

 

[littlebmw]

Hi Swimman - yes I tried going for a ride just in case it was a > 3mph thing before it kicked in or cruise only - no joy.

Hi D8veh - the 2 brake connectors are already connected up to 2 (2 wire) connectors from the controller so pretty sure the spare 3 wire connector is not brakes.

Hi Nealth - I will try the other connector tonight using Yellow as GND, red 5v and blue signal. Fingers crossed! Really want to be able to use this to keep going to work on but without a throttle to assist not sure I will be able to.

thanks to everyone for helping so far, much appreciated.

 

[Nealh]

Before connecting just check Y/ R have a voltage reading between them, Y/B & R/B should not give a reading.
We know from your pic that the controller is throttle compatible as it states it on the label.

 

[littlebmw]

cheers Nealh, will do.

 

[Deleted member 4366]

Hi D8veh - the 2 brake connectors are already connected up to 2 (2 wire) connectors from the controller so pretty sure the spare 3 wire connector is not brakes.

Many controllers have two pairs of brake connectors. 2 x 2-wire ones for 2-wire brakes and 2 x 3-wire ones for 3-wire brakes. 3-wire brake connectors are nearly always red, blue and yellow. Two wire ones are mostly black and white, but also often black and yellow or black and blue.

I was going to tell you how to test whether they're brake connectors, but there's no point if you're sure they're not.

 

[littlebmw]

cheers d8veh,my controller as you mention has two pairs of brake connectors using 2 x 2-wire connections. I should have added those to the pictures but as they were already hooked up I left them off

 

[Swinman]

Before connecting just check Y/ R have a voltage reading between them, Y/B & R/B should not give a reading.
We know from your pic that the controller is throttle compatible as it states it on the label.

Hi I'm about to put a throttle on my Viking harrier and the way you say to test is for the power plug on the bike but how do I test for the throttle before I connect it thanks

 

[Nealh]

Show us the end plug and wires for throttle.

 

[Swinman]

Show us the end plug and wires for throttle.

Thanks the throttle should be here today so will post a pic when it is chat later all the best Paul

 

[littlebmw]

well mine is still not working. I tried the 2nd set of 3 wires and no joy, rechecked the voltages and can see 5v on the power line but no matter how I connect it I get no response :-(

no other connections left that have suitable connection points on the controller. Thinking about whether it is the throttle itself that might be at fault.

 

[Nealh]

Have to start my 3 day shift soon so won't be online until after 10pm, so it will be later.

 

[Swinman]

well mine is still not working. I tried the 2nd set of 3 wires and no joy, rechecked the voltages and can see 5v on the power line but no matter how I connect it I get no response :-(

no other connections left that have suitable connection points on the controller. Thinking about whether it is the throttle itself that might be at fault.

Ok I'm in the same boat as your power display has on,off and low med hi speeds so when I plug my throttle in I think it may not work as the control unit is still taking commands from the on,off switch so it may be a case of back to basics i.e. Unplug everything but put a note on what goes with what and with just power and throttle connection try the throttle then just add one thing at a time first peddle sensor, you may need a new power display and start button a lot of throttles have this built in so get one of them , I know this is slow but it's the best way to get to what we want I'm just glad you get to try this first and maybe save me some time lol all the best don't give up

 

[Nealh]

https://bmsbattery.com/ebike-kit/543-36v250w-lsw-675-sine-wave-controller-with-lcd-ebike-kit.html

If you go to bmsb you can open the download for the lsw675 controller wiring diagram, though wire colour may not be uniform a cross the range of controllers.

In littlebmw's case red/blk/gr suggests its a throttle ? and blue/red/yellow the pas ?

 

[Nealh]

In most cases red is always used as 5v, black is gnd though yellow is used if no black. the signal is then any other colour.