[en] This paper presents a detailed study of the accelerated beams dynamics, prior to extraction, for the K-500 cyclotron under construction at M.S.U. The results, for a number of representative beams, indicate that adequate turn to turn separation can be achieved, while keeping distortions to a substantially negligible level. The presence of the νsub(R) + 2νsub(Z) = 3 resonance, and its effect in limiting the cyclotron dynamic range is also discussed. (orig.)