Omega-engineering CN9400 User Manual download pdf (Page 7)

Overview

OVERVIEW

INSTALLATION

The Model CN9400 controller is designed to be mounted in a 1/16

DIN panel cut-out. See the INSTALLATION section.

SET-UP

After installation the controller requires programming with the

following information:

Type of Input Sensor

Operating unit (C or F etc)

Type of Output Device

Temperature Setpoint

Note: The controller will not be operational until this

information is entered.

When the above information has been programmed into the

controller it will be operational with the following factory PID

(proportional band, integral time, derivative time) settings.

Proportional band/Gain 10°C/18°F

Integral time/Reset 5 mins

Proportional cycle-time 20 secs

Derivative time/Rate 25 secs

DAC Derivative approach control 1.5

AUTOTUNE

To precisely control an application the controller will need to be

‘tuned’ using the built-in ‘AUTOTUNE’ feature. Autotune ‘teaches’

the controller the main characteristics of the process and ‘learns’ by

cycling the output on and off. The results are measured and used to

calculate optimum PID values which are automatically entered in the

controller memory.

During AUTOTUNE the optimum cycle-time is calculated but is not

automatically implemented. The cycle-time requires manual

acceptance unless pre-selected.

To ensure good control over a wide range of applications two

versions of the Autotune program are provided, TUNE and TUNE AT

SETPOINT.

The TUNE method normally achieves the best results. Starting with

the load cool, tuning occurs during warm-up preventing overshoot.

This method of tuning is recommended.

The TUNE AT SETPOINT method is used for specialist applications.

eg. Heat-cool, multizones and processes below 100°C/200°F. During

the tuning cycle some overshoot occurs because the tuning cycle is

at set point.

The DAC setting is not re-calculated.

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Omega-engineering CN9400 User Manual Page 7

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