ke a loop frequency converter system.Operating is easy,st-arting without inpulse(soft staring),so the source
capacity could be greatly becreased,power factor is constant(cos1).It has fail-ure indicating and toher
protecting functions.
Because the key part of the frequency converter is a monolithic micro-computer,it works erriciently:
Protection of overcurrent,short-circuit,overvoitage,undervod-tage,instant power-off and phase.
Display of frequency speed and load with digitalorpointer.
Des