| 摘要 |
PURPOSE:To check the change or error of rotational frequency of a compressor lower and consequently check the feeling of physical disorder to noise and vibration lower by a method wherein the differences between room temperatures and set temperature values and the pre-set threshold values are compared with each other at predetermined time intervals and a plurality of stages of digital signals or frequency setting signals are successively sent to a frequency conversion device. CONSTITUTION:The input of a room temperature sensor 9 and the input of a temperature setter 10 are compared at comparators 18 with the reference voltages corresponding to digital data sent from a memory 14, in which a pre-set program is received, through a central operation and processing unit 15 to a data latch 16 after being converted by means of a D/A converter 17. Data (b) corresponding to the room temperature values and data (c) corresponding to the set temperature velues are obtained by repeating the same procedure with changed digital data. Values of temperature differences are obtained by performing the logical operation in the difference values between the data (b) and data (c). Next, the data corresponding to pre- set threshold values are taken out of the memory 14 and compared at the central operation and processing unit 15 with the values of temperature differences at predetermined timer intervals. As a result, the digital data corresponding to frequencies are sent through a data latch 19 to a frequency conversion device 3. |
