变频-工频切换
switching between variable frequency and industrial frequency
变频-工频同步切换
VF-FF synchronous switching
自动工频旁路
Auto power frequency bypass
变频驱动
inverter driver
variable-frequency drive
frequency conversion driving
frequency-conversion driving
frequency conversion actuation
frequency Drive
variable frequency drive
variable frequency drives
variable voltage variable frequency VVVF control
campus dining place
Inverter-fed
变频驱动系统
variable frequency drive system
frequency conversion system
交流变频驱动
AC frequency-converter driver