| 摘要 |
PROBLEM TO BE SOLVED: To provide stabilizing power supply to a load even when the voltage of a bus bar 13 suddenly changes at the time of switching the power supply. SOLUTION: This power supply system comprises a variable frequency power supply device 2 for supplying power received from the bus bar 13 to a motor (load) 3 with prescribed frequency, a phase control device 4 for detecting the phase of the received power and controlling the variable frequency power supply device 2, a bus bar current detecting device 27 for detecting the current flowing from a bus bar 23 to the bus bar 13 at the time of switching the power, a monitor device 6 for stopping control of the variable frequency power supply device 2 by the phase control device 4 when signals from the bus bar current detecting device 27 are at and more than a preset value, and a signal switching device 5 which interlocks with power supply switching to input the signals from the bus bar current detecting device 27 to the monitor device 6. It is thus possible to restrain abnormal power from being supplied to the motor 3 when the voltage of the bus bar 13 becomes variable at the time of switching the power and suddenly changes due to the connection of a second system power supply 20. |
