I'm not sure on a Curtis 1204, if you have a 3rd it is most likely like the old Curtis 1221b.
The one nearest the bus bars is the the acceleration rate (CW is faster.) The one at the opposite end (left) is the plug current adjustment (CW is more), I've never messed with it because I've never used the A2 terminal plug braking option. The one between them, closer to the plug current adjustment in the 1221, is the controller current limit. I'm a firm believer that more power is more better so mine goes all the way CW
The one nearest the bus bars is the the acceleration rate (CW is faster.) The one at the opposite end (left) is the plug current adjustment (CW is more), I've never messed with it because I've never used the A2 terminal plug braking option. The one between them, closer to the plug current adjustment in the 1221, is the controller current limit. I'm a firm believer that more power is more better so mine goes all the way CW
