You are using a very old version of Mach3 and I suggest you should be using a later version. The most popular version appears to be R3.043.062 and this can be downloaded from here;
http://ftp://anonymous:guest@machsupport.com/Mach3/Mach3Version3.043.062.exeKeep a copy of your <your profile>.xml file and load the new version of Mach3 over the top of the old.
Check that you have configured Mach3 and the plugin correctly by going through the AKZ250 manual again, step by step.
Mach3 USB Motion Card AKZ250 Installation Manual Pay particular attention to Section 6 (
Feed rate, spindle speed rate, or jog rate can by controlled by the adjustment-knob).
Download and install the latest version of the plugin driver (the old version needs to be deleted before installing the new).
http://leafboy77.com/index.php/en/home/16-english-categories/mach3/usb-motion/card-akz250/1-mach3-usb-motion-card-akz250If this fails to resolve the problem then attach your <your profile>.xml file so we can check your Mach3 settings. This file needs to be copied from your Mach3 folder, renamed to something unique (andyboy.xml) and attached using the Additional Options tab.
Hope this helps (I am assuming I have identified the correct motion controller attached to your machine).
Tweakie.