Technical requirements for variable frequency power supply-EEWORLD

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Technical requirements for variable frequency power supply
1. Rated total capacity of variable frequency power supply: 6000VA,
input single-phase AC: 220V±10%, output three-phase four-wire symmetrical power supply (rated power of each phase 2000VA), the power supply is required to have the ability to be overloaded twice for a short time.
2. Insulation strength of variable frequency power supply: the withstand voltage between the output terminal and the shell and the ground should withstand 3000V AC power frequency for 1 minute without breakdown.
3. Output frequency
    1. There are three fixed frequency outputs: 40Hz, 50Hz, 60Hz; the frequency accuracy should be guaranteed to be ±0.05%.
4. The voltage of the variable frequency power supply is fixed to three gears, 250V and 1000V, and the two gears share the same output terminal.
1st gear: rated output 0~250V (referring to the single-phase output voltage when three-phase four-wire) and the output voltage is continuously adjustable, the output current is 8A~2A, and the output characteristics requirements are the same as above.
2nd gear: rated output 0~1000V (referring to single-phase output voltage in three-phase four-wire mode) and output voltage is continuously adjustable, output current is 2A~5mA; output characteristics are the same as above.
5. The power supply has short-circuit protection, overload protection, power device overheating protection, and overload alarm prompt when the maximum current is exceeded (prompting which phase voltage or current is overloaded).
6. Three-phase output characteristics of variable frequency power supply:
1 The output characteristics of the variable frequency power supply should not be affected by whether the power supply load is inductive or capacitive.
2 When the variable frequency power supply is output at non-industrial frequency, it is necessary to ensure that the external power supply load can normally output non-industrial frequency voltage and current signals when it reverses power to the output end of the power supply (reverse current is 50HZ/20A per phase).
3 The variable frequency power supply can output three-phase four-wire symmetrical power supply or single-phase power supply.
7. Variable frequency power supply structure requirements:
    integrated structure or split structure: the internal assembly of the power supply must ensure that each device has good anti-transport and vibration performance; the internal components of the power supply are assembled reasonably for easy maintenance; the power control key and the power input and output terminals are installed on the surface of the casing and recessed on the surface of the casing, the power frequency has a clear indicator light, and the bottom of the power supply uses large casters (integrated structure) with self-locking function for easy on-site movement; reasonable handling handles are installed on both sides of the power supply and recessed on the surface of the casing.
8. Harmonic content:
    0~250V: ≤3%
0~1000V: ≤3%
9. Output terminal and grounding terminal:
1. Voltage input terminal: U, N,
2. Voltage output terminal: UA, UB, UC, N,
3. Casing grounding terminal: GND
4. Frequency signal output terminal: frequency pulse (5V), ground (5V ground)

Reference address：Technical requirements for variable frequency power supply

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