| 摘要 |
The present invention relates to a voltage sag protector for a 3-phase servo driver, which installs a power cutoff switch (hereinafter, a first power cutoff switch) at one among an R-phase power line, an S-phase power line and a T-phase power line connecting an external power source side, where a 3-phase alternating current power source is inputted, to a 3-phase servo driver side; installs a power cutoff switch (hereinafter, a second power cutoff switch) of a voltage sag protector for a single phase on one between the remaining two power lines, where the first power cutoff switch is not installed, independently of the first power cutoff switch; and if a voltage sag occurs due to a short circuit accident, a stroke of lightening, etc. on a power system, turns off the first and the second power cutoff switch, blocks electric connection to the external power source side, where the 3-phase alternating current power source is inputted, and the 3-phase servo driver side and concurrently provides a single phase alternating power source of the voltage sag protector for the single phase reserved for the voltage sag for the 3-phase servo driver, thereby making a corresponding 3-phase servo driver convert an inputted single phase alternating current power source into other 3-phase alternating power source needed for a load side and output the converted power source. According to the present invention, the voltage sag protector for the 3-phase servo driver can be easily manufactured at low costs by using the voltage sag protector for the single phase which solves shortcomings and problems of a traditional uninterruptible power supply (UPS). |
