The choice of cycle-time is influenced by the external switching device or load. eg. contactor, SSR, valve. A setting that is too long for the process will cause oscillation and a setting that is too short will cause unnecessary wear to an electro-mechanical switching device.

CYCLE-TIME SELECTION METHODS

The following methods of cycle-time selection may be used:

Autotune calculated

After Autotune has been run and completed the calculated cycle-time can be manually accepted or adjusted to suit the switching device. For selection method see Select Autotune

Calculated Cycle-time.

Pre-select Autotune cycle-time

The controller can be programmed to automatically accept any calculated Autotune cycle-time. For selection method see Pre-Select Automatic Acceptance of Any Autotune

Cycle-time,page 10.

Pre-select before Autotune

The controller can be programmed manually with any cycle-time between 0.1 and 81 sec. This cycle-time will not be changed by any Autotune functions. For selection method see Pre- Select Cycle-time Before Autotune, page 10.

PROPORTIONAL CYCLE-TIME

Factory set

 

 

 

 

 

P

To use the 20 sec factory set cycle-time no action is needed

r

whether autotune is used or not.

 

 

 

 

o p

CYCLE-TIME RECOMMENDATIONS

 

 

 

 

 

 

 

 

 

o

Output

 

Factory

Recommended

 

Load max

 

 

 

 

r

Device

 

Setting

Minimum

 

(resistive)

 

 

 

 

t i

 

 

 

 

 

 

 

Internal relay

 

20 seconds

10 seconds

 

2A/250 Vac

 

rLY/rLY1

 

 

 

o

 

 

 

 

 

 

 

 

 

 

 

 

 

Internal relay

 

20 seconds

10 seconds

 

1A/250 Vac

 

 

 

 

n

rLY2

 

 

 

 

 

 

Solid state

 

20 seconds

0.1 seconds

 

Externally

 

a

drives

 

 

fitted SSR

 

 

 

 

l

SSd/SSd1/SSd2

 

 

 

 

(n/a)

 

 

 

 

 

 

c y

To Select AUTOTUNE CALCULATED CYCLE-TIME

On completion of Autotune enter program mode.

 

 

c l

Select

 

 

 

CYC.T

 

 

 

 

 

e

The controller will display CYC.t and 20 (the factory

 

 

CYC.T

-

setting) in seconds

 

 

 

 

 

 

20

t

 

 

 

 

 

To view the calculated optimum cycle-time press and hold

i

the ✱ button then press and hold ▼ until indexing stops.

m

The controller will display the calculated cycle-time in the

e

lower display e.g. A 16. This indicates that the calculated

cycle-time is 16 seconds

CYC.T

A16

 

9

Page 12 Page 14
Page 13
Image 13
Omega Engineering CN9400 Proportional CYCLE-TIME, CYCLE-TIME Selection Methods, CYCLE-TIME Recommendations, Cyc.T
Page 12 Page 14

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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