RB600 + RB502

Hello everyone.

I’m having trouble. I have a RB600, and I want to get three plates XR2. For that purchased a RB502 told me that went well. I put all three plates XR2, but only walk two, everything that I put in rb502 (which is an extension) do not walk, however the board that I not go in the rb600 and works perfectly. Someone has any idea what can I do?

The RB600 supports 3 plates xr2?

Thank you.

Ricardo