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Retrofitted VSD or Integrated VSD? There's a clear winner.

Variable Speed Drive (VSD) technology has revolutionized the way we manage energy consumption in various industrial applications. When it comes to implementing VSD technology, businesses often face a choice between retrofitting existing systems with VSD components or investing in integrated VSD compressors. Both approaches have their unique advantages and benefits and understanding these can help make an informed decision.

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Retrofitted VSD

Advantages

1. Low cost initial investment

Retrofitting an existing fixed-speed compressor with a VSD component can be less expensive initially compared to purchasing a new integrated VSD compressor. This makes it an attractive option for businesses looking to upgrade their systems without a significant upfront cost.

2. Flexibility

Retrofitted VSD systems offer flexibility as they can be added to existing compressors. This allows businesses to enhance their current equipment without the need for complete overhaul.

Disadvantages

1. Compatibility issues

Retrofitting a VSD to an existing compressor may lead to compatibility issues. The existing motor and other components might not be designed to handle variable speeds, which can result in reduced efficiency and potential mechanical failures. 

2. Harmonic distortions

VSD converters employ high-speed switching, which can generate harmonic distortions in the AC sine wave. These distortions can cause eddy currents and heat, reducing the efficiency of the motor and potentially affecting other electrical machines in the facility. 

3. Structural resonance

Retrofitted VSD systems can introduce structural resonance issues, leading to excessive vibration levels that are harmful to equipment and the environment. This is because the excitation frequencies become variable, increasing the likelihood of encountering resonance conditions.

4. Higher maintenance costs

Since retrofitted systems are not optimized for variable speeds, they may require more frequent maintenance and adjustments compared to integrated VSD systems.

Integrated VSD

Advantages

1. Optimized design

Integrated VSD compressors are designed with the VSD component built into the system. This ensures that all parts work seamlessly together, resulting in higher efficiency and reliability.

2. Inverter duty motor

Integrated VSD compressors often feature inverter duty motors that are specially designed to handle variable speeds without overheating. This leads to better performance and longer lifespan of the equipment.

3. No speed windows

Integrated VSDs eliminate the need for speed windows, which are speed ranges that are avoided to prevent resonating frequencies. This results in large energy savings and better fit to the application

4. Turndown

Integrated VSDs offer upto 85% turndown, leading to more energy savings by allowing the system to operate efficiently at lower speeds.

Benefits

1. Energy efficiency

Integrated VSDs provide superior energy efficiency compared to retrofitted systems. They can adjust the motor speed more precisely, leading to greater energy savings.

2. High performance levels

Integrated VSD compressors offer superior performance compared to retrofitted systems. They provide consistent torque and efficiency across a wide range of speeds, making them ideal for applications with variable demand.

3. Reduced maintenance

With fewer components and optimized design, integrated VSD compressors require less maintenance. This translates to lower maintenance costs and less downtime. 

4. Longer equipment life

The seamless integration of the VSD component with the compressor motor ensures that the equipment operates efficiently and reliably, leading to a longer lifespan.

5. Environmental impact

Integrated VSD compressors contribute to a lower carbon footprint by reducing energy consumption and improving overall efficiency. 

The combined benefits of increased turndown, no unload or losses due to unecessary extra speeding, increased reliability, a single seamless controller, and low harmonics and EMC compliance, means higher power savings with integrated VSD.

Conclusion

Both retrofitted and integrated VSD systems offer significant advantages and benefits. Retrofitted VSD systems provide a cost-effective solution for upgrading existing equipment, offering flexibility and energy savings. On the other hand, integrated VSD compressors deliver optimized performance, reduced maintenance, and longer equipment life, making them a superior choice for applications with variable demand.

 

Ultimately, the choice between retrofitted and integrated VSD systems depends on the specific needs and budget of the business. By understanding the advantages and benefits of each approach, businesses can make an informed decision that aligns with their operational goals and sustainability objectives.

Need more information?
Need more information?
Contact your Atlas Copco representative today!
 
Contact your Atlas Copco representative today!
Designed for reliability
Designed for reliability
Our oil-injected rotary screw G compressors are powerful and reliable industrial screw compressors. Built from high-quality components and materials, they provide a reliable source of high-quality air in temperatures.
 
Our oil-injected rotary screw G compressors are powerful and reliable industrial screw compressors. Built from high-quality components and materials, they provide a reliable source of high-quality air in temperatures.
Advanced connectivity with a SCADA connection
 Advanced connectivity with a SCADA connection
Advanced connectivity with a SCADA connection
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What is VSD compressor technology

What is VSD compressor technology

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