... Supply Specification:• Circuit Type: (IGBT) MPWM Pulse Duration Modulation• Input: 220V±10%, 50Hz/60Hz±5%• Output Voltage: 1) HIGH/LOW Adjustable2) Phase Voltage ... , 60Hz, adjustable between 45 and 70 Hz, 400Hz• Load Voltage Stabilization Rate: ≤ 0.5%• Frequency Stabilization Rate: 0 ... 0.001• Protective Devices: Over load, short circuit, over voltage, over current, over temperature protective ...