NOVUS N323 User Manual

TEMPERATURE CONTROLLER

N323

OPERATING MANUAL - V1.8x A

SAFETY SUMMARY

The symbols below are used on the equipment and throughout this document to draw the
user’s attention to important operational and safety information.

CAUTION or WARNING:

Read complete instructions prior to

installation and operation of the unit.

All safety related instructions that appear in the manual must be observed to ensure personal
safety and to prevent damage to either the instrument or the system. If the instrument is used

in a manner not specified by the manufacturer, the protection provided by the equipment may
be impaired.

CAUTION or WARNING:

Electrical Shock Hazard

SPECIFICATIONS

INPUT SENSOR: The input sensor type can be chosen form the options below (specified

when placing the order):
 NTC Thermistor, 10 kΩΩΩΩ @ 25 °C; range: –50 to 120 °C (-58 to 248 °F); Accuracy: 1,0 °C

(1,1 °F), with original sensor;
Sensor interchangeability: 1 °C (1.35 °F). This error can be compensated by the offset
parameter in the controller.

 Pt100 (αααα= 385); Range: –50 to 300 °C (-58 to 572 °F); Accuracy: 0,7 °C (1.3 °F); IEC-751.
 Pt1000 (αααα= 385); Range: –200 to 530 °C (-328 to 986 °F); Accuracy: 0,7 °C (1.3° F);
 J, K or T thermocouple (IEC-584):

 Type J: Range: 0 to 600 °C (32 to 1112 °F); Accuracy: 3 °C (5.4 °F);
 Type K: Range: -50 to 1000 °C (-58 to 1832 °F); Accuracy: 3 °C (5.4 °F);
 Type T: Range: -50 to 400 °C (-58 to 752 °F); Accuracy: 3 °C (5.4 °F);

Note: In the controller with NTC input, a 3 m-sensor cable is bundled with the instrument.
The cable can be extended up to 200 m.

WARM-UP:................................................................................................................15 minutes

MEASUREMENT RESOLUTION:

from –19.9 to 199.9º With NTC, Pt100 and Pt1000:.................................................................0.1

elsewhere:.............................................................................................................................1

OUTPUT1:..............................Relay SPDT; 1 HP 250 Vac / 1/3 HP 125 Vac (16 A Resistive)

OUTPUT2:.......................................................................................Relay: 3A / 250 Vac, SPST

OUTPUT3:.......................................................................................Relay: 3A / 250 Vac, SPST

POWER SUPPLY: .................................100~240 Vac (± 10 %) or 24 Vdc/ac (12~30 Vdc/ac)

............................................................Mains frequency: 50~60 Hz. Power consumption: 5 VA

Caution: check the power supply specification before energizing the controller.

DIMENSIONS:..........................................................Width x Height x Depth: 74 x 32 x 75 mm

................................................................................. Panel cut-out: 70 x 29 mm; Weight: 100 g

ENVIRONMENTAL CONDITIONS: ............................................................................5 to 50 °C

Maximum RH: 80 % up to 31 %, decreasing linearly to 50 % at 40 °C. Installation category II.
Pollution degree 2. Altitude < 2000 m.

CASE:...............................Polycarbonate UL94 V-2; Protection: Front panel: IP65, Box: IP42

....................................................................................................Suitable wiring: Up to 4,0 mm²

RS-485 digital communication; RTU MODBUS protocol (optional)

Serial interface not isolated from input circuitry.

Serial interface isolated from input circuitry, except in 24 V powered model.

MAN001279

The N323 is a 3-output digital electronic controller for heating and cooling applications. It is
available with NTC thermistor input sensor, Pt100, Pt1000 or J / K / T type thermocouple.
Sensor offset correction is provided. The 3 independent outputs can be used as control or
alarm. The features of a particular model (input sensor type, sensor range, mains supply, etc)
are identified by the label placed on the controller body.

ELECTRICAL WIRING

It is important to follow the recommendations below:

• Signal wires should be installed in grounded conduits and away from power or contactor

wires.

• The instrument should have its own power supply wires that should not be shared with

electrical motors, coils, contactors, etc.

• Installing RC filters (47 R and 100 nF, series combination) is strongly recommended at

contactor coils or any other inductors.

• The use of protection devices.

Figure 1 below shows the controller connections to sensor, mains and outputs.

Figure 1 – N323 terminals

Pt100 with 3 conductors: Terminals 11, 12 and 13 must have the same wire resistance for

proper cable length compensation. For 2 wire Pt100, short circuit terminals 11 and 13.

OPERATION

The controller requires the internal parameters to be configured according to the intended use
for the instrument. The parameters are organized in 4 groups or levels:

Level Function

0 Temperature measurement

1 Setpoint Adjustment

2 Configuration

3 Calibration

Upon power-up, the N323 display shows for 1 second its firmware version. This information is
useful when consulting the factory.

