AndyThilo It sounds and feels smooth when it's turning but always stops after one rotation.
Assuming that you are setting it up using ASICap or something in the ASIstudio suite, try this from ASIcap's Focuser window (ASICap is also a good way to set the name of the EAF):
0) disengage the EAF physically from your focuser, Remove the shaft coupler completely.
1) click on Advanced checkbox
2) in the Set Maximum Steps field to 60000. Be sure to hit carriage return after entering the number.
3) go back to the non-advanced settings and set the Current Position to 30000. Again, be sure to hit carriage rteurn.
The UI for the two numbers are different, but that is the usual inconsistency that you expect from ZWO.
After (2) and (3), you should have a range of +/-30,000 steps from the current EAF position.
4) click the Beep checkbox on.
5) set the Coarse steps to somewhere between 100 and 1000 steps, and try the direction buttons.
You should hear a single beep each time you click one of the direction buttons. And each click of the direction button moves the stepper motor by the number if steps that you have told the EAF to use.
If you hear a double beep, something is keeping the stepper motor from moving. If you have the EAF disconnected from any focuser or loads, then the EAF is faulty. Replace it with a better product from someone else than ZWO.
6) if the above works, reattach the EAF to your focuser and repeat step (5). If you hear double beeps, your focuser is too stiff to use the EAF, or, you have accidentally engaged the focuser lock on your OTA.
After installing an EAF, I would usually remove the focuser lock bolt on the OTA completely so that it will not be accidentally tightened. On three of my Takahashi OTAs, I have replaced the large focuser lock finger screws by short M8 grub screws to keep the grease in the focuser clean, but not long enough for the M8 screw to reach and apply pressure on the R&P focuser.
The double "Beep" is a good diagnostic tool. The single beep is kind of useless, and makes noise for no reason.
Chen
