5vacon • 68 InstallationTel. +358 (0) 201 2121 • Fax +358 (0)201 212 2055.4 Control unitThe control unit of Vacon ® NX Active Front End consists of the control board and option boards (seeFigure 49 and Figure 50) connected to the five slot connectors (A to E) on the control board.The control board is connected to the power unit through a D connector (1).Figure 49. Control board Figure 50. Basic and option boardconnections on the control board11210.emf