Novus N2020 Instruction Manual Download Page 4

N2020 Controller  

NOVUS AUTOMATION 

4/7 

OUT  indicator

:  It shows the instantaneous state of the controller 

output(s). 

A1 and A2 indicator

: signalize the occurrence of alarm situation. 

P  key

:  Key used to forward the successive parameters and 

parameters cycles. 

 

  Increment key and 

 

  Decrement key

:  allow  altering the 

values / conditions of the parameters. 

 

 Back key

: allow altering the values of the parameters. 

START-UP 

Upon the energizing, the controller shows the number of its software 

version in the first 3 seconds. Then, it shows the process variable 

value (

PV

) measured (temperature) on the upper display. The SP 

value is showed on the lower display. This is the 

Indication Screen

To operate in a process, the controller is required to be configured 

previously. The configuration consists of a definition of each one of 

the several parameters showed. The user must understand about the 

importance of each parameter and, for each one, determine one valid 

condition or a valid value. 
The configuration parameters are together in affinity groups, known 

as parameters cycles. The 6 levels of parameters are: 

Operation / Tuning / Program / Alarms / Input / Calibration 

The 

P

 key is used for accessing the parameters within a level: 

Keeping the 

P

 key pressed, at every 2 seconds the controller jumps 

to the next level of parameters, showing the first parameter of each 

level: 

PV

  >  

atvn

  >  

ptol

  >  

fva1

  >  

type

  >  

pass

  >  

PV

  … 

To enter a particular level, simply release the “

P”

 key when the first 

parameter in that level is displayed. To walk through the parameters 

in a level, press the “

P”

 key with short strokes. To go back to the 

previous parameter in a cycle, press 

 

Each parameter is displayed with its prompt in the upper display and 

value/condition in the lower display. Depending on the level of 

parameter protection adopted, the parameter 

PASS

  precedes the 

first parameter in the level where the protection becomes active. See 

section 

CONFIGURATION PROTECTION

DESCRIPTION OF THE PARAMETERS 

OPERATION CYCLE 

PV + SP 

PV indication

. The measured temperature value (PV) 

is shown on the upper display (red). Control Setpoint 

(SP) value is shown on the lower display (green). 

(trl

  Control Mode: 

avto

 - in automatic mode.   

Man

 

- in manual mode. 

PV + MV 

MV Value

  -  The upper display shows PV value and 

the lower display shows the 

percentage

  of MV 

applied to the control output. 
In automatic control mode, the MV value is showed 

visually only. In manual control mode, 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 enables. 

NO

 

- Outputs not enabled. 

TUNING CYCLE 

Atvn 

Auto-Tune

: Enables the auto-tuning function for the 

PID parameters (

pb

,

ir

dt

). Refer PID Parameters 

Determination chapter in this manual and on website 

www.novusautomation.com

 for further details. 

 

0ff  

- Turned off. (no PID tuning) 

 

Fast

  - Execute the tuning in fast mode.

 

  full 

- Execute the tuning in accurate mode. 

PB 

Proportional Band

  -  Value of the term P of the 

control mode PID, in percentage of the maximum span 

of the input type. Adjust of between 0 and 500.0 %.

 

When set to zero (0), control action is ON/OFF.

  

ir 

Integral Rate

  -  Value of the term 

I

  of the PID 

algorithm, in repetitions per minute (Reset). 

Adjustable between 0 and 99.99. Displayed only if 

proportional band 

 0.  

dt 

Derivative Time

  - Value of the term 

D

 of the control 

mode PID, in seconds. Adjustable between 0 and 300.0 

seconds. Displayed only if proportional band 

 0. 

(t 

Cycle Time

  -  Value in seconds in the PWM cycle 

period of PID control. Adjustable between 0.5 and 

100.0 seconds. Displayed only if proportional band 

 0. 

kyst 

Control Hysteresis

  -  Is the hysteresis for ON/OFF 

control (set in temperature units). This parameter is 

only used when the controller is in ON/OFF mode 

(

Pb

=

0

). 

A(t 

Action Control

re

 

Control with 

Reverse Action

. Appropriate for 

heating

. Turns   control output on when PV is 

below SP. 

dir

  Control with 

Direct Action

. Appropriate for 

cooling

. Turns   control output on when PV 

is above SP. 

sfst 

SoftStart Function

  –  Time interval, in seconds, in 

which the control limits the speed of increase of the 

control output (MV). From 0 to 9999 s. 
Zero value ( 0 ) disables the SoftStart function. 
Displayed only if proportional band ≠ 0. 

0vt1 
0vt2 
0vt3

 

Assign functions to the output channels OUT1, OUT2 

and OUT3: 

Off

 

Not used. 

(trl

 

Control output. 

A1

 

Alarm 1 output. 

A2

 

Alarm 2 output. 

Lbd

 

Loop Break Detect Alarm. 

0vt4 

Operation mode of OUT4 output channel: 

Off 

Not used. 

(trl

 

Digital control output (0 or 20 mA) 

A1

 

Alarm output 1.(0 or 20 mA) 

A2

 

Alarm output 2.(0 or 20 mA) 

Lbd

 

Acts as the output for LB function 

(.020

 

Analogical Control Output 0-20 mA 

(.420

 

Analogical Control Output 4-20 mA 

p.020

 

PV Retransmission 0-20 mA 

p.420

 

PV Retransmission 4-20 mA 

s.020

 

SP Retransmission 0-20 mA 

s.420

 

PV Retransmission 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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