Notes on starting the inverter

In the inverter start-up delay circuit, most of the thyristor (SCR) circuits are used. When it is not conductive or has poor performance, it can cause the delay resistor to burn out. The next thing for everyone to understand is the knowledge of the precautions for startup. I hope you will read it carefully.
  1. The input 6kV power high-voltage switch of the equipment can only be closed after the "high-voltage closing permit" signal from the inverter;
2. If the inverter does not always provide the "high voltage closing permission" signal, please confirm whether its control power supply is closed, the cabinet door is closed, whether the bypass cabinet isolation switch is in place, whether it is in a fault state, and whether it is related to the equipment Is the system signal correct;
  3. Every time the 6kV high voltage switch is disconnected, it must be at least 160 seconds before the power can be sent again;
  4. When the isolation switch of the bypass cabinet is in the variable frequency position, the closing of the user's 6kV high voltage switch is only equivalent to powering the inverter, and the motor does not start. It is necessary to start the motor, and it is necessary to send a running command to the equipment;
  5. Before starting, the fan baffle or the water pump outlet valve should be in the closed position. And confirm that the motor is not reversed due to weak baffle or outlet valve and other reasons, otherwise it will easily cause over-current shutdown when the equipment is started;
  6. When the inverter needs to be started, if the fan or water pump has just stopped shortly, it should be confirmed that the fan or water pump has completely stopped, otherwise it will easily cause the unit overvoltage when the equipment is started;
  7, DCS can only send a start command to the device and start the inverter normally after the device is in the remote control state and the "request to run" signal is obtained at the same time;
  8. After starting, the motor will automatically accelerate to the DCS set speed. If the DCS given speed at that time is less than the minimum speed setting value, it will run at the minimum speed.
After   DCS sends a start command to the inverter, if the given speed of the DCS and the minimum speed setting value of the device at that time are both 0, the motor will still not rotate. At this time, the DCS must set a reasonable speed setting value.