CA shows wrong speed. Cycle Analyst

[michael.i@me.com]

Hey all. Just got my new 35amp Infineon controller from Grin today and hooked it up to my 500W front hub motor on my full Suspension MTB. Took a little while to get the phase/halls correct, which I think I have, but I am having a problem with my CA.

I went into the setup and configured the Shunt value as per the supplied info label on the back from Grin, but the CA says that I am going exactly twice as fast as I actually am. I tested this with my GPS to be sure after it seemed like there was no way I was going 64Km/h

I have to the best of my knowledge changed all the settings, I set the Wheel diameter, and changed there Shunt value, but other than that, I am stumped.

It is a CA-DP model that plugs directly into the infineon controller. I use this same unit on my other bike, and with the settings setup properly, it reads the correct speed on that other bike, but not this one.

What am I doing wrong?

Could it be the poles setting? Is there a setting for hall angle or something like that? I really don't know what these are exactly, but I have seen this discussed elsewhere.

PS, I did search for a good five minutes before starting a new thread, but I couldn't find anything in that time that answered my question or came close to solving my problem.

Thanks

 

[John in CR]

Could it be the poles setting?

Yep. That and wheel size are needed to calculate the speed reading the hall pulses.

 

[michael.i@me.com]

Is there an easy way to tell how many poles there are? I tried doubling it from23 to 46 and it is much closer to what my gps say, but I just guessed at that.