@imhififan good question with J4, J5 and J6.
I recognized you have mention something similar for the E600 above in context of soft start resistor settings. Any idea if I have to change these jumpers, too?
I think it makes sense to remove J5 and J6 but add J4.
Then there is the maximimum resitor value set.
I have manual of ps510 and there is also a kind of soft start circuit like this.