Delta Inverters: Comprehensive Introduction, Products and Applications

Introduction to Delta Inverters

In the modern industrial automation landscape, variable frequency drives (VFDs), also known as inverters, play a pivotal role in controlling motor speed and optimizing energy consumption. Among the leading brands in this field, Delta, a global provider of power and thermal management solutions, has established a strong reputation for its high-quality, innovative inverter products. Delta inverters integrate advanced power electronics and microcomputer control technology, converting fixed-frequency and fixed-voltage AC power into variable-frequency and variable-voltage AC power to precisely control motor speed, enabling precise mechanical process control and significant energy savings.

Delta has accumulated decades of experience in power electronics and industrial automation, leveraging its core technological advantages to develop a comprehensive lineup of inverter products. From micro-power models to high-power solutions, and from general-purpose drives to industry-specific specialized machines, Delta's inverter series cover a wide range of power levels and application scenarios. Each product series is optimized based on the specific requirements of different applications in terms of torque, energy loss, overload capacity, and overspeed operation, and can be adjusted according to the attributes of different industrial applications. This comprehensive product portfolio not only meets the diverse needs of customers but also effectively reduces application costs, making it a preferred choice for industrial automation control systems worldwide.

Core Product Series and Key Features

Delta offers a diverse range of inverter series tailored to different application requirements, each with unique features and performance advantages. Let's take a closer look at some of the flagship product series:

The MH300 series is Delta's new generation of compact and high-efficiency vector control inverters. Inheriting Delta's excellent driving performance, this series features five major advantages: compact size, flexible application, stable system, reliable quality, and easy installation. It can effectively utilize limited space and improve equipment efficiency, converting every ounce of industrial input into fruitful output and enhancing industrial competitiveness. The MH300 series has an overload capacity of up to 150% for 60 seconds and 200% for 3 seconds, making it suitable for various constant-torque loads. It supports both induction motors and permanent magnet synchronous motors, and can be optionally equipped with a PG card for high-precision speed and positioning control. In terms of low-frequency output torque, it delivers outstanding performance: 0.5 Hz / 200% for open-loop vector control and 0 Hz / 200% for closed-loop PG vector control, helping heavy-load equipment maintain stable operation under low-speed and high-torque conditions. Additionally, the MH300 series has built-in USB functionality for fast parameter copying, which greatly improves production and debugging efficiency. It also comes with a built-in 5k-step PLC that supports program programming, saving system configuration costs, and an STO (SIL2 / PL d) safe stop function to enhance equipment safety and reliability.

The CH2000 series is a high-performance vector inverter launched by Delta with a new-generation drive technology. It features large starting torque and high overload capacity, designed to meet the requirements of impact loads and heavy-load applications, achieving fast response and stable and safe operation. This series supports EtherCAT motion control bus, and combined with Delta's self-designed high-efficiency servo motors, it provides a complete set of motion control solutions. When paired with the motion control card (EMC-MC01), it supports cyclic synchronous position mode (CSP) and cyclic synchronous torque mode (CST). The overload capacity of the CH2000 series reaches 150% rated output current for 60 seconds and 200% for 3 seconds, and it supports both induction motors and permanent magnet motors. With magnetic field-oriented control, the closed-loop speed control ratio reaches 1:10,000 (FOCPG). It also has specialized lifting functions such as full-time anti-sway, loose rope detection/light hook acceleration, double main hook synchronization, and deviation correction, making it particularly suitable for crane applications, machine tools, and printing machinery.

The ME300 series is a new generation of compact and simple vector control inverters from Delta. Even with a 60% reduction in volume compared to previous generations, it still inherits the high-level performance of Delta inverters. This series has a double rating mode: for normal loads, it can handle 120% overload for 60 seconds or 150% for 3 seconds; for heavy loads, it supports 150% for 60 seconds or 200% for 3 seconds. It provides 200% starting torque at 0.5 Hz and has a built-in brake crystal across the entire series. The ME300 series supports both induction motors and permanent magnet (IPM / SPM) motors, and has built-in Modbus communication interface. It also offers models with EMC filters and safe torque off STO (SIL2) functionality, meeting the requirements of different application scenarios for safety and electromagnetic compatibility. Thanks to its ultra-small size design and user-friendly operation, the ME300 series is widely used in food and beverage, packaging equipment, conveyor belts, electronic assembly, woodworking machinery, fans, and water pumps.

In addition to these main series, Delta also has other specialized product lines such as the CP2000 series for fan and pump applications, the VFD-ED series for elevator door control, and the HES series for rubber and plastic applications, covering almost all industrial application scenarios.

