Dear zorozabal,

It seems that the catching, flying restart,function is activated. P583=1.
Usually the the MASTERDRIVES starts then with the max frequency of p452in clock wise direction and then counter clock wise with an adjustable speed and current. Depending on the load, the current ia able to move the rotor.
The direction can be choosen by the control word 1 Bit 11 (p571) and bit 12 (p572).
Details are found in the function diagram -620- as well as section 7.2.6 in the MASTERDRIVES VCs 3.4 compendium.