If you have Supermotors, V. 2 or 3, you should have a limiting screw above the sensor wheel. It is affected by the amount of pressure on the sensor wheel and can be adjusted by adjusting the height of your motor using the alignment instructions found here: http://www.intelliquilter.com/procedures/MOTOR%20ALIGNMENT.pdf.
When in manual mode, this screw should be raised above the block
black screw: 1/10-1/16"
silver screw: 1/8"