When selecting the inverter of the Roots blower, it should be selected according to the constant torque load. For the 45kW Roots blower, the rated current of the motor is 84.5A, and the ACS604-0100-375kW inverter is used. Under normal load conditions, the power of the motor is 7500kW. Under heavy load, the power can reach 55kW in 10 minutes. In the cycle, the output current can reach 168A in one minute, which is twice the output current of the motor. In the 15-second period, the output current can reach 224A in 2 seconds, which is 2.65 times of the rated current of the motor, which can meet the requirements of instantaneous overload.
According to different typical industrial objects, many different kinds of application macros are designed. The so-called application macros are pre-programmed parameter sets. The application macro can be used to quickly and easily start the AC600. The application macro reduces the number of parameters that need to be set during the startup process. All parameters have default values ​​set at the factory. Therefore, the user must determine which to use before debugging the inverter. An application macro, the macro can be checked, defined, selected and adjusted at the prompt of the menu once selected by the user. Since the menu has English prompts, the physical meaning of each parameter is intuitive and clear, and the user can conveniently select .
The routine parameters to be determined during commissioning are start/stop/direction signal, relay output signal, analog I/O signal and range calibration, acceleration/deceleration time, motor stall protection, overload protection, soft limit of various power operation, Various faults, alarm conditions, etc. In addition, there are 2 important parameters to choose from:
First, the start-up function should be selected. It can make the inverter system smoothly pass the power supply instantaneous low voltage or even instantaneous power loss, and self-start after the power supply voltage returns to normal. This is necessary for such important load of gas supply;
Second, the inverter DC bus over-voltage automatic control and under-voltage automatic control are set to use, so that the regenerative current can be automatically limited when the motor is quickly braking, so that the DC bus overvoltage is not caused, and the motor can be automatically turned on when the power supply is low. Entering the state of regenerative power generation to ensure that the DC bus voltage is not lower than the voltage low limit, this automatic control of the bus voltage is extremely important for protecting the normal operation of the frequency conversion system and reducing alarm and parking faults.
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