W cannot be connected wrongly. The input terminals R, S, and T of the variable-frequency power supply are connected to the input terminals of the three-phase rectifier bridge, and the output terminals U, V, and W are the transistor inverter circuits connected to the three-phase asynchronous motor.
If the two are connected wrongly, the frequency conversion speed regulation cannot be realized at light, and the motor will not run, and the frequency conversion power supply will be burned if it is heavy. 5. The terminal ‘N’ of the variable frequency power supply is the low-level end of the intermediate DC loop. It is strictly forbidden to connect to the neutral line or earth in the three-phase four-wire power supply line, otherwise it will cause the three-phase rectifier bridge to damage the variable frequency power supply due to the short circuit of the power supply. . 6.
If there is a variable frequency power supply with a built-in braking unit and an external braking resistor, it is necessary to pay attention to the correct wiring of the braking resistor. The braking resistor must be connected between P and DB, not between P and N, otherwise it will cause the inverter of the inverter power supply to work at full load when the three-phase rectifier bridge is not running, resulting in the inverter power supply not working properly.
The dynamic home elevators manufacturers may also burn out. 7. Electromagnetic contactors cannot be installed on the output side of the frequency conversion power supply. If it must be installed, the following conditions must be met: If the frequency conversion power supply is running, it is strictly prohibited to switch the electromagnetic contactor on the output side; to switch the contactor must wait until the frequency conversion power supply Only after stopping the output.
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