Variable Frequency Starter (VFS) can realize the step frequency conversion and stepless voltage regulation through the control to the thyrister.
It can output 12.5 Hz, 25Hz and 50Hz frequencies, and through controlling the voltage/ frequency ratio to realize small starting current and big starting torque characteristics. At the same time, it can realize voltage slope starting, constant current starting, soft stop, brake stop and other start/stop controlling method. This technology is newly developed, and become one of the best motor starting technologies in the world.
VFS could be used in driving blower, pump, compressor and soft stop& start of HV three-phase AC asynchronous motor or synchronous motor. Also it could be used on some fixed frequency conversion condition, which could save the energy.
Technical Parameters:
Item
Performance index
Range of power to be applied for
160kW-50000kW
Rated voltage
2.3-13.8kV
Voltage drop of thyrister
Less than 1V with bypass
Triggering technology
electromagnetic triggering or Photo-electric triggering
Starting torque
80%-90% rated torque
Starting current
Controllable and can be less than 2 times
Protection & monitoring
With over current protection, starting overtime protection, valves triggering failure protection etc.
Stop mode
Free stop mode, soft stop mode and electric braking mode
Directions
Forward & Reverse
Communication
Modbus, Profibus RS485, CAN
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