High-voltage inverter startup precautions - Solutions - Huaqiang Electronic Network

High frequency probe high frequency line can be customized other specifications

1. The input 6kV power supply high voltage switch of the inverter must be turned on when the “high voltage closing permission” signal given by the inverter is required;
2. If the inverter never provides the “high voltage closing permission” signal, please confirm whether the inverter control power is closed, the cabinet door is closed, the bypass cabinet isolating switch is in place, the inverter itself is in a fault state, and Whether the system signal related to the inverter is correct;
3. After each 6kV high voltage switch is disconnected, it must be re-powered after at least 160 seconds;
4. When the bypass switch is in the variable frequency position, the user 6kV high-voltage switch is only equivalent to send power to the inverter, and the motor does not start. Need to start the motor, you must also send a running command to the inverter;
5. Before starting the inverter, the fan baffle or the pump outlet valve is preferably in the closed position. And confirm that the motor is not reversed due to the baffle or outlet valve is not strict and other reasons, otherwise it will easily cause over-current shutdown when the inverter starts;
6. When the inverter needs to be started, if the fan or water pump has just stopped, it should be confirmed that the fan or the pump has completely stopped, otherwise it will easily cause the unit to overvoltage when the inverter starts.
7.dcs can only send the start command to the inverter after the inverter is in the remote control state and get the “request run” signal of the inverter at the same time, and the inverter is started normally;
8. After the inverter starts, it will automatically accelerate the motor to the given speed of DCS. If the given speed of the DCS is less than the minimum speed setting, the inverter will run at the lowest speed.
9. After the DCS sends a start command to the inverter, if the given speed of the DCS and the minimum speed setting of the inverter are both 0, the motor will still not rotate. At this time, the DCS must set a reasonable speed setting value.
10. The motor is started by the inverter, and the impact on the motor, high-voltage switch, power grid and load system is very small. As long as the above conditions are met, there is no limit to the number of starts and the time interval.
11. In the case of power frequency bypass, to start the motor, switch the switch in the bypass cabinet to the power frequency mode, and then close the corresponding high voltage switch.