Patent ID: 6867682
Filing Date: 2005-03-15
Classification: F24F,G05B

Abstract:
1. A clean room comprising: filter-fan units each having at least one fan motor and being connected to an electric network; each one of said filter-fan units having a specific address; at least one central control unit: a LON network comprising a connecting bus system; a connecting node for each one of said filter-fan units, wherein each one of said filter-fan units is connected to said bus system by one of said connecting nodes; said bus system connecting said filter-fan units to one another and to said at least one control unit; wherein said filter-fan units are directly accessed via sold specific address by said at least one central control unit; wherein said fan motors are electronically commutated direct current motors; wherein each of said connecting nodes has a microcontroller and comprises a motor control of the at least one fan motor of the filter-fan unit; wherein said at least one central control unit prescribes desired or rated data that is transmitted to said filter-fan units, wherein monitoring of the desired or rated data is effected by said microcontrollers, which, when a disruption occurs, transmit an error message to said at least one central control unit; wherein said LON network is configured such that a communication from said filter-fan units to said at least one control unit is enabled; wherein noise produced by said filter fan units is reduced by electronic commutation of said electronically commutated direct current motors at a pulse-width modulated frequency of approximately 20 kHz.