You should have 2 switches on the back, probably SQ60 and SQ61. When you command the collet open (M11) one needs to be on and one needs to be off depending on if you are using OD or ID chucking. If you are using OD then SQ60 should be on and SQ61 off. If you are using ID chucking then SQ60 is off and SQ61 is on. When chuck is clamped (M10) then both should be on. Hope this helps.