... of Excitation: Brushless self-excitationProtection Class: IP23Vol. Control Method: AVR(Automatic Voltage Regulation)Voltage Regulation Rate: ±1%Vol. Harmonic ... 8 lagging for power frequency,1500/1800rpm,3-phase 4-wire or 1-phase 3-wire3) Engine model: 6126ZLD4) 4 ... load and over currentb) Operation displayi) Unit voltage,tri-phase load current and frequency displayii) Water temperature,oill pressure ...