Changed a blown frequency inverter, machine worked but motor was too
fast for our application.
Moeller Df4-120-37

It needs a keypad to program it, bought one.

I had my nose in the manual
https://adegis.com/media/asset/5eaaf...ba1c707e07.pdf
and thought I was changing the frequency but all I get now is Eer on the
keypad display, can't move on from that.

Is anyone familiar with these things? I feel like I could do with a
factory reset or something.