摘要:
An improved variable speed fan controller for use in devices such as laser printers. The controller automatically adjusts its output signal to fans such that a fan quickly settles into an appropriate operating speed, even if the fan has been newly installed into the equipment. The controller can store values in non-volatile memory, if desired, to keep track of recent changes in the fan's operating parameters and corresponding control signal values. The controller is able to control relatively inexpensive fans that don't necessarily operate at a predictable fan rotating speed under repeatable conditions and control signals, by controlling the fan to an initial or predetermined rotating speed; if the fan isn't running within a suitable range of rotational speeds, then determining whether a fine or coarse adjustment should be made to the fan's rotational speed. The controller makes appropriate adjustments until the fan's rotational speed is within acceptable operating tolerances.
摘要:
A contractor certification system employs a survey with targeted questions and interviews, and job site visits, to objectively analyze business and financial practices of a contractor and assess risks involving the contractor's business. A report provided by the contractor certification system to the surety institutions and to the contractor details the business and financial practices, together with the risks, and ranks the contractor's operation in comparison with industry recognized standards. A database maintained by the contractor certification system contains a compilation of business and financial practices and risk factors derived from previously evaluated contractors, together with their performance histories germane to meeting time objectives and project cost goals. A logo generated by the system graphically depicts the contractor's rank. The logo can be used by the contractor in correspondence with prospective customers.