Limit configurations are managed by two modest dials or screws on the motor device, commonly labeled “Up” trolley need to end within the completely open up place at minimal one inch from the halt bolt about the opener rail. The Chamberlain Whisper Drive comes along with a one/2 horsepower motor, https://youtu.be/wSkWTAdm-Gg?si=pR5EXdjVuNYjtHN7