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Quick links. KU63 controller problem General Discussion about electric bicycles. The other will go into a future conversion project. I thought it would be a simple swap with the existing controller. But it did not work. Here are the details: 1. The controller is set up for throttle only. No PAS. The only additional wiring I had to make was to connect the 'Enable' line to the 36V power line to power up the controller. The controller powers up fine with all the 5V reference signals appearing when the 'Enable' line is connected to the 36V line.
And the onboard LED flashes to indicate powerup. Turning the throttle did not power up the motor. A connected power monitor shows no current draw.
I checked the throttle signal and it was fine - ramping up from about 0. Reconnecting my original controller has everything functioning. So nothing is wrong with the wiring harnesses on the bike. Observations see attached picture : The sticker on the controller says 'PAS start' on it.
I wonder if this controller was set up such that it requires a PAS signal to startup before allowing throttle to control the speed. I also noted a jumper wire on the board connecting pad 'L' with GND. In other pictures of the KU63 I have seen on the Internet, this jumper is not there.
I cannot figure out why the controller will not work with my throttle-only setup. Has anyone on this forum used the KU63 in a throttle-only setup? Thanks for any suggestions. Last edited by dingrels on May 30 pm, edited 2 times in total. It is switching one of the optional features on. Hopefully it's PAS. None of mine have PAS start written on them. I just opened one up and it's idetical to yours apart from that mauve wire that mine doesn't have. Please let us know what happens when you de-solder it because I want PAS start for one of my bikes.
I don't think it's significant, but I'd like to see what it is. On yours, going down from the top right corner in the photo: First pad I got is one end of the shunt about 1cm down; next is other end of the shunt; then that track continues down and then at an angle to the 0v battery wire; below that is the capacitor negative.
This means 4 active pads in the sequence. You photo seems to show 6 active pads in the same sequence not counting the purple wire. I'd be interested to see what's in that one just below half-way down next to the shunt in the wide 0v track just before it angles away from the edge. Here's what I got:. Last edited by dingrels on May 30 pm, edited 3 times in total.
There must ne a software difference too.
S-KU63 Torque Simulation Controller 24V/36V 15A
The S-KU63 may also give insight into other Chinese motor controllers. China brushless motor controller schematic. If someone finds a bug, please report! Reengineering the China motor controller. KU63 motor controller bottom. KU63 motor controller top, without some capacitors.
KU63 controller circuit board connections
Post by mr. Quick links. There is no need to fit a bigger controller as a W peak motor maximum allowed by LAW at 36V is just under 7Amp at maximum — Ok peak can be a little higher on load but you are also restricted with a 10Ah Battery. With the wires connected the speed is limited, with them disconnected it is not. You do not have the required permissions to view the files attached to this post.
China KU63 motor controller circuit (reengineered)
Quick links. KU63 controller problem General Discussion about electric bicycles. The other will go into a future conversion project. I thought it would be a simple swap with the existing controller.