... patents 1>Double frequency induction heating machine XS-80 technique data:1. type:XS-180-120B2. input voltage:three phase 380V3. input power ... itself, such as over-voltage, over current, lack of water, phase fail, over hot, etc. 8.Digital auto-control, it has ... itself. such as, over-voltage, over-current,lack of water, phase fail,etc.3)auto frequency tracking, the power can be ...