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  1. A

    Short error

    It's already in the bin. While waiting for a proper controller from China I got a cheap brainpower one from Amazon and a new motor cable to rule out any problems there. Everything is working now, it's very basic but at least it's running. Just need to wait for my replacement KT so I can have my...
  2. A

    Short error

    Well turns out the controller was at fault most likely as it has now blown, replacement is on its way. I am also replacing the motor wire to rule out any connection issues but I'm pretty sure a MOSFET is blown. Inside the controller it looks like there has been a short near the shunt too as...
  3. A

    Short error

    Given KT controllers reputation as a solid budget choice I'm surprised if that's the case unless it's a mismatch of parts. Given that this motor is supplied on a UK legal bike I doubt it's overpowered for the controller although it is a pretty fast wind at 27mph no load. I may try the larger 25a...
  4. A

    Short error

    I have done that and found nothing. Interestingly I emailed the manufacturer about the issue, they said that the motor is pulling more than the controllers rated current on startup so it cuts the motor. Surely this cannot be right? I would have thought that the controller limits current in such...
  5. A

    Short error

    Ok now I have checked every connection inside and out and can't find a problem. One of the battery terminals was slightly loose but tightening it did not fix the problem
  6. A

    Short error

    From what I heard from the Halfords guy when I complained of side to side play it's modular. There are 6 screws then it just slides out so quite simple. I just need a cassette tool to access the plate then I'll take a look
  7. A

    Short error

    It definitely isn't obvious. It's frustrating as hell
  8. A

    Short error

    I just remember replacing with a new controller and the display showed a motor error. This went away instantly upon use. Several months later I start to get it randomly. Then I upgrade to this KT and it does it with a certain amount of current. It's like something is arcing when enough current...
  9. A

    Short error

    One more piece of information. Before these 2 controllers I did a shunt mod that went bad and shorted out the controller, could this be the cause of the damage?
  10. A

    Short error

    I tried this already but didn't notice anything. As its intermittent that's probably why the multimeter didn't pick anything up either. Time to buy a cassette tool and strip it down I think
  11. A

    Short error

    According to these tests all is normal, controller gives "e3" as no motor detected. No resistance between motor axle and phase. Measured the resistance between each phase too as seen that done and all bang on 0.7
  12. A

    Short error

    Ok controller reads 50.0v and drops slowly if I keep the probes on. I guess this means it's not shorted right? That's a lot of voltage to hold on to but I had just removed the battery. Battery reads 52v at the prongs and the charge port which is normal. Testing at full current at the point of...
  13. A

    Short error

    I thought if the BMS was at fault the display would cut too?
  14. A

    Short error

    Since the wires are soldered directly, as my battery has a switch can I just switch off and take the insulation off the joins and measure there? If it is shorted won't there be visible evidence inside? And if so, is it fixable? As for battery I don't really have those things to test, anything...
  15. A

    Short error

    Ok so what can I check next?
  16. A

    Short error

    I replaced and soldered the phase and hall wires directly to the controller, no damage visible on the insulation as far as I can tell. Perhaps inside the casing is a different story. Also it was intermittent with the old controller, the higher current could be making it easier for things to arc...
  17. A

    Short error

    The old battery had a lower current limit anyway. What concerns me is the battery is rated 25a continuous and 50a pulse so it should be capable by their specifications. I haven't checked cell groups yet but I can tell you it sags by up to 4 volts when I do get it to run. Is that excessive? Like...
  18. A

    Short error

    I own a Carrera Vulcan emtb which I have heavily modified, I am being plagued by cutouts. I run a pswpower 48v 13ah battery. My old controller, a brainpower one from eBay would do this at random, it would make a sort of car ignition noise and freeze up when trying to get going, it would show an...
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