Then, the temperature measured by the sensor is shown on the display. This is the parameter
level 0 (temperature measurement level).

To access level 1, press for 1 second until the “SP1
again, the “SP2
presented. To go back to level 0, press once more.

To access level 2 of paramenters, press for 2 seconds until the “uNT
shown. Release the key to remain in this level. Each new pressing on the key will

advance to the next parameter in the level. At the end of the level, the controller returns to the
first level (0). Use the and keys to alter a parameter value.

Notes: 1 A parameter configuration is saved when the key is pressed to advance to

Level 1 –Setpoint Adjustment

In this level only the Setpoint (SP1
names with their respective values. Adjust the desired temperature for each setpoint clicking

on the and keys.

SP2” parameter is presented. Pressing again, the “SP 2

SP2SP2

the next parameter in the cycle. The configuration is stored in a non-volatile
memory, retaining its value when the controller is de-energized.

2 If no keyboard activity is detected for over 20 seconds, the controller saves the

current parameter value and returns to the measurement level.

SP1 and SP2

SP1 SP1

SP1” message shows up. Pressing

SP1SP1

SP2) parameters are available, alternating the

SP2SP2

SP2” parameter is

SP2SP2

uNT” message is

uNTuNT

SP1

SP1

SP1SP1

Sp2

Sp2

Sp2Sp2

Sp3

Sp3

Sp3Sp3

Level 2 – Configuration - Parameters configuration Level

Contains the configuration parameters to be defined by the user, according to the system’s
requirements. Use and keys to set the value. The display alternates the parameter

name and respective value.

Unt

Unt

UntUnt

typ

typ

typtyp

ofs

ofs

ofsofs

spl

spl

splspl

spK

spK

spKspK

Ac1

Ac1

Ac1Ac1

Ac2

Ac2

Ac2Ac2

Ac3

Ac3

Ac3Ac3

(nt

(nt

(nt(nt

ky1

ky1

ky1 ky1
ky2

ky2

ky2 ky2
Ky3

Ky3

Ky3Ky3

Hysteresis

SetPoint 1, 2 and 3. Temperature adjustment for control OUTPUT. SP
is limited to the values programmed in SPL
level (Parameter configuration, level 2).

Temperature Unit - Selects display indication for degrees Celsius or
Fahrenheit.

0000 – Temperature in degrees Celsius
1111 – Temperature in degrees Fahrenheit

Input Type - Selects the input sensor type to be connected to the controller.
Available only for thermocouple models, allowing selection of types J, K and
T.

0000 - Thermocouple type J
1111 - Thermocouple type K
2222 - Thermocouple type T

Sensor Offset - Offset value to be added to the measured temperature to
compensate sensor error.

SP Low Limit - Lower range for SP1
programmed with a lower value than spK

SP High Limit - Upper range for SP1
spl

spl.

splspl

Control action for OUTPUT 1 :

0000 Reverse: For heating applications. Outputs turn on when temperature

is lower than SP.

1111 Direct: For cooling applications. Output turns on when temperature is

above SP.

Action 2 - Control OUTPUT 2 and OUTPUT3 action or Alarm funtions:

0000 Reverse control action (heating).
1111 Direct control action (cooling).
2222 Low (minimum) temperature alarm.
3333 High (maximum) temperature alarm.
4444 Alarm for temperature inside the range
5555 Alarm for temperature outside the range.
6666 Low temperature alarm with initial blocking.
7777 High temperature alarm with initial blocking.
8888 Inside range alarm with initial blocking.
9999 Outside range alarm with initial blocking.

The section Working with the Controller describes how these functions
work.

Control - Associates Setpoints and Outputs.

0000 Setpoint 1 is assigned to OUTPUT1 and Setpoint 2 to OUTPUT2

(factory setting).

1111 Setpoint 1 is assigned to OUTPUT2 where as Setpoint 2 is directed to

OUTPUT1.

OUTPUT Hysteresis: defines the differential range between the temperature
value at which the OUTPUT is turned on and the value at which it is turned
off. In degrees.

spK.

spKspK

SP1 and SP2

SP1 SP1

SPL and SPk

SPk in the programming

SPLSPL

SPk SPk

SP1 and SP2

SP1 SP1

SP2. SPL

SP2SP2

SP2. SPx

SPx must be greater than

SP2SP2

SPx SPx

SP value

SPSP

SPL must be

SPL SPL

dl1

dl1

dl1dl1
Dl2

Dl2

Dl2Dl2
Dl3

Dl3

Dl3Dl3
of1

of1

of1of1
Of2

Of2

Of2Of2
Of3

Of3

Of3Of3

On1

On1

On1On1
On2

On2

On2On2
On3

On3

On3On3

2t1

2t1

2t1 2t1
3t1

3t1

3t13t1

Timer T1

2t2

2t2

2t2 2t2
3t2

3t2

3t23t2

Timer T2

Add

Add

AddAdd

Level 3 – Calibration Level

The controller is factory calibrated. The following parameters should be accessed only by
experienced personnel. To enter this cycle, the key must be kept pressed for 4 seconds.

