RichardC

I managed to fuse my original VLCD-5 and had to order a new one; connected up and it works - except that it gives power only in bursts (especially when using the throttle) and I'm not sure what's going on. I boosted the speed setting but that doesn't do it, is it something to do with this in the instruction manual" 4.12、 6 km/h throttle setting Select function of 6km, default is OFF Is this an issue, or is it something else?

That's a good point, I hadn't thought to check the 5V supply. And now I have, I can confirm that it (the supply) is dead - so, presumably, that shows the whole controller is caput?

I can't post a picture of the spark, but what happened was that the mobile end of the charging cable, which was hanging loose - the other end was plugged into the controller - touched on some bare metal, causing a short circuit. Here's a pic, not of the original cable, which I think I threw away, to illustrate: the exposed metal end of the USB-C plug on the end of the cable touched some metal, hence the spark.

I've now done what I should have done in the first place, and that's to test with a voltmeter whether there's any output from the cable running from the base (with the battery in place, obvs). And the answer is that there is indeed output (ca. 53 volts) from the cable, so it answers my first question of whether there's a fuse in the base: clearly there isn't, or if there is one, it's not blown. So that means I have to move on to the second question: is the controller hopelessly damaged ? Or, putting it another way, is there any other part of the system (the motor itself, for example?) that is likely to have been affected? I'm guessing that it's most likely to be the controller, but before I shell out for a new one at around £45, I'd like to have a stronger sense if this is what's wrong.

The system has been working perfectly for 6 months until... I was out on a ride and had left the cable to charge a mobile plugged in. Unfortunately, when I stopped the other end shorted out on the frame with a dramatic spark, and the whole system went dead. I thought immediately that a fuse must have blown, so I took the battery (photo 1) apart only to find ... no fuse. But I wondered, is there a fuse inside the base (photo 2)? I don't want to go to the business of taking the base off and trying to dismantle it if there's no fuse there anyway: does anyone know if there's likely to be a dude there? And if not, and there isn't a fuse anywhere, is the next step to order a new VLCD5 controller? I'd much appreciate any advice here...

Sorry for being so slow in responding: it's definitely on the TongSheng, but I can't specify the throttle, I just fitted what came with the kit: sorry!

I wasn't sure what the throttle did (and someone said it didn't do anything). But I tried it out today and it worked rather well: the trick was to pedal away, using battery assist, and then to press down on the throttle; after half a second, away it went: now in full assist mode. In other words, it took over from my pedalling and carried on driving the bike forward, only ending that when I started pedalling again. It was quite impressive, and it would be tempting if tired (or lazy lol) to let the battery do all the work. Of course, it wouldn't last as long as in normal pedal assist mode, but you can't have everything...

Thanks, Peter and Jodel, that was very helpful. I think I'll leave it as is, and see how that goes.

Hi, I'm planning a TZDZ2 conversion, but the 42T standard chainring seems rather small: I normally use a 48T on my triple chainset: is there likely to be any problem modifying to a 48 or 50T chainring (where, for example, would I get one to fit the TSDZ2?) and would there be any issues in its use? Hope I can get appropriate advice here...