Novus N2020 Instruction Manual Download Page 6

N2020 Controller  

NOVUS AUTOMATION 

6/7 

CONFIGURATION PROTECTION 

The controller provides means for protecting the parameters 

configurations, not allowing modifications to the parameters values, 

avoiding tampering or improper manipulation. The parameter 

Protection

  (

PROt

), in the Calibration level, determines the 

protection strategy, limiting the access to particular levels, as shown 

by the below. 

Protection Level 

Protection Levels 

Only the Calibration level is protected. 

Calibration and Input levels are protected. 

Alarms, Input and Calibration levels are 

protected. 

Program, Alarms, Input and Calibration levels 

are protected. 

Tuning, Program, Alarms, Input and 

Calibration levels are protected. 

All levels are protected, but the 

SP

 screen in 

the Operation level. 

All levels are protected, including SP. 

Table 03

 – Levels of Protection for the Configuration 

ACESS PASSWORD 

The protected levels, when accessed, request the user to provide the 

Access Password

  for granting permission to change the 

configuration of the parameters on these levels. The prompt 

PASS

 

precedes the parameters on the protected levels. If no password is 

entered, the parameters of the protected levels can only be 

visualized. 
The Access Password is defined by the user in the parameter 

Password Change (

PAS.(

), present in the Calibration Level. 

The 

factory default for the password code is 1111.

 

PROTECTION ACCESS PASSWORD 

The controller foresees a safety system which helps to avoid the 

input of many passwords, trying to insert the correct one. Once 5 

consecutive invalid passwords are inserted, the controller stops to 

accept passwords for 10 minutes. 

MASTER PASSWORD 

The Master Password is intended for allowing the user to define a 

new password in the event of it being forgotten. The Master 

Password doesn’t grant access to all parameters, only to the 

Password Change parameter (

PAS(

). After defining the new 

password, the protected parameters may be accessed (and 

modified) using this new password. 
The master password is made up by the last three digits of the serial 

number of the controller 

added

 to the number 9000. 

As an example, for the equipment with serial number 07154321, the 

master password is 9 3 2 1. 
Controller serial number is displayed by pressing 

 

 for 5 seconds. 

DETERMINATION OF PID PARAMETERS 

Automatic tuning allows the controller to obtain P.I.D parameters 

(proportional band, full rate, derivative time). 
During the process of determining automatically the PID parameters, 

the system is controlled in ON/OFF in the programmed Setpoint. The 

auto-tuning process may take several minutes to be completed, 

depending on the system. The steps for executing the PID auto-

tuning are: 

- Turn-off the outputs (RUN= NO). 
- Adjust the SP value desired for the process. 
- Enable auto-tuning at the parameter (ATUN= FAST or FULL) 
- Turn-on the outputs (RUN= YES). 

The option 

FAST

 performs the tuning in the minimum possible time, 

while the option 

FULL

 gives priority to accuracy over the speed. 

The sign TUNE remains lit during the whole tuning phase. The user 

must wait for the tuning to be completed before using the controller. 
During the automatic tuning execution, PV oscillations may be 

induced in the process around the setpoint. 
If the tuning does not result in a satisfactory control, refer to 

Table 04

 

for guidelines on how to correct the behavior of the process. 

PARAMETER 

VERIFIED PROBLEM 

SOLUTION 

Proportional Band 

Slow answer 

Decrease 

Great oscillation 

Increase 

Rate Integration 

Slow answer 

Increase 

Great oscillation 

Decrease 

Derivative Time 

Slow answer or instability 

Decrease 

Great oscillation 

Increase 

Table 04

 - Guidance for manual adjustment of the PID parameters 

For further details on PID tuning, visit our web site: 

www.novusautomation.com

MAINTENANCE 

PROBLEMS WITH THE CONTROLLER 

Connection errors and inadequate programming are the most 

common errors found during the controller operation. A final revision 

may avoid loss of time and damages. 
The controller displays some messages to help the user identify 

problems. 

MESSAGE 

DESCRIPTION OF THE PROBLEM 

----

 

Open input. No sensor or signal.   

Err1

 

Err6

 

Connection and/or configuration problems. Check 

the wiring and the configuration. 

Other errors messages showed by the controller represent internal 

damages which implies necessarily in the submission of the 

equipment for maintenance. 

CALIBRATION OF THE INPUT 

Visit our web site for further information 

www.novusautomation.com

IDENTIFICATION 

N2020 - PRR 

Basic version. Three outputs. 
OUT1= pulse / OUT2= relay / OUT3= relay 

N2020 - PRRA 

For outputs. 
OUT1= pulse / OUT2= relay / OUT3= relay 
OUT4= Analogic output 0-20 / 4-20 mA 

Summary of Contents for N2020

Page 1: ...r instrumentation It is strongly recommended to apply RC S FILTERS noise suppressor to contactor coils solenoids etc FEATURES INPUT TYPE SELECTION The input type to be used by the controller is defined in the equipment settings Table 01 shows the input options available for the user one of them must be selected during the controller setting TYPE CODE RANGE OF MEASUREMENT Thermocouple J Tc j Range ...

Page 2: ... control and also with the PID control with the automatic tuning resource ALARM OUTPUT The controller has two alarms which may be directed for any of the output channels These alarms can be configured to operate the different functions described on Table 02 off Alarms turned off lo Alarm of Absolute Minimum Value Triggers when the value of measured PV is below the value defined for alarm Setpoint ...

Page 3: ...This feature is disabed if the parameter is set to 0 zero PROGRAMS OF RAMP AND SOAK The controller allows the creation of one ramps and temperature soaks program This program is created from the values definition of SP and time intervals defining up to nine 9 program segments The figure below shows a program model with 9 segments Fig 04 Example of ramps and soaks program The program created is sto...

Page 4: ...e the MV value may be changed by the user To differ this screen from SP screen the MV value blinks constantly E pr Enable Program Selects the ramp and soak profile program to be executed no the program is not executed yes the program is executed With enabled outputs RvN YES the program starts right after the program is selected rvn RUN Function Enables control outputs and alarms YES Outputs enable...

Page 5: ... measured signal PV Adjustable between 0 and 20 In 0 zero it means filter turned off and 20 means maximum filter The higher the filter value the slower is the response of the measured value Dp po Decimal Point Determines the presentation of the decimal point vni t Unit Defines the temperature unit to be used Indication in Celsius f Indication in Fahrenheit 0ffs Offset Parameter that allows the use...

Page 6: ...roller serial number is displayed by pressing for 5 seconds DETERMINATION OF PID PARAMETERS Automatic tuning allows the controller to obtain P I D parameters proportional band full rate derivative time During the process of determining automatically the PID parameters the system is controlled in ON OFF in the programmed Setpoint The auto tuning process may take several minutes to be completed depe...

Page 7: ...ture sensor 15 minutes minimum time for terminal accommodations shall be observed SAFETY INFORMATION Any control system design should take into account that any part of the system has the potential to fail This product is not a protection or safety device and its alarms are not intended to protect against product failures Independent safety devices should be always provided if personnel or propert...

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