Don’t press the and keys if you are not sure of the calibration procedures.
Just press the key a few times until the temperature measurement level is reached

again.

pas

pas

paspas

[Al

[Al

[Al[Al

[Ak

[Ak

[Ak[Ak

[JL

[JL

[JL[JL

FA(

FA(

FA(FA(

Prt

Prt

PrtPrt

Pa(

Pa(

Pa(Pa(

Sn2

Sn2

Sn2Sn2
sn1

sn1

sn1sn1
sn0

sn0

sn0sn0

Delay 1, 2 and 3 - Delay time to start control. Upon power-on, control OUTPUT
1 is kept off until the time programmed in dl1
to prevent multiple compressors to start simultaneouly after the turn-on of a
system with several controllers. Value in seconds, 0 to 250 s.

Off time 1, 2 and 3 - Defines the minimum off time for control OUTPUT.
Once OUTPUT 1 is turned off, it remains so for at least the time programmed
in of1

of1. For thermocouple inputs this parameter is not available. This

of1of1

parameter is intended for refrigeration systems where longer compressor life
is desired. For heating systems, program of1
to 999 s.

On time 1, 2 and 3 - Defines the minimum on time for control OUTPUT 1.
Once turned on, OUTPUT 1 remains so for at least the time programmed in

on1

on1. For thermocouple inputs this parameter is not available. This

on1on1

parameter is intended for refrigeration systems where increased compressor
life is desired. For heating systems, program on1
0 to 999 s.

Time interval T1 for alarm temporization. Defines the temporization mode
and interval, as shown in Table 4. Adjustable from 0 to 1999 seconds.
Available only when outputs 2 or 3 are configured as alarms.

Time interval T2 for alarm temporization. Defines the temporization mode
and interval, as shown in Table 4. Adjustable from 0 to 1999 seconds.
Available only when outputs 2 or 3 are configured as alarms.

Adress - Controllers with the optional RS485 Modbus RTU communication
interface have the Add
Modbus address for each equipment connected to the network. Address range
is from 1 to 247.

Password - Enter the correct password to unlock write operations for the
parameters in the following levels.

Calibration low - Offset value of the input. It adjusts the lower
measurement range of the sensor.

Calibration High - Gain calibration. It adjusts the upper measurement
range of the sensor.

Cold Junction Offset calibration - This parameter is available only for
thermocouple.

Factory Calibration - Restores factory calibration parameters. Change from
0 to 1 to restore the calibration parameters with factory values.

Protection - Defines the levels of parameters that will be password

protected. See "Configuration Protection" for details.

Password Change - Allows changing the current password to a new one.
Values from 1 to 999 are allowed.

Serial number - First part of the controller electronic serial number.

Serial number - Second part of the controller electronic serial number.

Serial number - Third part of the controller electronic serial number.

Add parameter at the Configuration level. Set a unique

AddAdd

dl1 is elapsed. Its usage is intended

dl1dl1

of1 to zero. Value in seconds, 0

of1 of1

on1 to zero. Value in seconds,

on1on1

WORKING WITH THE CONTROLLER

Multiple output controllers are suited for controlling multiple stage systems.
Other applications require OUTPUT 1 to be the control output and OUTPUT 2 to be the alarm.

In a multiple stage application, SP1
temperatures, creating a progressive sequence for turning on the outputs (compressors) in
response to a system demand.

The output delays for turning on the compressors (dL1
compressors to be turned on one by one, minimizing energy demand.

Another usage for multiple output controllers is in systems that require automatic selection
between cool and heat action. In these applications, one output is configured as reverse
action (heating) and the other as direct action (refrigeration).

Alarm Functions

There are eight distinct alarm functions implemented in OUTPUT 2 and 3, selected by the
parameter Ac2

Ac2 and ac3

ac3, described below:

Ac2Ac2

ac3ac3

2222

- Low temperature alarm – OUTPUT is turned on when the measured temperature falls
below the respective set point value.

3333

- High temperature alarm – OUTPUT is turned on when the measured temperature
exceeds the respective set point value.

