Pedal assist sensor,only works when pedaling backwardswards

[NeilP]

I plugged the pedal sensor in today, and it only works when I pedal backwards.

I have tried it on the Lyen controller EB812-AS-1 and the Xlyte controller EB218-A-2. Both 18 FET units. Lyen unit with USB lead, not USB header on the Xlyte unit (yet)

Now I imagine that I need to swap a couple of pins over..but how do identify which two?.

The pedal sensor has three wires, black, red and a signal wire. I am assuming this is a hall sensor seder unit of some sort?. When connected to the throttle test wires on a Lyen controller tester, the green throttle LED pulses when 5v from the tester is fed down the red and black and the pedals are turned.

what do I swap? power and signal ?

 

[FMB42]

Flip the (dynamic/spinning) crank mounted PAS sensor disc/component over and try it again.

 

[NeilP]

Trying to avoid that, it took me a hole day to get it to fit on the current crank with the 3 ring front crank. I had to try about 4 different cranks and different threaded collars to get it all to fit. I was hoping it could be done electrically.

Just checking...are you referring to the the pickup sensor with the wire on...or the actual disk with the magnets on?

 

[FMB42]

Trying to avoid that, it took me a hole day to get it to fit on the current crank with the 3 ring front crank. I had to try about 4 different cranks and different threaded collars to get it all to fit. I was hoping it could be done electrically.

I've heard that the "disk with the magnets on it" can be inadvertently installed "backwards" which, will cause the system to only work in "reverse". However, this was with a Golden Motor PAS...

Just checking...are you referring to the the pickup sensor with the wire on...or the actual disk with the magnets on?

I'm talking about the dynamic (i.e. spinning) magnetic disc.

BTW, I've also heard certain older (Golden Motor) PA systems have a strange quirk about them. Meaning that they only operate in a "full power/speed" or "no power/speed" mode (i.e. they're not a "proportional" speed control) unless: you have the thumb or twist throttle applied to some degree. The problem with this is that the PAS "throttle" can be inadvertently applied whenever the crank is turned (whether you intended to accelerate or not).

I thought about wiring a switch to my thumb throttle that would "disconnect" the PAS whenever the throttle was fully closed but, gave up on the whole PAS setup instead.

Not sure if this is relative to your PAS system tho...

 

[NeilP]

ok thanks

I ll try that tomorrow

Yes, it sounds very simiar

 

[John in CR]

Neil,
Is it working properly in reverse? If so, then it needs to go on the left crank. I've never used one, but the installation instructions I found show it installed on the left side, which should be easier to fit.

 

[NeilP]

yes, it does work properly, and I could only fit it on the RHS...no way I could get it to go on the LHS...
I have a big stock of scrap/crashed bikes (20+ ) plus piles of spare cranks etc.
It took me more than half a day and 3 or 4 different swaps of bottom bracket and crank till I found a combination that would fit at all with the pedal sensor..so it is going to have to stay on RHS...will have to see if I can make a new bracket to fit it the other way around...u

unless the magnet disk swap works..I can't see that if it is a standard hall, then there is a possibility if a wire swap.

But how it is directional I cant understand? any ideas?

 

[John in CR]

I'd think they intentionally make it directional, so it's more bike-like and only get forward assist when you pedal forward. I looked at the instructions again, and it looks like just flipping the disc does the trick http://bikeconverters.blogspot.com/2009/08/installing-pedelec-sensor.html. I guess it must be a N/S pole orientation thing.

 

[NeilP]

Um yes, looks like it.

Did you ever contact that Jim who is also in CR? I sent him a mail but not heard back form him yet. He does not seem to check mail that often

 

[John in CR]

Um yes, looks like it.

Did you ever contact that Jim who is also in CR? I sent him a mail but not heard back form him yet. He does not seem to check mail that often

I'm just waiting to get a couple more bikes going in case he says let's do a meet. My too-ugly-to-steal workhorse bikes with cranked up performance take some riding time to get comfortable and aren't appropriate for intro rides.

 

[FMB42]

Does your bike have sealed bottom bracket bearings?

If not, then you might want to re-pack these bearings with waterproof (marine) boat trailer wheel bearing grease while you've got the crankset disassembled...