There are plenty of sample wiring diagrams for spindles in the Documents and Download TAB for the C11G.  I am sure you will find one that matches your spindle.  If you do not, please open a support ticket and we will give you a hand with this.

Hi, I am conferting an kl/6090 machine to uccnc with a UC400 and a c11g BOB. All seems ok, except I can't figure out the wiring for the spindle inverter... any help?

Much appreciated!

Max