Analog Strip X Y Z

Hi, I bought an analog LED strip where I crashed the original controller and I thought to use it with the Analog strip controller, which I bought here. But it looks like it is not achieving the voltage of 24V on the outputs although the power supply is 24V.

My LED strip has only 3 pins marked with X, Y, and Z. I figured out that the voltage between those pins defines the color of the strip, which is max 24V....there is no extra Vcc or Gnd.

Can anybody help how to ge this strip WLED controlled?

Thanks, Matthias