2. Good magnetic isolation, safe and reliable; 
3. Solid frequency conversion power supply, easy operation; Adjustable power rate, easy operation and maintenance; 
4. Easy to start up with load or free of load.

Electrical Feature: 
1. Digital CMOS chip (U. S. ASIC-2-12), with the highest degree of integration at home, is used in control circuit, the overall machine controlled through one single panel; 
2. Frequency-sweep zero voltage start, high success rate, no shock;
3. Automatic resistance adjustment, permanent power output, 10-20% energy saved in comparison with domestic traditional machine of the type; 
4. Auto phase sequence adaptation, free of synchronization; 
5. Good performance in reload staring, auto recovery; 
6. Highly integrated in controlling circuit, free of use of high-rate starter and relay loop, fairly low failure rate; 
7. Wholly digital design, strong in anti-interference, no temperature shift when in continuous working; 
8. Multi-protection functions (for over current, over voltage, insufficient water pressure, power failure, or phase absence), and mishandling will not cause damage to machine.