| 摘要 |
An operable fenestration operating system for a structure including a window or skylight having a frame, an operable sash and presenting a resistance force opposing opening and closing of the sash. A motorized operator is coupled with the frame and the sash to selectively open and close the sash. The invention includes an operator control unit communicatively connected to the motorized operator. The operator control unit includes a processor, a sensor for sensing the magnitude of the resistance force, a pulse width modulation circuit for supplying electrical power to the motorized operator. The processor varies the torque output of the motorized operator using the pulse width modulation circuit in response to the sensed parameter.
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