Technical requirements for variable frequency power supply 1. The rated total capacity of variable frequency power supply: 6000VA
Input single-phase AC: 220V±10%, output three-phase four-wire symmetrical power supply (2000VA rated power per phase), requiring the power supply to have a short-time overload capacity of 2 times.
Second, the variable frequency power supply insulation strength: the output end and the outer casing and the ground withstand voltage should withstand the power frequency exchange 3000V, lasting 1 minute without breakdown.
Third, the output frequency 1, fixed three-speed fixed-frequency output: 40Hz, 50Hz, 60Hz; frequency accuracy should be guaranteed ± 0.05%.
Fourth, the variable frequency power supply voltage is fixed to three gear positions, 250V and 1000V, and the second gear shares the same output terminal.
1st gear: rated output 0~250V (refers to 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 are the same as above.
2nd gear: rated output 0~1000V (refers to single-phase output voltage when three-phase four-wire) and the output voltage is continuously adjustable, the output current is 2A~5mA; the output characteristics are the same as above.
5. The power supply has short-circuit protection, overload protection, and power device overheat protection. The overload current alarm is indicated when the maximum current is exceeded (it indicates that the phase voltage or current overload protection).
Sixth, three-phase output characteristics of variable frequency power supply:
1 The output characteristics of the variable frequency power supply should not be affected by the inductive or capacitive load of the power supply.
2 When the variable frequency power supply is output at the non-power frequency, ensure that the external power supply load reverses the power supply output (the reverse current is 50HZ/20A per phase), and the voltage and current signals of the non-power frequency can be output normally.
3 The variable frequency power supply can output three-phase four-wire symmetrical power supply, and can also output single-phase power.
Seven, variable frequency power supply structure requirements:
One-piece structure or split-unit structure: It is required that the internal assembly of the power supply must ensure that each device is resistant to transportation and vibration. The internal components of the power supply are properly assembled and easy to maintain; the power control keys and power input and output terminals are installed on the surface of the casing. Concave on the surface of the casing, the power frequency has a clear indicator light. The bottom of the power supply uses a large caster (one-piece structure) with a self-locking function to facilitate on-site movement; a reasonable handling handle is installed on both sides of the power supply, and is recessed on the surface of the casing.
Eight, harmonic content:
0 to 250V: ≤3%
0 to 1000V: ≤3%
9. Output and ground:
1. Voltage input: U, N,
2. Voltage output: UA, UB, UC, N,
3. Chassis ground: GND
4. Frequency signal output: frequency pulse (5V), ground (5V ground)
Input single-phase AC: 220V±10%, output three-phase four-wire symmetrical power supply (2000VA rated power per phase), requiring the power supply to have a short-time overload capacity of 2 times.
Second, the variable frequency power supply insulation strength: the output end and the outer casing and the ground withstand voltage should withstand the power frequency exchange 3000V, lasting 1 minute without breakdown.
Third, the output frequency 1, fixed three-speed fixed-frequency output: 40Hz, 50Hz, 60Hz; frequency accuracy should be guaranteed ± 0.05%.
Fourth, the variable frequency power supply voltage is fixed to three gear positions, 250V and 1000V, and the second gear shares the same output terminal.
1st gear: rated output 0~250V (refers to 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 are the same as above.
2nd gear: rated output 0~1000V (refers to single-phase output voltage when three-phase four-wire) and the output voltage is continuously adjustable, the output current is 2A~5mA; the output characteristics are the same as above.
5. The power supply has short-circuit protection, overload protection, and power device overheat protection. The overload current alarm is indicated when the maximum current is exceeded (it indicates that the phase voltage or current overload protection).
Sixth, three-phase output characteristics of variable frequency power supply:
1 The output characteristics of the variable frequency power supply should not be affected by the inductive or capacitive load of the power supply.
2 When the variable frequency power supply is output at the non-power frequency, ensure that the external power supply load reverses the power supply output (the reverse current is 50HZ/20A per phase), and the voltage and current signals of the non-power frequency can be output normally.
3 The variable frequency power supply can output three-phase four-wire symmetrical power supply, and can also output single-phase power.
Seven, variable frequency power supply structure requirements:
One-piece structure or split-unit structure: It is required that the internal assembly of the power supply must ensure that each device is resistant to transportation and vibration. The internal components of the power supply are properly assembled and easy to maintain; the power control keys and power input and output terminals are installed on the surface of the casing. Concave on the surface of the casing, the power frequency has a clear indicator light. The bottom of the power supply uses a large caster (one-piece structure) with a self-locking function to facilitate on-site movement; a reasonable handling handle is installed on both sides of the power supply, and is recessed on the surface of the casing.
Eight, harmonic content:
0 to 250V: ≤3%
0 to 1000V: ≤3%
9. Output and ground:
1. Voltage input: U, N,
2. Voltage output: UA, UB, UC, N,
3. Chassis ground: GND
4. Frequency signal output: frequency pulse (5V), ground (5V ground)
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