Control Transformer and Fuses, Fan Safety Switch

Component Operation and Maintenance

Control Transformer and Fuses

The control system is divided into four separate circuits. The control voltage circuits are individually protected by fuses located on the transformer/fuse board. If any of the fuses are blown, first eliminate shorts, then use spare fuses supplied with unit. Use only type and size of fuse specified for your unit.

The small isolation transformer on the board supplies 24 volts to the main control board. The trans- former is internally protected. If the internal protector opens, the transformer/fuse board must be replaced. Also check the control voltage fuse on the main control board before replacing the trans- former/fuse board.

Fan Safety Switch

The Fan Safety Switch is located in the low voltage compartment and consists of a diaphragm switch and interconnecting tubing to the blower scroll. The Fan Safety switch is wired directly to the control circuit to activate the alarm system if the airflow is interrupted

High-Temp Sensor

The optional high-temp sensor is a bimetal-operated sensing device with a normally closed switch. This device will shut down the entire unit when the inlet air temperature exceeds a preset point. It is connected between Terminals 1 and 2 at Plug P39.

Smoke Detector

The optional smoke detector power supply is located on the base of the upflow units, and at the top of downflow units. It is constantly sampling return air through a tube. No adjustments are required.

Water Detection Sensor

! WARNING

Risk of fire or explosion. Can cause injury or death.

Do not use near flammable liquids or for flammable liquid detection.

The optional water detection devices available are a point leak detection sensor and a zone leak detec- tion kit.

Figure 21 Liebert leak detection units

Liebert Liqui-tect Point

Leak Detection Sensor

LT460 Zone Leak Detection Kit

The point leak detection sensor provides leak detection at a critical point. A simple two-wire connec- tion signals the alarms at a Liebert environmental unit or at a monitoring panel. Run wires to the Liebert unit and connect them to terminals 24 and 51, 55 or 56. Use NEC Class 2, 24V wiring. The sensor contains a solid state switch that closes when water is detected by the twin sensor probes. The sensor is hermetically sealed in all thread PVC nipple and is to be mounted where water problems may occur. The sensor should be located 6-8 feet (2-2.5m) from the environmental control unit in a wet trap or near a floor drain. It should not be mounted directly under the unit.

3000/ITR specifications

The Emerson 3000/ITR is a powerful and versatile instrument designed for industrial automation and process control applications. This modular platform integrates advanced features and technologies tailored to meet the needs of diverse industries including oil and gas, pharmaceuticals, and manufacturing.

One of the main features of the Emerson 3000/ITR is its exceptional scalability. The system can be easily expanded to accommodate growing operational demands. With its modular architecture, operators can add or remove components without significant downtime, ensuring continuous productivity. This flexibility allows businesses to adapt their systems to changing environments and requirements seamlessly.

The Emerson 3000/ITR leverages state-of-the-art communication technologies to ensure reliable data exchange between devices. With support for various protocols, including Hart, Modbus, and Profibus, the system can easily integrate with existing infrastructure. This adaptability enhances interoperability and simplifies the communication between field devices and control systems, promoting efficient data handling.

Built with robust security features, the Emerson 3000/ITR guarantees the integrity of sensitive data. The platform incorporates advanced encryption techniques and user authentication protocols to protect against potential cyber threats. This focus on security is essential in today’s digitally connected industrial environments.

Another key characteristic of the Emerson 3000/ITR is its user-friendly interface. The system is designed with operators in mind, featuring intuitive controls and comprehensive dashboards that provide real-time visibility into process performance. The graphical user interface simplifies complex operations, enabling quick decision-making and minimizing human errors.

Additionally, the Emerson 3000/ITR supports advanced analytics capabilities that enhance operational efficiency. By leveraging predictive analytics and machine learning algorithms, the system can identify patterns and anomalies, allowing for proactive maintenance and reducing the risk of unexpected downtime. This predictive maintenance approach helps organizations optimize their resources and extend the lifecycle of their equipment.

In conclusion, the Emerson 3000/ITR stands out as an exemplary solution for modern industrial automation. Its modular design, robust communication support, strong security measures, user-friendly interface, and advanced analytics capabilities make it an ideal choice for businesses looking to enhance their operational efficiency and adaptability. As industries continue to evolve, the Emerson 3000/ITR remains at the forefront, facilitating smarter and more efficient automation processes.