On-load debugging method for inverters - Solutions - Huaqiang

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Photocoupler

The on-load debugging of the frequency conversion system is mainly to observe the working condition of the motor after the load is loaded, including:
1) Start test to gradually increase the operating frequency from 0HZ, observe whether the motor can start, and start at a large frequency. If starting is difficult, try to increase the starting torque, such as increasing the U/F ratio. If it is still difficult to start, consider increasing the inverter capacity or using vector control.
2) Acceleration test According to the load requirement, set the acceleration time to the shortest value, adjust the given signal to the maximum, press the start button to observe the change of the starting current, and whether the starting process is stable.
If a stall occurs, to prevent the overcurrent alarm signal, or the starting current is too large to trip, the extension time should be appropriately extended within the range allowed by the load, or the speed profile should be changed.
3) Deceleration test Adjust the running frequency to the highest working frequency, press the stop button to observe the system shutdown process.
If a stall occurs, in order to prevent the over-current alarm signal, or over-current, over-voltage trip, the deceleration time should be extended or the regenerative energy braking resistor should be selected. The minimum speed reduction time will vary depending on whether the inverter contains a regenerative energy braking resistor.
When the output frequency is 0HZ, if the drag system has a creep phenomenon, DC braking should be set or strengthened.
4) Continuous operation test When the load reaches the maximum, adjust the operating frequency to the highest frequency and observe the change of the inverter output current. If the output current often exceeds the rated current of the frequency converter, consider reducing the maximum operating frequency or reducing the load.
5) Motor heating test When the load is full, the operating frequency is adjusted to the lowest operating frequency, and the low-speed continuous operation is performed according to the continuous running time required by the load to observe the heating of the motor.
6) Overload test Test according to the overload condition and continuous running time that may occur in the load, and observe whether the drag system can continue to work.