... Protection Operation Panel Optional Parts Optional Parts The controller feature: 1)Low inertia, high speed, medium torque servo motor, precise ... , Back tacking presser foot lift control. 4)Needle Position Accuracy±1.5°. 5)Thread trimming, thread wiping, back tacking, presser ... for motor is flexible, as is shown in figures 1. 9)Switching mode power supply enables wider range of applicable voltage ...