PAS not triggering controller

[Frans]

Hello, just fitted a generic controller to my Sparta ion ebike. Works OK with a few teething problems, one of which is that the first PAS sensor didn't trigger the controller. Checked it on a scope and it gave a healthy square wave. Bought a new one which did work. Both sensors showed a good square wave of the same voltage, only difference was that the non-functioning one had a smaller width of square, but the same height. Tried all the usual programming variables, but no difference. Any thoughts? Or just incompatible parts.
Happy to discuss Sparta Ion and the software that only one (highly recommended) shop in England can update and programme, effectively "bricking" it, hence my modification.

 

[docw009]

Your issues are explained in this article from ebikes.ca.

Pedal Assist Systems - Learn

An in-depth technical look at PAS and Torque sensors. Have a look at our <a href="/getting-started/pas-options.html">PAS Options page</a> for a more simplified overview if you're trying to decide on which to use with your conversion kit.

ebikes.ca

 

[E-HP]

What kind of signal did you get from the non-functioning PAS if you pedal backwards?

 

[pw2000]

Best to use a PAS that's generic to your controller or if the wirings different on the PAS it will blow controller.

 

[Frans]

Best to use a PAS that's generic to your controller or if the wirings different on the PAS it will blow controller.

Thanks, yes, I agree but the generic eBay controller doesn't specify a particular PAS. So, I have a working one now, but I wanted to buy a spare self-contained type for the non-drive side, much easier to fit and replace. These are very cheap (around £5.00) but I know that the build quality varies.
The controller is one of these with an S866 LCD display:
24V/36V/48V 250W /350W Brushless Controller + Display Panel for E-Bike

24V/36V/48V 250W /350W Brushless Controller + Display Panel for E-Bike | eBay

<li> </li> <li>Features:</li> <li> </li> <li>This display adopts good quality materials, lightweight, rainproof, sturdy and durable.</li> <li>LCD display can clearly show the state and data, backlight enables you to see scree clearly in dim environment, buttons for quick operation, easy to...

www.ebay.co.uk

 

[Frans]

What kind of signal did you get from the non-functioning PAS if you pedal backwards?

Didn't check that, but but it didn't trigger the controller in either direction. Another post gave a link to this, which seems to clarify things.

Pedal Assist Systems - Learn

An in-depth technical look at PAS and Torque sensors. Have a look at our <a href="/getting-started/pas-options.html">PAS Options page</a> for a more simplified overview if you're trying to decide on which to use with your conversion kit.

ebikes.ca

 

[E-HP]

Didn't check that, but but it didn't trigger the controller in either direction. Another post gave a link to this, which seems to clarify things.

Pedal Assist Systems - Learn

An in-depth technical look at PAS and Torque sensors. Have a look at our <a href="/getting-started/pas-options.html">PAS Options page</a> for a more simplified overview if you're trying to decide on which to use with your conversion kit.

ebikes.ca

It’s just another check to verify what type of one wire PAS you have, since the varied width style won’t be compatible with you controller.

 

[Frans]

Yes, I can see how that would cause a compatibility problem , but how do I know what sort it is when I buy it? The sensors online only describe the number of magnets and whether LH or RH.

 

[E-HP]

I think most will be the normal, non-varied type, but with this ebike stuff, I think checking before making any wiring changes is always safest.

 

[pw2000]

Buy new controller with control centre inc throttle and PAS all compatible from

24V 36V 48V 250W 350W 20A eBike Electrical Control System DIY

20A Controller+ Display+Throttle+Brake Lever+PAS+Speed Sensor

www.risunmotor.co.uk