| 摘要 |
PROBLEM TO BE SOLVED: To permit parallel layout of respective braking apparatuses, by outputting a conductive command to a self switching element under the logical SUM condition of the braking start signal of the Nth braking apparatus and the braking start signal of the first braking apparatus. SOLUTION: When two braking apparatuses are used, a parallel signal generator 1-4 is inserted between a setting comparator 1-2 and a switching element 1-3, and a parallel signal generator 2-4 is inserted between a setting comparator 2-2 and a switching element 2-3, to give the Br1 signal in the braking apparatus 1 side to the parallel signal generator 2-4 and the Br2 signal in the braking apparatus 2 side to the parallel signal generator 1-4. Moreover, when a DC voltage Vdc of a DC voltage circuit 6 of the inverter apparatus 4 exceeds the braking set level Vb1, since the braking start signal Br1 is given both to the parallel signal generators 1-4 and 2-4, these circuits output the commands Dr1, Dr2 to make conductive the switching element. As a result, the switching elements 1-3, 2-3 become conductive. Accordingly, parallel layout of the braking apparatuses may be realized. |
