Ok, got the 3 powerbars working Thanks
5.1 @ PAB, first 4-4 to port s5-s8 and second 4-4 on an extra s-port

Now I'm trying to work out the configuration of the dosing pumps.
They are connected to each other and then the last one to the S1-S4 port.
Now if I let the s1 run, all the first pumps of the 3 pumps start working. Can I assign other numbers to the other pumps or do I need to connect them all to a different s-port?