Section 6 • Compressor Control

grayed out and hence, the user will not be able to op- erate Pulldown feature. This is done to keep Pulldown & Pumpdown features mutually exclusive.

Control Mode

This drop down box gives the operator the ability to change the type of control mode such as suction pres- sure control or process temperature control. The opera- tor can also switch from setpoint 1 and setpoint 2 for each control method. What is available in this dropdown box is dependent on the number and type of control se- lected in the configuration screen.

Slide Valve Setpoint:

Operator editable labels for the each output. Slide %:

Indicates the capacity slide position where the digital output is triggered.

State Below Setpoint:

Defines the state of the digital output when the slide position is below the “Slide %” setpoint. The operator can choose between “N.O.” or “N.C.”

Active:

• Check box to enable the digital output.

Stop Load and Force Unload

The stop load and force unload feature’s primary pur- pose is to attempt to prevent the compressor from tripping off due to particular instrument reading. For example, if the suction pressure drops too low, the com- pressor will trip off for safety reasons. However, the stop load & force unload algorithm recognizes a potential trip and either stops the compressor from loading up or even unloads the compressor to prevent the trip.

Stop load:

When this value is reached, the capacity slide will not advance in any condition.

Force Unload:

When this value is reached, the capacity slide posi- tion will decrease until the variable reading is below this value.

High Motor Amps:

Motor current values for stop load and force unload. High Discharge Pressure:

Discharge pressure value for stop load and force unload.

Low Suction Pressure:

• Suction pressure values for stop load and force unload

Capacity Slide Triggered Outputs

The Vission 20/20 offers two digital outputs that can be triggered at a specified capacity slide position. By de- fault, the outputs are preselected for economizer and hot gas bypass. However, these preselected outputs are customizable by the operator.

Volume Slide Position Offset

These setpoints offer the ability to alter the Volume po- sition table to take advantage of potential energy sav- ings. Since the volume position is a function of the ca- pacity position, the offset to the volume is based on the position of the capacity slide. The volume offset can be applied to the entire capacity slide range or just a por- tion using the Capacity Range minimum and maximum setpoints.

Volume Slide Adjustment %:

The value in percentage of the volume slide offset. Capacity Range:

Defines the range that the volume position slide off- set will be applied.

Soft Load

This setpoint is used to slow the loading of the compres- sor. In some refrigeration systems, a loading compres- sor can have dramatic effects on the system parameters. This setpoint allows an operator to reduce the continu- ous load pulse as defined in the proportional control sec- tion to a percent duty cycle.

Soft load %:

Defines the duty cycle of the continuous load pulse. At 100%, the continuous pulse will truly be continu- ous. At 50%, the continuous pulse would be reduced to half time on and half time off in the time interval defined in the proportional control section.

6 – 6

Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153

Page 44
Image 44
Emerson 20/20 Control Mode, Stop Load and Force Unload, Capacity Slide Triggered Outputs, Volume Slide Position Offset

20/20 specifications

Emerson 20/20 is an advanced platform designed for real-time data analytics, visualization, and operational optimization in industrial settings. This robust solution aims to empower organizations by providing actionable insights derived from their operational data, enabling enhanced decision-making and improved efficiency.

One of the standout features of Emerson 20/20 is its ability to integrate seamlessly with various sources of data, whether structured or unstructured. It consolidates information from different systems, such as historians, control systems, and ERP software, allowing users to gain a comprehensive view of their operations. This integration capability is crucial for businesses looking to maximize their data utilization without being confined to a single data source.

The platform employs powerful analytics tools that utilize machine learning and artificial intelligence technologies. These tools are designed to automatically identify patterns, anomalies, and trends in real-time. By leveraging predictive analytics, Emerson 20/20 helps organizations forecast potential issues before they escalate, allowing for proactive maintenance and minimizing downtime.

Emerson 20/20 also features user-friendly visualization dashboards, which provide customizable views tailored to individual user roles. This means that whether you are a plant manager, a process engineer, or an executive, you can access relevant data that speaks directly to your needs. These dashboards facilitate easier understanding of complex data sets, promoting informed decision-making across the organization.

One notable characteristic of Emerson 20/20 is its adaptability and scalability. Businesses of all sizes can implement the platform and scale its features according to their needs. This flexibility ensures that both small operations and large enterprises can derive value from the solution, making it an attractive option for various industries.

Additionally, the platform is designed with cybersecurity in mind, ensuring that data integrity and confidentiality are maintained. This aspect is increasingly important as industries become more interconnected and target more sophisticated cyber threats.

In summary, Emerson 20/20 stands out as a powerful tool for organizations seeking to harness their operational data effectively. With its advanced analytics capabilities, seamless integration, customizable visualization, and scalable design, it offers a comprehensive solution to optimize industrial performance and support data-driven decision-making. As businesses continue to navigate the complexities of modern operations, Emerson 20/20 provides the insights necessary to stay competitive and responsive to changing market demands.