Before embarking on the Advanced Settings, please familiarise yourself with the basic operation of the controller as described in this manual. The following instructions assume that the user understands how to make the initial configuration, can navigate through the Function Menu and successfully Autotune the controller in heating mode.

HEAT COOL STRATEGY CONFIGURATION

Using SP2.A Cool option

Heat-Cool strategy is a feature that improves control of processes that need heating and cooling, depending on the conditions, for example:

Environmental test chambers used in rooms where the ambient temperature swings above and below the test temperature.

Plastics extruders where the material initially needs heating, then cooling, when it begins to heat itself exothermically due to pressure and friction applied by the process.

The purpose of cool strategy is to maintain smooth control of the process during transition from heating to cooling.

This is achieved by using PID control for heating and cooling with the proportioning bands linked by an adjustable deadband.

ADVANCED SETTINGS

From cold (normal procedure on a new installation)

Enter setpoint and allow the process to reach the setpoint using factory settings for heating only.

Autotune at setpoint

Make the following pre-settings:

Level 1

set

DAC to 1.0 CYC.T to 10 and CYC.2 to 10

Level 2

set

SP2.A to Cool

Level 1

set

TUNE to At.SP

Autotune will cause a temporary disturbance. Check that the temperature has stabilised in heating mode before running the process in cooling mode.

If regular temperature oscillations occur, change CYC.t to optimum value. See page 9. To select Autotune Calculated Cycle-time

Further adjustments – Cooling

Autotune uses the same calculated bAnd value for both SP1 (heating) and SP2 (cooling). In some processes, regular temperature oscillations occur when cooling.

Make the following manual adjustment:

In level 1 double the value of

BND.2

A d v a n c e d S e t t i n g s

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Omega Engineering CN9400 specifications Advanced Settings, V a n c e d S e t t i n g s, Heat Cool Strategy Configuration
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CN9400 specifications

The Omega Engineering CN9400 is a cutting-edge device designed for precision temperature control and monitoring in industrial and research applications. This versatile instrument is renowned for its high accuracy, stability, and user-friendly interface, making it an essential tool for engineers and technicians alike.

One of the standout features of the CN9400 is its advanced PID control algorithm. This method ensures that temperature fluctuations are minimized, allowing for precise temperature management in processes that require strict adherence to specific thermal conditions. The PID control system continuously calculates the error between a desired setpoint and a measured process variable, adjusting the control output to achieve optimal performance.

The CN9400 is equipped with a large, easy-to-read LCD display that provides real-time data on temperature readings and system status. Users can view both set point and actual temperature simultaneously, enabling quick and informed decisions during critical operations. Additionally, the display features customizable alerts and notifications that inform operators of any deviations or potential issues, ensuring a proactive approach to process control.

In terms of connectivity, the CN9400 offers a variety of options, including RS-232 and RS-485 communication protocols, enabling seamless integration into existing control systems. This connectivity ensures that users can monitor and control the device remotely, enhancing operational efficiency and flexibility.

Another noteworthy characteristic of the CN9400 is its robust construction. Designed for durability, it can withstand harsh industrial environments, including extreme temperatures and vibrations. The device is also compatible with various types of temperature sensors, such as thermocouples and RTDs, providing users with the flexibility to select the most appropriate sensor type for their specific application.

In addition to its technical capabilities, the Omega Engineering CN9400 is designed with user convenience in mind. The intuitive menu-driven interface allows for easy programming and operation. Users can quickly navigate through settings and parameters without extensive training, minimizing downtime and enhancing productivity.

Overall, the Omega Engineering CN9400 is a powerful and reliable temperature controller that combines advanced technology with user-friendly features. Its precision, durability, and connectivity make it an ideal choice for a wide range of industrial and research applications, ensuring accurate temperature management in even the most demanding environments.
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