| 摘要 |
PURPOSE:To effect accident preventing operation in an early period even in a device, in which the reduction of an output is connected to the accident, by a method wherein an abnormality alarm is outputted when an actual current becomes lower than the lowest current setting, effected by the output of a function generator. CONSTITUTION:The value of lowest current setting, outputted from a function generator 11, is the function of a frequency reference 6 and the opening degree 18 of a damper. An actual current from a current detector 12 is compared with the output of the function generator 11 by a comparator 13 and when the actual current is lower than the lowest current setting effected by the output of the function generator, an alarm is outputted from an alarm outputting device 14. According to this method, an abnormal output reduction may be detected in an early period and accident preventing operation may be effected in the early period even in a device, in which the reduction of the output is connected to the accident thereof. |
