Controller wiring on 905se

[Pharisee]

Hi y'all,
Earlier today I took the rear wheel off my 905se to put a new tyre on. I know you can do this without disconnecting anything but as I wanted to give it a good clean as well, I took the covers off the controller box and unplugged the motor cable (a large white 3 pin connector and a smaller black 5 pin connector) so that I could take the wheel away from the bike. The controller compartment is a bit short of space, to say the least, and of course, I had trouble getting everything back in. I noticed that a number of the wires had quite large grey, plastic components around them. I'm assuming that they are some sort of ferrite choke. Are they some sort of radio interference suppressor and really necessary? It would be much easier to get all the wires back in if these chokes could be discarded.

John

 

[Old_Dave]

Hi John

Whilst it would seem that most controllers don't use external ferrite rf suppression, maybe your one had to have them to fudge some internal design pcb issues...

So I'd be inclined to leave them alone and ask a passing woman to get the wires back in the box

I suggest this as women seem to have the skill of getting all sorts of stuff back into its original packaging, which I suppose is learnt from years of trying things at home and then changing their minds and returning it, lol


Sent from my iPhone using Tapatalk

 

[Wisper Bikes]

Hi John, have you managed to sort the issue out? If not please feel free to contact me directly. The external suppressor should be left in place if possible. It was included on these models as reccomended by the SGS labs.

Thanks Dave for your assistance in this matter, much appreciated!

Best regards

David

 

[Pharisee]

On closer inspection, I noticed that the red wire from the battery connector had, at some time, been trapped between the controller case and the bike frame. The insulation had been flattened and while the conductor wasn't visible, I thought it best to replace the wire. I also took the opportunity to replace the 'white block' connectors on this cable and the motor power cable with individual, insulated bullet connectors as used on modern motorcycles. I also removed the three ferrite chokes on the motor power cable. With the space saved, I was able to replace the controller easily. So far, the only difference I've noticed after quite a few miles travelled is that the intermittent, brief, power loss that had occasionally occurred has so far not materialised.... which has to be good and was, I suspect, probably due to the dodgy white connector blocks. So far... so good!

 

[Deleted member 4366]

The ferrite chokes may well be to ensure compliance with electromagnetic emissions regulations and nothing to do with performance.