4444

- Inside range alarm – OUTPUT 2 is turned on when the measured temperature is within
the range defined by:

(SP1

SP1 – SP2

SP1SP1

5555

- Outside range alarm: OUTPUT 2 is turned on when the temperature falls outside the
range defined by:

(SP1

SP1 – SP2

SP1SP1

Functions 6666, 7777, 8888 e 9999 are identical to the above ones except that they incorporate the Initial
Blocking feature, which inhibits the output if an alarm condition is present at start-up. The
alarm will be unblocked after the process reaches a non-alarm condition for the first time.

Alarm Timer

Alarms can be configured for timed operation. Three operation modes can be programmed:
alarm delay, alarm timed pulse or alarm oscillator. Alarm temporization is available only for
outputs 2 and 3 and is configured through parameters: “2t1

Table 4 shows these advanced functions. Times T1 and T2 can be programmed from 0 to
1999 seconds. Programming 0 (zero) in the timer parameters T1 and T2 disables the timer
function.

The output status led P2 and P3 in the controller panel, signals when the control output is on.

Advanced

Function

Normal Operation 0 0

Delayed 0 1 to 1999 s

Pulse 1 to 1999 s 0

Oscillator 1 to 1999 s 1 to 1999 s

SP1,,,, SP2

SP2 and SP

SP1SP1

SP2) and (SP1

SP1 + SP2

SP2SP2

SP1SP1

SP2) and (SP1

SP2SP2

T1 T2 ACTION

Table 4 – Timer Alarm Functions 1 and 2

SP3333 are configured to operate at different

SP2SP2

SPSP

dL1, dl2

dl2 and dL

dL1dL1

dl2dl2

SP2) or (SP1

SP1 – SP3

SP1SP1

SP1 – SP3

SP1SP1

2t1”, “3t1

2t12t1

Alarm

Output

Alarm Event

Alarm

Output

Alarm Event

Alarm

Output

Alarm Event

Alarm

Output

Alarm Event

SP3) and (SP1

SP3SP3

SP3) and (SP1

SP3SP3

3t1”, “2t2

3t13t1

T2

T1

T1

SP2SP2

SP1 + SP2

SP2) or (SP1

SP1SP1

SP2SP2

SP1 + SP3

SP1SP1

2t2” and “3t2

2t22t2

dL3333) cause the

dLdL

SP3)

SP3SP3

SP1 + SP3

SP3)

SP1SP1

SP3SP3

3t2”.

3t23t2

T2

T1

CONFIGURATION PROTECTION

A protection system to avoid unwanted changes to the controller parameters is implemented.
The level of protection can be selected from partial to full. The following parameters are part
of the protection system:

Pas

Pas When this parameter is presented, the correct password should be entered to allow

PasPas

changes of parameters in the following levels.

Prt

Prt Defines the level of parameters that will be password protected:

PrtPrt

1 - Only calibration level is protected (factory configuration);
2 - Calibration and Configuration levels are protected;
3 - All levels are protected - calibration, Configuration and setpoints.

PA(

PA( Parameter for definition of a new password. Since it is located in the calibration level,

PA(PA(

can only be changed by a user that knows the current password. Valid passwords are
in the range 1 to 999.

CONFIGURATION PROTECTION USAGE

PAS

PAS parameter is displayed before entering a protected level. If the correct password is

PASPAS

entered, parameters in all following levels can be changed. If wrong or no password is
entered, parameters in the following levels will be read only.

Important notes:

1- After five consecutive attempts to enter a wrong password, new tentative will be blocked

for the next 10 minutes. If the current valid password is unknown, the master password
can be used only to define a new password for the controller.

2 - The password for a brand new device is 111.

ERROR MESSAGES

Sensor measurement errors force the controller outputs to be turned off. The cause for these
errors may have origin in a bad connection, sensor defect (cable or element) or system
temperature outside the sensor working range. The display signs related to measurement
errors are shown below:

Measured temperature exceeded maximum allowed range for the
sensor. Broken Pt100, Pt1000 or T/C. Short circuited NTC sensor.

Measured temperature is below minimum measurement range of the
sensor. Short circuited Pt100, Pt1000 or T/C. Broken NTC.

PRODUCT IDENTIFICATION

The label attached to the controller case identifies the model and the optional present in the
product, as described below:

MODEL: N323 - A - B - C, where:

A: Input Sensor: NTC or Pt100 or Pt1000 or J/K/T (Thermocouples)

B: Digital communication: blank or 485 (RS485, Modbus protocol)

C. Voltage rating: blank (100-240 Vac/dc) or 24V (24 Vac/dc);

TECHNICAL ASSISTANCE

If you encounter a problem with your controller, review the configuration with regard to inputs,
outputs, alarms, etc. If the problem persists, contact your supplier or Novus at
[e-mail].