| 摘要 |
PROBLEM TO BE SOLVED: To provide a controller which informs the user of leakage. SOLUTION: To solve the above problem, this controller is equipped with a servo motor driver 2 which generates a three-phase AC current so as to drive a servo motor 23, a detector 9 which detects the sum of the currents Iu, Iv, and Iw 6-8 flowing to each phase of the three-phase AC, a detecting storage 15 which outputs a signal when the absolute value of the sum of the currents Iu, Iv, and Iw 6-8 is larger than a preset reference value, an oscillator 16 which outputs a signal being oscillated by the input of the output signal of the detecting storage 15, an annunciator 50 which issues either light or sound by the above oscillation signal, and a battery 55 which enables the detecting storage 15, the oscillator 16, and the annunciator described above to operate when the R phase, S phase, and T phase 1 of the three-phase AC power source are broken. COPYRIGHT: (C)2004,JPO
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