I have a 3m model c control and I cant enter parameters in it. I put the e stop on and flip the parameter write switch on and the screen displays the p/s100 alarm as it should. When I go to the parameter page I can key in the parameter number at the bottom of the screen but when I hit input it does not enter it into the parameter spot. I talked to a member on here who has experience with this control and he said follow the instructions for loading parameters but it does not work. The machine was up and running before I tried the parameter change but the servos shut off for an unknown reason. I could not restart them. Did anyone else ever have this problem or have any ideas why it won't take parameters?