Advanced Technological Advantages of Delta Inverters

Delta inverters stand out in the highly competitive inverter market due to their continuous technological innovation and emphasis on product quality. Several key technological advantages have helped Delta gain wide recognition from customers:

First, excellent driving performance and torque control. Delta inverters use advanced vector control algorithms to achieve precise control of motor torque and speed. For example, in the MH300 series, the low-frequency output torque can reach 200% at 0 Hz in PG vector control mode, which is crucial for heavy-load starting scenarios such as cranes and machine tools. This strong low-frequency torque capability ensures that heavy-load equipment can start smoothly and maintain stable operation under low-speed conditions, avoiding problems such as stalling and torque fluctuation. In terms of tension control applications, Delta's MH300 series has built-in dedicated tension functions, including built-in roll diameter calculation, two sets of PID parameters, tension taper calculation, friction and inertia compensation during torque control, and automatic roll change. These functions enable constant tension control during winding and unwinding processes, effectively preventing material wrinkling and deformation, and improving product quality.

Second, flexible system integration and expansion capabilities. Delta inverters are designed with open system architecture, supporting a variety of communication protocols to meet the needs of different industrial automation systems. Most series come standard with Modbus and CANopen communication, and optional communication cards are available for EtherNet/IP, Modbus TCP, EtherCAT, DeviceNet, PROFIBUS DP, PROFINET and other protocols, enabling easy access to various industrial control networks. In terms of hardware expansion, Delta inverters also provide flexible expansion options. For example, the MH300 series has two built-in accessory card slots, which can simultaneously install PG cards, I/O expansion cards, communication cards, or 24 V power cards. It can expand 3 groups of DI and 3 groups of DO, a total of 6 contacts, and can also expand 2 or 3 groups of relays, which can be flexibly configured according to different application requirements. The built-in PLC function also allows users to implement simple control logic directly on the inverter, reducing the need for external PLC controllers and lowering system cost and complexity.

Third, high reliability and safety design. Delta attaches great importance to the reliability and safety of its products. All Delta inverters use 100% circuit board coating, which meets the IEC 60721-3-3 class 3C3 standard, greatly enhancing environmental resistance and enabling stable operation in harsh industrial environments with high humidity, dust, and corrosion. In terms of functional safety, most new series come with built-in STO (Safe Torque Off) function, which meets SIL2 / PL d safety level requirements, effectively preventing unexpected movement of equipment and protecting personnel and equipment safety. The common DC bus design supported by the full series also improves energy utilization efficiency, especially in multi-drive systems, where energy can be shared between different inverters, reducing energy waste.

Fourth, user-friendly design and easy maintenance. Delta inverters are designed with the user experience in mind. For example, the ME300 series features user-defined parameter groups and screw-free wiring control terminals, making commissioning and maintenance more convenient. The MH300 series has a built-in USB interface for fast parameter copying, which can greatly shorten the downtime when replacing the inverter. Many models also support detachable fans and control terminals, making replacement and maintenance faster. The wall-through installation option also improves the system protection level, making it easier to adapt to harsh installation environments.

Main Application Fields and Typical Cases

Thanks to their comprehensive product lineup and excellent performance, Delta inverters are widely used in various industries. Here are some of the main application areas and typical use cases:

Machine tools and processing equipment. Machine tools require high-precision speed and position control, as well as strong overload capacity. Delta's MH300 and CH2000 series inverters are widely used in various machine tool applications. With their high-precision vector control and torque output capabilities, they can meet the requirements of different processing techniques, improve processing accuracy and efficiency. For example, in a CNC lathe application, the MH300 series inverter, with the help of PG card high-precision speed control, achieves stable cutting under different cutting conditions, reducing tool wear and improving surface processing quality.

Textile, printing and packaging machinery. In textile machinery, constant tension control is crucial to ensure uniform fabric tension and avoid wrinkling and breaking. Delta's MH300 series inverter has a built-in dedicated tension control function, which can automatically adjust the tension according to the change of roll diameter, achieving stable tension control during the winding and unwinding process, effectively improving product quality and production efficiency. In packaging machinery, the compact ME300 series inverter is widely used in conveyor belts and packaging action control. Its small size saves installation space, and the built-in PLC function can achieve simple packaging process control, reducing system cost.

Fan and pump applications. Fans and pumps are large energy consumers in industrial production. Using inverters for speed regulation can achieve significant energy saving effects. Delta's ME300, CP2000, and VP3000 series inverters are specifically optimized for fan and pump applications. The ME300 series has built-in single/multiple water pump parallel control functions, supporting functions such as water pump sleep and water leakage detection, and can realize alternate operation and constant pressure parallel control of up to 4 pumps, which is very suitable for urban water supply and HVAC systems. According to industry data, after using Delta inverters for energy-saving transformation, fans and pumps can generally achieve energy savings of 20% to 50%, bringing significant economic benefits to enterprises.

