The Lad711p designation implies a specific integrated circuit or family of logic controllers used in this drive system.
Based on the search term provided, here is the relevant technical information regarding the BDL51 / LAD711P components, which are most commonly associated with Schneider Electric lighting control (C-Bus) and electrical protection systems.
A proper schematic for this board is divided into five distinct power stages. Here is what you should expect to see when you locate the diagram (or reconstruct it).