I have a Hardinge HLV-H that is giving me an issue.I can turn the spindle on and change between high and low but I can not change the RPM.... when it wasn't bottomed out RPM would lower but nor increase. If your looking at the manual on figure 5.3- Power Case image the "W" connectors all pull in when I try to increase RPM .I'll try to load a image from manual online if I can figure how to do it from work. Thanks for any help

FYI machine has been working fine until it wasn't