Response by Control Type—Advanced Microprocessor Controls

Intelligent Control

The Intelligent Control operates from a set of general rules that define how the control output should be adjusted for different system conditions. The rules are designed to duplicate the actions that an experienced human operator would take if manually controlling the system.

Just as an operator might take several things into consideration before making a temperature control decision, the Intelligent Control can be programmed to do likewise. For example, not only is the cur- rent temperature used in making temperature control decisions, but also conditions such as:

•How fast is the temperature changing?

•What direction is the temperature changing?

•What is the cooling output now?

•What was the cooling output in the past?

•How long ago was the cooling output changed?

•Other factors.

Any number of rules can be used in an Intelligent Control to define the controls operation under vari- ous operating conditions. Hence, several advantages are gained from this type of control over a more standard control approach that uses a fixed mathematical equation to define the operation of the con- trol for all conditions (such as a proportional or PID Control). You can expect Intelligent Control to be more efficient and precise for most applications, but system performance based on room conditions is not as predictable as standard approaches that use a fixed equation.

The Liebert Intelligent Control includes rules that significantly enhance the performance of the sys- tem, both from a standpoint of precision control and system reliability.

Rules are included that:

•Cause the control to ignore very small or temporary temperature/humidity deviations. This elimi- nates unnecessary control adjustments that contribute to control instability.

•Help limit the frequency of control adjustments, thus extending the life of system components that are susceptible to mechanical wear or cycling.

•Recognize undesired modes of control operation, such as hunting, and make adjustments to the control response to eliminate them.

•Estimate the present load on the system and then tend to force the control output to the appropri- ate state

•Recognize conditions which indicate a large load change and allow the control to temporarily respond more quickly than normal.

•Cause the control to anticipate the need for reheat during dehumidification and activates reheats before overcooling occurs.

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Emerson VE, VH, DE, DH manual Intelligent Control
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VE, DH, VH, DE specifications

Emerson is a well-known brand in the field of automation solutions, offering a range of products that cater to various industries. Among its diverse portfolio, Emerson’s products like DE (Digital Electronics), VH (Variable Frequency Drives), DH (Distributed Control Systems), and VE (Valve Positioners) stand out for their advanced features, cutting-edge technologies, and unique characteristics.

Digital Electronics (DE) from Emerson represents the backbone of modern automation systems. These devices are characterized by their highly reliable digital communication capabilities, providing robust solutions for process monitoring and control. DE products integrate seamlessly with various automation platforms, allowing for easy data exchange and system interoperability. The advanced analytics embedded in these systems enable predictive maintenance strategies, enhancing overall operational efficiency.

Variable Frequency Drives (VH) are integral to motor control technologies, maximizing energy efficiency in various applications. Emerson's VH drives are designed for flexibility, supporting multiple motor types and configurations. These drives utilize pulse width modulation (PWM) technology, allowing for precise speed control and improved application performance. Their built-in protection features help extend motor life, prevent downtime, and reduce maintenance costs. Furthermore, the user-friendly interfaces of VH drives facilitate quick setup and troubleshooting.

Distributed Control Systems (DH) from Emerson provide a holistic approach to managing complex industrial processes. They enable centralized control while ensuring that local operations continue seamlessly. DH systems are characterized by their modular architecture, making them highly scalable and adaptable to changing operational needs. Advanced control algorithms within these systems help optimize processes, ensuring maximum productivity. Additionally, their enhanced cybersecurity features protect critical industrial operations from potential threats.

Emerson's Valve Positioners (VE) play a crucial role in regulating flow and pressure in various processes. These devices provide precise positioning capabilities, enhancing the performance of control valves. The VE systems incorporate smart technologies such as adaptive control and diagnostics, allowing them to self-tune and deliver accurate performance over time. Their compact design and robust build ensure they operate effectively in challenging environments.

In summary, Emerson's DE, VH, DH, and VE offerings embody the latest innovations in automation technology. Their main features, including digital communication, energy efficiency, scalability, and precision control, cater to the diverse demands of modern industries. With these products, Emerson not only enhances operational efficiency but also paves the way for intelligent automation solutions that are crucial for the future of industrial processes.
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