1. Alarm Indicator: The alarm indicator light indicates different protective states. 2. Emergency Stop Button: Used for urgent stop of the variable frequency power supply. 3. Start/Reset Button: Used to start the variable frequency power supply, or to restart after the power supply has been protected due to an issue, following troubleshooting of the protective fault. 4. Frequency Fine-Tuning Knob: Used for fine-tuning the frequency when adjustable frequency ranges are available. 5. Frequency Selection Switch: Switch for selecting between adjustable and fixed frequencies of 50Hz/60Hz. 6. High/Low Output Voltage Conversion Button: Converts between 0~260V and 0~520V for output voltage. 7. Standard Voltage Output Fine-Tuning Knob: A 10-turn locking fine-tuning switch that allows for adjustment to obtain the desired standard voltage. 8. Comprehensive Electric Meter: Displays parameters such as output frequency, voltage, current, power, and power factor of the variable frequency power supply. Aircraft Ground Power 2, 36V Aircraft Power 1, 400Hz Variable Frequency Power Supply 7, 115/200V Power Supply 2, 27V DC Power Supply 5, 400Hz Power Supply 12, Aircraft Power
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