Patent ID: 8480136

Claim:
An exit device for locking and unlocking a door, the exit device comprising: a housing adapted to be fixedly coupled to the door, a locking mechanism at least partially enclosed by the housing for locking and unlocking the door, the locking mechanism including a link movable between locked and unlocked positions and a latch bolt connected to the link and operable between an extended state and a retracted state; a motor for moving a motor shaft connected to the link; and a microcontroller for operating the motor, wherein the microcontroller includes instructions for operating the motor to move the link in a first direction toward the unlocked position, the motor being operated until the link reaches a hard stop position; thereafter determining a soft stop position based on the hard stop position; and thereafter selectively using the motor to move the link in the first direction toward the unlocked position, the motor being operated only until the link reaches the soft stop position.