Kelly KLS-S and 750C display not showing any speed or other info.

[spacecaptain1]

As the title suggests, I have a Kelly KLS-S Cheetah controller set up with a 52V battery and a 48V generic hub motor.

Kelly has assured me that this setup is compatible, and it does work. I can connect to the controller via the Bluetooth adapter and use the Android app to change settings and run the auto-configuration process (170).

I have also wired everything according to the manual.

The issue arises when I connect the 750C display from Kelly and power it on. While the display shows the battery voltage and capacity, it does not respond to setting the assist levels, and it shows no speed or energy usage when the motor is moving.

Has anyone else experienced this issue or have any suggestions on how to troubleshoot it?

 

[amberwolf]

That means that the display is not getting any data from the controller or sending any data to it.(the battery meter is getting it's info directly from the power connection).

Setting the assist on the display requires sending data to the controller to do anything, and displaying speed/etc on the display requires recieving data from the controller.

If neither works, either the data is not being sent from the controller, or it isn't a compatible data stream, or it isn't wired correctly (tx from controller not connected to rx on display, tx from display not connected to rx on controller).

If there were ever any wiring errors between the two, the tx/rx parts in one or both may be damaged and require replacement to operate (there are high voltages in the wiring that can destroy those parts if connected to them).

If both of them come from kelly as a kit, intended to work together, then both should already be programmed from kelly for compatible communications.

if they came separately, even if both from kelly, and weren't originally intended to work together as a specific hardware set, one or the other could be programmed wrong and not able to send or understand the right data.

So, first check your wiring between controller and display, and then you'll have to check with kelly to see how to check if the controller is correclty setup / programmed to work with the display, and vice/versa.

 

[spacecaptain1]

Thanks for the reply.

I'm going on the assumption that it's wired correctly because the Bluetooth adapter works (it hooks into the same wires as the controller).

Is that not necessarily the case?

 

[amberwolf]

Assuming is often dangerous.

What if the BT adapter is wired differently than the display? The only part you know works on the display (battery reading) uses wires the BT doesn't.

To know for sure you pretty much have to open things up to verify, since it could be miswired from the factory (if it's not wired differently because its' a wrong / incompatible part). Or it could have a broken wire (would be odd to have both TX and RX broken but nothing else, is more likely they are swapped, if there's any wiring issue at all). You can also verify continuity of wiring while the display is open to see where the wires are connected inside vs where they are connected at the controller-connector end.


But it is just as likely to be a programming / setting fault from kelly, or incompatible firmware in one or the other or both.