Pre-Installation Planning - Electrical Considerations

System Monitor Function Blocks

The HC900 Controller includes function blocks that enable the user to monitor the status of system functions. When constructing a control configuration, add the following function blocks to the control strategy:

•ASYS - System Monitor

•FSYS - Fast System Monitor

•RK - Rack Monitor

These function blocks are described in the HC900 Function Block Reference Guide.

Master Control Relay

A Master Control Relay (MCR) structure is a safety mechanism for shutting down the process control system in emergency conditions. This mechanism, which is hard-wired (provided and installed by the User) can include several Emergency Stop switches., strategically located near process equipment. An example of an MCR structure is given in Figure 22.

Operating any of the Emergency-Stop switches opens the holding path for the MCR. When the MCR de-energizes, the MCR contact opens, disconnecting all AC power that is supplied to AC Input Modules and to AC Output Modules. Notice that AC power is disconnected only from the AC input/output modules. Power is still available to Power Supplies at the Controller Rack and at each I/O expansion rack. The Controller Module and the Scanner Modules in the racks continue to execute diagnostics and other programs.

The Master Control Relay does not remove power from the Controller rack or from any of the I/O expansion racks.

•Before performing service tasks such as installation of terminal connections or fuse replacement, use the appropriate switch(s) to disconnect power from the power supply at each module.

•Ensure that wiring design precludes over-riding of the MCR by operator actions.

Failure to comply with these instructions could result in death or serious injury.

Class 1, Division 2 Installations

•DO NOT REMOVE OR REPLACE MODULES WHILE CIRCUIT IS LIVE UNLESS THE AREA IS KNOWN NOT TO CONTAIN FLAMMABLE VAPORS.

Revision 5

HC900 Hybrid Controller Installation and User Guide

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Honeywell HC900 manual System Monitor Function Blocks, Master Control Relay
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HC900 specifications

The Honeywell HC900 is a robust control solution designed to meet the demands of process industries. This flexible and powerful platform provides a comprehensive set of features tailored for process control and monitoring applications. The HC900 is particularly suited for batch control, continuous processes, and discrete applications, making it a versatile choice for a variety of industries, including oil and gas, chemicals, and electricity generation.

One of the main features of the HC900 is its modular design. This allows users to customize their control systems by selecting from a range of I/O modules, communication options, and control strategies. The system supports both analog and digital inputs and outputs, enabling seamless integration with existing infrastructures. Additionally, the modular approach enhances scalability, allowing users to expand their systems as their needs evolve.

The HC900 is equipped with advanced control technologies, including adaptive control, multivariable control, and real-time data logging. These capabilities facilitate fine-tuned control over complex processes, improving efficiency and reducing waste. The system can manage multiple process loops simultaneously, providing operators with a holistic view of their operations.

Another significant characteristic of the HC900 is its intuitive user interface. The system features a graphical display that allows operators to monitor system performance easily and make adjustments quickly. This user-friendly design minimizes training requirements and encourages efficient operation across different experience levels.

Furthermore, the HC900 incorporates sophisticated data management tools. With built-in logging and reporting functions, users can track process variables and generate comprehensive reports for analysis and regulatory compliance. This data-centric approach fosters informed decision-making and enhances overall operational effectiveness.

From a communication standpoint, the HC900 supports a variety of protocols, making it compatible with many industry-standard devices. This interoperability ensures that users can integrate the HC900 into their existing systems without hassle, streamlining migration and upgrade processes.

Additionally, the HC900 is built with reliability in mind. Its rugged design ensures durability, capable of withstanding harsh environments while maintaining consistent performance.

In summary, the Honeywell HC900 stands out as a powerful and flexible control solution, equipped with modular design, advanced control technologies, and user-friendly interfaces that cater to the diverse needs of process industries. With its comprehensive data management capabilities and robust communications options, the HC900 is an excellent choice for organizations striving for efficiency and reliability.
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