Stefan,is the usual start up procedure to push the start button?
If so,you need to look for a fault on the e-stop line.
That can be caused by different faults.Usually by an overload tripping or a fuse blowing.In one of the pictures you posted it shows magnetic contacters.Next to these you can see the overloads,they have a small dial and a red button.With the power of,press all the red buttons you can see and check all the fuses.
Do you understand electrical drawings and can you use a multimeter?