Precautions for Selecting a Frequency Converter for Anti-Corrosion Roots Blowers
Release date:
2022-08-04
Precautions for Selecting a Variable-Frequency Drive for Corrosion-Resistant Roots Blowers Matching a variable-frequency drive (VFD) with a corrosion-resistant Roots blower is an important method for many manufacturers to achieve energy savings. Even some conventional power-frequency equipment can be retrofitted with VFDs later on to operate more efficiently. All corrosion-resistant Roots blower products can be equipped with VFD control. For equipment requiring VFD retrofitting, this article summarizes several key points for your consideration when selecting a VFD.
Precautions for Selecting a Frequency Converter for Anti-corrosion Roots Blowers
Anti-corrosion Roots blower Matching inverters are an important means for many manufacturers to achieve energy savings. Some conventional power-frequency equipment can also be retrofitted with frequency converters to operate more efficiently. All corrosion-resistant Roots blowers can be equipped with inverter control. For equipment requiring retrofitting with frequency converters, this article summarizes several points for your consideration when selecting an inverter:
1. Select a variable-frequency drive (VFD) based on the load characteristics. Since there are numerous types of production machinery with varying performance and process requirements, their torque characteristics also differ. Therefore, before applying a VFD, it is essential to first understand the nature of the load driven by the motor—i.e., the load characteristics—and then choose the appropriate VFD accordingly.
There are three types of loads: constant-torque loads, square-torque loads, and constant-power loads. Different types of loads should be matched with different types of inverters.
2. When selecting a variable-frequency drive (VFD), the actual motor current value should be used as the basis for VFD selection; the motor’s rated power should serve only as a reference. Additionally, it is crucial to fully consider that the output of the inverter contains high harmonic content, which can degrade the motor’s power factor and efficiency. Therefore, when selecting both the motor and the VFD, an appropriate margin should be allowed to prevent excessive temperature rise from shortening the motor’s service life.
3. If the inverter is operated using long cables, measures should be taken to mitigate the impact of the long cables on the coupling capacitance, thereby preventing insufficient inverter output. Therefore, the frequency converter should be selected one step higher, or an output reactor should be installed at the output end of the frequency converter.
4. When using a variable-frequency drive (VFD) to control multiple motors connected in parallel, the total length of cables from the VFD to each motor must be within the VFD’s allowable range. If the total cable length exceeds the specified limit, select a VFD model that is one or two ratings higher. Additionally, in this scenario, the VFD can only employ V/F control mode; the VFD itself cannot provide protection against motor overcurrent or overload. Therefore, it becomes necessary to install a fuse for each motor to ensure adequate protection.
5. For certain special application scenarios—such as high ambient temperatures, high switching frequencies, and high altitudes—this can lead to a reduction in the inverter’s capacity, requiring the inverter to be upgraded by one rating level.
6. When using a variable-frequency drive to control a high-speed motor, since the high-speed motor has low reactance, higher-order harmonics also increase the output current. Therefore, when selecting a variable-frequency drive for a high-speed motor, the drive rating should be slightly larger than that required for a standard motor.
7. When using a variable-frequency drive with a pole-changing motor, it is essential to carefully select a VFD with a capacity such that its maximum rated current is lower than the VFD’s rated output current. Additionally, when switching between pole numbers during operation, the motor must be stopped first; otherwise, the motor may run idle, which could damage the inverter.
8. The motor driving the explosion-proof motor is not equipped with an explosion-proof structure for the frequency converter; therefore, the frequency converter should be installed in a hazardous area.
About Anti-corrosion Roots blower That’s all for today’s explanation. Thanks for watching! If you’re looking to purchase corrosion-resistant Roots blowers, feel free to contact the editor.
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