Inverter for operating motor during installation, has counter for counting control signals for microcomputer from moment in which protection circuit begins to operate, and converter circuit outputting number of clock signals

摘要

The inverter has a microcomputer (16) for controlling the inverter, where the microcomputer has a protection circuit (10) that stops the operation of the inverter in case of abnormality. A counter (11) is provided for counting the control signals for the microcomputer from the moment in which the protection circuit begins to operate. A converter circuit (12) is provided for outputting the number of clock signals counted by the counter. The number of clock signals is converted into numerical time value. A display (13) is provided for displaying the data.