| 摘要 |
PURPOSE:To indicate misconnection by the output of either overvoltage detection circuit by providing power source terminals with overvoltage detection circuits, which detect the level of the voltage applied to both power source terminals, and connecting the output sides of both overvoltage detection circuits in parallel. CONSTITUTION:The output sides of both overvoltage detection circuits 6 and 7 are connected in parallel, and the junction is connected to the light emitting diode side of a photocoupler PT, thus it becomes the constitution that the photocoupler is only one, and that the input of CPU 8 for abnormality detection also is one. Hereupon, since it is either low voltage side or high voltage side that the user connects power, by outputting whether the application voltage to the connected point is proper or excessive, a misconnection indicator 9 consisting of an indication element such as a light emitting diode, etc., indicates misconnection or misapplication through CPU 8. Hereby, misconnection can be indicated by the output of either overvoltage detection circuit. |
