First: It is not suitable to power on directly
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It is necessary to open the inverter cover and check whether the internal line is oxidized.
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Did you get chewed up by rats?
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Is the interior damp?
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If none of these problems exist, move on to the next step.
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If there is, take care of it.
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Second: power precautions
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It is recommended to use 220V power supply first to age, and let the capacitor charge and discharge.
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If anything goes wrong, power goes out immediately.
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Normal aging for half an hour first, and then connect the 380V power supply.
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Third: preparation before operation
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After normal power-on, it is not recommended to run DC. Use a multimeter in DC mode and PN successively test whether there is too much leakage in UVW.
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If there is too much difference in the drive alone, there may be problems, and direct operation may puncture the lGBT module.
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The above confirms normal operation, and the motor can be put into use after aging for a period of time after measuring the three-phase balance.
A: The inverter charging method steps are as follows: First of all, if it is an additional pre-charging circuit, the power module of the inverter itself needs to be disconnected from the DC bus when charging. Single-phase or three-phase inverters can be charged with a single-phase voltage regulator (L to L1, N to L2 or L3). Since it is the same rectifier, all DC bus capacitors will be charged simultaneously.
1, the low power inverter usually adopts the rectification and pre-charging mode, and the bypass contactor is closed after the pre-charging is completed. 2, high-power inverter, pre-charging circuit using a separate diode circuit as pre-charging.
The inverter does not need to be charged because the inverter is not an electronic device such as a mobile phone, which requires a battery to charge.
Inverter is a kind of equipment to adjust the current and frequency, the principle is to change the speed of the motor by adjusting the current waveform.
Therefore, the inverter needs to be directly connected to the power supply and adjust the motor through an external line without any charging.
Therefore, users do not have to worry about the charging of the inverter, only need to correctly connect the line and make appropriate adjustments.
If it is a pre-charging circuit, it is necessary to disconnect the power module of the inverter itself from the DC bus when charging. If you look at your DC bus, there are several fast fuses that can be drawn out, just pull these fast fuses out.
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In addition to the pre-charge circuit, the pre-charge rectifier can be charged by passing the current limiting resistor and then connecting it to the DC bus.
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If a controlled rectifier is used to pre-charge it, the specific steps are as follows - the rectifier unit must be in operation.