Hoisting and lifting industry. The CH2000 series inverter, with its high overload capacity and specialized hoisting functions, is widely used in cranes and lifting equipment. Its full-time anti-sway function, loose rope detection, and double main hook synchronization function improve the safety and working efficiency of cranes. In a port container crane application, after using Delta CH2000 series inverters, the swing of the spreader is significantly reduced, the positioning accuracy is improved, and the loading and unloading efficiency is increased by more than 15%, while also reducing the impact on the mechanical structure and extending the service life of the equipment.

Food and beverage and light industry. In the food and beverage industry, conveyor belts, packaging equipment, and mixing equipment all require reliable speed control. The ME300 series inverter, with its compact size, high reliability, and easy maintenance, has become the first choice for many food processing enterprises. Its high environmental resistance design can adapt to the humid and high-cleaning requirements of the food processing environment, ensuring long-term stable operation of the equipment.

Selection Guide for Delta Inverters

Choosing the right Delta inverter model is crucial to ensure the performance and reliability of the application system. Here are some key selection principles:

First, clarify the power level and load type. The power level of the inverter should be matched according to the power of the controlled motor. At the same time, different load types have different requirements for overload capacity. For constant torque loads such as machine tools and hoisting equipment, it is recommended to choose a heavy-load rating model, such as the MH300 or CH2000 series, which have higher overload capacity to adapt to impact loads. For fan and pump variable torque loads, you can choose a normal-load rating model such as ME300 or CP2000, which can meet the requirements while reducing costs.

Second, consider the control performance requirements. If the application requires high-precision speed control and positioning control, you need to choose a model that supports vector control and can be equipped with a PG card, such as MH300 or CH2000. For applications with general speed control requirements, such as simple conveyor belts, the ME300 series with V/F control can already meet the requirements, which is more cost-effective.

Third, pay attention to communication and expansion requirements. If the inverter needs to be integrated into an industrial Ethernet or fieldbus system, you need to confirm whether the required communication protocol is supported. Delta inverters provide a variety of optional communication cards, which can be configured according to the actual system communication needs. If the application requires additional I/O points or special functions, you need to consider whether there is enough expansion space to install expansion cards.

Fourth, consider installation environment and mechanical dimensions. Different installation methods have different size requirements. For applications with limited installation space, the compact series such as ME300 and MH300 are preferred, which can save a lot of installation space while maintaining performance. If the installation environment is harsh, such as high dust, high humidity, or corrosive gas, you should choose a model with a coated circuit board and higher protection level to ensure long-term reliable operation.

Future Development Trends of Delta Inverters

With the continuous development of industrial automation, the inverter industry is also facing new opportunities and challenges. As a leading brand in the industry, Delta continues to increase investment in research and development, promoting the continuous innovation of inverter technology. In the future, Delta inverters will develop in the following directions:

First, higher efficiency and energy saving. Energy conservation and emission reduction have become a global consensus, and users have higher and higher requirements for the energy efficiency of inverters. Delta will continue to optimize the circuit design and power device selection of inverters, improve the conversion efficiency of inverters, and further reduce energy consumption. At the same time, combined with energy feedback technology, more energy can be recycled in applications with frequent braking, further improving the overall energy efficiency of the system.

Second, higher intelligence and network interconnection. With the advent of the Industry 4.0 era, inverters, as key field devices, need to have stronger data collection and communication capabilities. Future Delta inverters will integrate more intelligent functions, support real-time data collection and remote monitoring, and facilitate the implementation of predictive maintenance and intelligent management. At the same time, the support for high-speed industrial Ethernet protocols will be further improved to better adapt to the requirements of intelligent factory systems.

Third, more compact and integrated design. With the continuous development of industrial equipment towards miniaturization and high density, the requirements for the size of inverters are also getting higher and higher. Delta will continue to optimize the structural design and use more advanced power electronic components to further reduce the size of inverters while improving power density, helping users save equipment space and reduce system volume.

Fourth, industry-specific customized solutions. Different industries have different application requirements, and Delta will continue to deepen the development of industry-specific customized inverter products. According to the special needs of different industries such as new energy, logistics, and textile, targeted functional optimization and product design will be carried out to provide customers with more suitable solutions.

Conclusion

Delta inverters, with their comprehensive product lines, advanced technological advantages, wide range of application scenarios, and reliable product quality, have become one of the most popular inverter brands in the global industrial automation market. Whether it is a simple low-power speed control application or a complex high-precision motion control system, Delta can provide a suitable inverter solution. For enterprises, choosing Delta inverters not only means obtaining high-quality products and advanced technology but also enjoying Delta's global warranty and technical support services. In the future, with the continuous development of industrial automation and intelligent manufacturing, Delta inverters will continue to innovate, help more enterprises achieve energy conservation, efficiency improvement, and industrial upgrading, and create greater value for customers and society.