Sensor prague/moscow

[Mumshoovering]

I believe I need a new sensor.
(PAS Sensor DAS-KIT P12L-10)
When going uphill with constant pedalling, the power assist crescent on the controller will drop out, then pick up repeatedly, slowing the bike and making it harder and harder to pedal.
Problem is none in stock anywhere.
Is there a compatible sensor that would fit?

 

[PCeBiker]

Try cleaning and adjusting the sensor if possible. It's supposed to have about 1 mm of clearance or so.
Check your electric connector to see if it's corroded, and check the wire for obvious breaks or cuts.

 

[WCoast]

I'm having a similar issue. Cleaning the cadence sensor didn't help, and all the magnets seem to be in place. Since no controllers are available, I'm thinking of buying a generic cadence sensor and splicing it in. I'm not sure if the problem is with the controller or the sensor, but if this doesn't work, I'm only out $12.

 

[-sandro-]

I'm having a similar issue. Cleaning the cadence sensor didn't help, and all the magnets seem to be in place. Since no controllers are available, I'm thinking of buying a generic cadence sensor and splicing it in. I'm not sure if the problem is with the controller or the sensor, but if this doesn't work, I'm only out $12.

Did you try?

 

[-sandro-]

Try cleaning and adjusting the sensor if possible. It's supposed to have about 1 mm of clearance or so.
Check your electric connector to see if it's corroded, and check the wire for obvious breaks or cuts.

What could be the issue? Being too far or too close?

 

[PCeBiker]

What could be the issue? Being too far or too close?

Too close shouldn't be an issue as long as it doesn't hit or rub.
Too far and the sensor can't register a signal.
See if the sensor wobbles as it rotates. Make sure it's running true and square.

 

[-sandro-]

I was able to onder a new PAS Sensor from NCM Spain however I don't think it will be easy to replace, there no plugs aren't they? Is it hardwired inside the controller?

 

[PCeBiker]

I was able to onder a new PAS Sensor from NCM Spain however I don't think it will be easy to replace, there no plugs aren't they? Is it hardwired inside the controller?

That's true. The sensor was wired directly into my controller. (ET.CYCLE T1000, with Das-Kit)

 

[-sandro-]

That's true. The sensor was wired directly into my controller. (ET.CYCLE T1000, with Das-Kit)

ehmm, how I am supposed to replace it then?

 

[PCeBiker]

ehmm, how I am supposed to replace it then?

Cut the wire off the old sensor right where it goes into the sensor and splice the three wires from the new sensor onto the old wire.

This is a picture of my PAS sensor.

I think yours is different but it's the same idea. (Mine doesn't look to be adjustable?)

You should have enough wire length to splice the wires together.
The wire colors should match because you are getting an original sensor.

It's best to solder the wires because there is a VERY tiny signal coming out of the sensor and it could be lost through a bad connection.

At least twist the wires together really good then coat them with silicone to seal them. (electrical tape doesn't seal good enough)
The PAS sensor is in a pretty wet area and water can corrode the connections and cause problems.

 

[-sandro-]

Jesus, would they sell it as a replacement if it requires this kind of work? Also a replacement with a connector (from the official picture at least).
Anyway why did you need to replace it?

 

[PCeBiker]

Anyway why did you need to replace it?

I didn't, I replaced my controller and display with a KT controller and display.
I didn't hook up my PAS sensor to the new controller. I just use my throttle.

Alternative Display and Controller for NCM (DAS-KIT)

Wanting to increase the PAS Max speed on my NCM bike I be quite satisfied with around 30-35kmh it currently 25kmh The Das-Kit system appears to be complete locked down so I'm considering if Sourcing a alternate KT display and controller that would plug and play with the current hub motor...

forums.electricbikereview.com

 

[WCoast]

Did you try?

I believe I need a new sensor.
(PAS Sensor DAS-KIT P12L-10)
When going uphill with constant pedalling, the power assist crescent on the controller will drop out, then pick up repeatedly, slowing the bike and making it harder and harder to pedal.
Problem is none in stock anywhere.
Is there a compatible sensor that would fit?

I fixed this problem by splicing in a generic sensor: My NCM Moscow was experiencing similar intermittent power cuts. I couldn't locate a replacement controller with the hardwired sensor, so I bought a generic Pedal Assist Sensor (PAS) from Amazon and wired it in. I tried cleaning it first but that didn't work so for $14 it was worth a try.
The installation involved cutting the original sensor wired to the controller and splicing in the new one. While the generic sensor appeared similar in size, it required minor modifications. I used sandpaper wrapped around a dowel rod to slightly enlarge the opening. It didn't need much sanding to make it fit.
The wire color didn't match so I had to determine the correct connections. Thankfully, the modification worked, and the pedal assist functionality returned. I'll include photos of the wiring and the sensor I bought.

 

[-sandro-]

I replaced the pas sensor and it worked.

 

[Stencil]

I fixed this problem by splicing in a generic sensor: My NCM Moscow was experiencing similar intermittent power cuts. I couldn't locate a replacement controller with the hardwired sensor, so I bought a generic Pedal Assist Sensor (PAS) from Amazon and wired it in. I tried cleaning it first but that didn't work so for $14 it was worth a try.
The installation involved cutting the original sensor wired to the controller and splicing in the new one. While the generic sensor appeared similar in size, it required minor modifications. I used sandpaper wrapped around a dowel rod to slightly enlarge the opening. It didn't need much sanding to make it fit.
The wire color didn't match so I had to determine the correct connections. Thankfully, the modification worked, and the pedal assist functionality returned. I'll include photos of the wiring and the sensor I bought.

Same. Unfortunately, first PAS sensor didn't work (never got power, no matter how I arranged the connections). Then I just bought the same one you did off Amazon and it worked right out of the gate. The wire colors didn't match, but it was pretty easy to figure out correct connections, since black is almost always ground, then you only have to futz with other 2 wires. I used quick solder connectors to join the splices. Very handy, basically a heat shrinkable tube with a solder ring in middle. Just insert both ends into the tube and heat with heat gun (which I used), or even a lighter.

Like some other poster said, why the heck NCM didn't just make the sensor with a plug is beyond me, since failure seems to be pretty common.

 

[PCeBiker]

Then I just bought the same one you did off Amazon and it worked right out of the gate.

Keep in mind that a generic PAS sensor is designed to be installed on either the left or right side of the bottom bracket.

If you get the wrong one, you'll only get power to the motor when you're pedaling backwards, and swapping the positive and negative doesn't fix it.

The sensors have angled pawls that grab the axle in one direction and slip in the other direction so that you don't get power when you bump the pedals backwards.


There's different measurements for everything from the size and thickness of the sensor itself to the axle diameter it is meant for.



I'd suggest to anyone with a Das Kit PAS sensor to buy the one linked above because it's proven to fit and work properly.


Here's a link to those quick solder connectors.
I've never tried them, but they look pretty cool.

https://a.aliexpress.com/_mLxzh5W