| 摘要 |
A cooling system incorporates a semiconductor IC device having an abnormality detector for detecting the occurrence of an abnormal condition by receiving clock signals and more or less periodically outputted signals from a system being monitored. An AND gate receives the clock signals and generates sequentially increasing count signals. During a normal operation of the system, another AND gate receives the signals from the system being monitored. These signals serve to initialize the clock count signals. These signals are received under a normal condition of operation such that the count signal is initialized before reaching a specified value. An abnormality-indicating signal is outputted when the clock count number reaches the specified value. The AND gates are so connected that the first AND gate serves to prohibit input of clock signals, the second AND gate serves to stop initialization of the count signal when an abnormality indicating signal is received. The mode of operation of the system may be changed so as to reduce the rate of heat production when an abnormal condition is detected.
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