Okuma feed problem

I just purchased an older Okuma with a OSP5000M-G control. All is working great with the exception of programmed feed rates. No matter what I try, the machine is ignoring the feedrate and defaulting to a constant rate. The programmed rate is showing on the CRT so I know I am entering it correctly. I believe it must be a parameter issue but I can't seem to find out where to change.

I've tried several G and M codes to try to turn off constant speed control with no success.

I'd appreciate any help.