Electrical Feature: 1. Wholly digital design, strong in anti-interference, no temperature shift when in continuous working; 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. Multi-protection functions (for over current, over voltage, insufficient water pressure, power failure, or phase absence), and mishandling will not cause damage to machine.