Method of controlling a motorized window treatment

An electronic drive unit for controlling a motorized window treatment comprising:

• a motor coupled to the motorized window treatment for moving the motorized window treatment;
• a rotational position sensor coupled to the motor;
• a motor drive circuit coupled to the motor;
• a controller coupled to the motor drive circuit operable to drive the motor drive circuit so as to control the rotation of the motor to control the motorized window treatment in response to a command, the controller coupled to the rotational position sensor and operable to determine a rotational position of the motor;
• a memory coupled to the controller, such that the controller is operable to store the command in the memory, the controller further operable to store a present position of the motorized window treatment in the memory in response to determining that the rotational position of the motor has changed by a predetermined angle;
• wherein the controller is operable to recall the command and the present position from the memory after the controller is reset, and to drive the motor drive circuit in response to the command and the present position recalled from the memory.

A method of controlling a motorized window treatment through an overload condition in which a motor of the motorized window treatment draws substantially large amount of current of transitory duration, the method comprising the steps of:

• saving a desired position and a present position of the motorized window treatment prior to the overload condition;
• allowing a controller of the motorized window treatment to reset during the overload condition;
• recalling the desired position and the present position after the overload condition;
• and
• driving the motor of the motorized window treatment in response to the desired position and the present position.

A method of controlling a motorized window treatment to a desired position, the motorized window treatment driven by an electronic drive unit having a motor, a controller, and a memory, the controller operable to determine the rotational position of the motor, the method comprising the steps of:

• storing the desired position in the memory;
• storing a present position of the motorized window treatment in the memory when the rotational position of the motor has changed by a predetermined angle;
• recalling the desired position and the present position from the memory when the controller is reset;
• and
• driving the motor in response to the desired position and the present position recalled from the memory.