Section 7 • Alarms and Trips

selected in the Control Mode dropdown selection found in the Compressor Control screen. An alarm or trip will be activated on a drop in process tempera- ture below the setpoint value.

Low Suction Temperature (Alarm & Trip):

This is the low suction temperature safety. The alarm or trip will be activated if the suction temperature drops below the setpoint value.

High Discharge Temperature (Alarm & Trip):

This is the high discharge temperature safety. The alarm or trip will be activated if the discharge tem- perature rises above the setpoint value.

Low Oil Separator Start Temperature (Alarm & Trip):

This is the starting low oil separator temperature safety. The compressor is prevented from starting or running if the oil in the separator is below the alarm value. After a time delay (setting of the Oil Separator Temperature Safety Changeover timer), this safety is deactivated and the Low Oil Separator Run Temperature alarm and safety setpoints become active.

Low Oil Separator Run Temperature (Alarm & Trip):

This is the running low oil separator temperature safety. After a time delay, (setting of the Oil Separator Temperature Safety Changeover timer), the Low Oil Separator Start Temperature is bypassed and Low Oil Separator Run Temperature alarm and safety set- points become active. The alarm or trip will be acti- vated if the oil temperature in the separator drops below the setpoint value.

Low Oil Injection Temperature (Alarm & Trip):

This is the low oil injection safety. The alarm and trip setpoints are bypassed at start for a time pe- riod (setting of the Oil Injection Temperature Safety Changeover timer). The alarm and trip will be acti- vated after the time delay has expired.

High Oil Injection Temperature (Alarm & Trip):

This is the high oil injection temperature safety. The alarm or trip will be activated if the oil injection tem- perature rises above the setpoint value.

Pre-lube Oil Pressure (Alarm & Trip):

This is the pre-lube oil pump failure safety. If the pre-lube oil pressure does not rise above the alarm setting with in 60 seconds for a minimum time set at Minimum Comp. Pre-lube Time, then the start sequence will be aborted. The Minimum Comp. Pre- lube Time is set on the Timer screen. The pre-lube oil pressure is defined as manifold pressure minus dis- charge pressure. This safety insures adequate lubri- cation of the the compressor at startup.

Low (Run) Oil Pressure (Alarm & Trip):

This is the running oil pressure safety. The normal alarm and trip setpoints of this safety are “messaged” as soon as the compressor starts. The “Pre lube Oil Pressure” Alarm and Trip setpoints are substituted into this safety setpoints for a time of the “Oil Pressure Bypass” timer (typically 60 seconds). After this timer expires, then the setpoints return back to the normal settings. The action of adjusting the setpoints for about a minute allows the (Run) Oil Pressure to build up to normal running pressures after the compressor starts. After the Oil Pressure Bypass Timer has ex- pired, the Oil Pressure must be above the normal set- points, or else an Alarm or Trip will occur. An alarm or trip will be active if the oil pressure drops below the normal setpoint values after the Oil Pressure Bypass timer has expired. This time limit is set on the Timer menu screen. Run oil pressure is defined as manifold pressure minus suction pressure.

High Filter Differential Pressure Start (Alarm & Trip):

This safety allows a higher than normal filter differ- ential pressure to exist during the first minute after a compressor starts. This allows time for cold oil that is present in the oil piping and filters to be passed and replaced with warmer oil. After a time delay (set- ting of the Filter Diff Pressure Safety Changeover timer), this safety is deactivated and the High Filter Differential Pressure-Run alarm and safety setpoints become active. An alarm or trip will be active if the filter differential (= Filter Inlet Pressure minus Filter Outlet Pressure) exceeds the setpoint value.

High Filter Differential Pressure Run (Alarm & Trip):

This safety setpoint is active when the compres- sor has started and the Filter Diff Pressure Safety Changeover timer has timed out. An alarm or trip will be active if the filter differential (= Filter Inlet Pressure minus Filter Outlet Pressure) exceeds by the setpoint value.

High Motor Amps:

This safety setpoint is active after the Volume Decrease At Start Timer expires (this timer is not set- table by the operator). A trip will occur if the motor amperage exceeds the safety setpoint value. For a motor with a 1.15 Service Factor, the trip setpoint should be set at 125% of the motor full load amper- age value. The alarm setpoint should be set at 120% of the motor full load amperage value.

7 – 2

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

Page 48
Image 48
Emerson 20/20 service manual Alarms and Trips

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.