| 摘要 |
PURPOSE:To make an adjusting work for removing the fixed error of an analog input part unnecessary and to contrive to reduce a cost by relaxing the accuracy of parts. CONSTITUTION:In the digital relay, an AC input quantity taken in via analog input part 101 is converted into a digital signal by A/D converter 20, the value of the AC input quantity is operated by a relay operation part 30, and a protective operation is performed by the comparison of an operated value with a set point. The input quantity operated value by the relay operation part 30 at the time of tentatively applying an input corresponding to the set point to the analog input part 101 is stored beforehand in a set-point table 50. At the time of actually using the relay, the input quantity operated value in the set-point table 50 is set as the set point and used for the comparison with the input quantity operated value at the time of using the relay. |
