Variable frequency power source operating system

Details Variable frequency power source operating system Variable frequency power source operating system

H - Electricity

02

J

318/120

H02J 9/06 (2006.01)

Patent

CA 1261390

ABSTRACT OF THE DISCLOSURE The output frequency of a variable frequency power source for driving a motor which drives a rotary body such as a fan in a variable-speed control mode is fixed, when abnormality in a control signal supplied to the variable frequency power source from outside to determine the output frequency of the variable frequency power source is detected, at the output frequency of the variable frequency power source immediately before the detection of abnormality in the control signal, and thereby the abnormal variation of the revolving rate of the motor resulting from the abnormality in the control signal is avoided. - 18 -

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