NOVUS N323R User Manual

TEMPERATURE CONTROLLER

N323R

OPERATING MANUAL V1.7x

The N323R is a Refrigeration controller designed to control the temperature of
refrigeration cases and coldrooms, embedding several specialized functions for best
system performance. The N323R can read two temperature probes (controller and
defrost probes) and has three relay outputs for controlling the compressor, the defrost
and the fan.

The controller can be ordered with optional features such as to comply with the
application’s requirements. The label on the instrument housing shows the complete
instrument configuration.

SPECIFICATIONS

PROBE INPUT:....................................................................................... 2 Thermistor NTC

............................................................................................................Type 10 kΩΩΩΩ @ 25 °C

...................................................................................Range: –50 to 120 °C (-58 to 248°F)

...................................................................................................................Accuracy: 0,6 °C

Two 3-meter probe cable are bundled with the instrument. The cable can be
extended up to 200 m. Sensor interchangeability: 0,75 °C. This error can be
compensated by the offset parameter in the controller.

Measurement Resolution:.....................................................0,1 °C from –19.9º to 199.9º

.....................................................................................................................1 °C elsewhere

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

................................................Optionally: Pulse, 5 Vdc, 25 mA max.

OUTPUT2:........ Relay SPST-NA, 3 A / 250 Vac (General use) ; 5A / 250Vac (Resistive)

OUTPUT3:...................SPST-NA, 3 A / 250 Vac (General use) ; 5A / 250Vac (Resistive)

POWER SUPPLY: .................................100 to 240 Vca/dc ±10 %

Optionally: .....................................12 to 30 Vdc

Mains frequency:................................50~60 Hz

Power consumption: ................................. 5 VA

Dimensions: Width x Height x Depth: ................................... 75 x 33 x75 mm

Weight: .............................................................................100 g

Panel cut-out: ..........................................................70 x 29 mm

ENVIRONMENT:....................................Operating temperature: 0 to 40 ºC (32 to 122 ºF)

.................................................................Storage temperature: -20 to 60 ºC (-4 to 140 ºF)

....................................................................Relative humidity: 20 to 85 % non-condensing

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

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

DIGITAL COMMUNICATION:........................RS-485, RTU MODBUS protocol (optional)

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

Serial interface not isolated from input circuitry.

INSTALLATION

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 inductor.

•

Use protection devices like circuit breakers and fuses.

Man 5001283

ELECTRICAL WIRING

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

Figure 1 – N323R terminals

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 N323R 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 “SP

again to go back to level 0.

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 that 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

Level 1 – Setpoint Adjustment

In this level only the Setpoint (SP
their respective values. Adjust the desired temperature for each setpoint clicking on the

and keys.

SP

SP

SPSP

Set Point

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

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

saves the current parameter value and returns to the measurement
level.

3. While in the temperature measurement level, a momentary pressing on
the key will show the Probe 2 temperature (evaporator temperature)

SP) parameters are available, alternating the names with

SPSP

Case of coldroom temperate adjustment. SP
values programmed in SPL
(Parameter configuration, level 2).

SPL and SPk

SPLSPL

SP” message shows up. Pressing

SPSP

uNT” message is

uNTuNT

SP value is limited to the

SPSP

SPk in the programming level

SPk SPk

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

Unit

Of1

Of1

Of1Of1

Offset
Probe 1

Of2

Of2

Of2Of2

Offset
sensor 2

Spl

Spl

SplSpl

SP Low Limit

spK

spK

spKspK

SP High Limit

Kys

Kys

KysKys

Histeresis

(nt

(nt

(nt(nt

Control

Dly

Dly

DlyDly

Delay

0nt

0nt

0nt0nt

on time

0ft

0ft

0ft0ft

Off time

df1

df1

df1df1

Defrost
Interval

Dft

Dft

DftDft

Defrost time

df(

df(

df(df(

defrost
Compressor

Temperature Unit. Selects display indication for degrees Celsius or
Fahrenheit

0000 Temperature Celsius. (factory default)
1111 Temperature in degrees Fahrenheit.

Probe 1 Offset - Offset value to be added to the sensor 1 measured
temperature such as to perform fine adjustments to the value showed on
the display (after sensor replacement, for instance, if required).

Range: ± 0.1 to 10.0 degrees.

Probe 2 Offset - Offset value to be added to the sensor 2 measured
temperature to perform fine adjustments to the value showed on the
display (after sensor replacement, for instance, if required).

Range: ± 0.1 to 10.0 degrees.

SP Low Limit - Lower range for SP
lower value than spK

SP High Limit - Upper range for SP

OUTPUT 1 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.

Defines the output position for the refrigeration relay.

0

0 Refrigeration at OUTPUT1 / Defrost at OUTPUT2. (factory default)

00
1

1 Refrigeration at OUTPUT2 / Defrost at OUTPUT1.

11

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

On time - Defines the minimum on time for refrigeration output. Once
turned on, OUTPUT 1 remains so for at least the time programmed in

ont

ont. This parameter is intended for refrigeration systems where

ontont

increased compressor life is desired. Value in seconds, 0 to 999 s.

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

oft. This parameter is intended for refrigeration systems where

oftoft

longer compressor life is desired. Value in seconds, 0 to 999 s.

Interval time between defrost cycles. Adjustable from 0 to 999s.
During this time, the defrost output remains off.

df1= 0

df1= 0

df1= 0df1= 0

Defrost duration. Interval time during which the defrost output remains

on.
Value in minutes, 1 to 999.

Compressor output behavior during the defrost cycle:

0

0 Always off;

00
1

1 Always on ;

11
2

2 Compressor output works normally, turning on and off to maintain

22

spK.

spKspK

disables this function (no defrost cycles)

the temperature.

SP. SPL

SPL must be programmed with a

SPSP

SPL SPL

SP. SSSSPx

Px must be greater than spl

SPSP

Px Px

dly is elapsed. Its usage is intended to

dlydly

spl.

splspl

Dfs

Dfs

DfsDfs

ddt

ddt

ddtddt

frs

frs

frsfrs

fdl

fdl

fdlfdl

foc

foc

focfoc

fod

fod

fodfod

fss

fss

fssfss

Co

Coeeee

CoCo

Dfh

Dfh

DfhDfh

defrost hold

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.

Temperature for finalizing the defrost clycle – evaporator

temperature value as measured by sensor 2 which terminates the
defrost cycle, regardless of the time configured in Dft

Range:–50 to +120 degrees (-58 to 248°F).
NOTE: the defrost cycle will not initiate if the evaporator temperature is

the value defined in this parameter.

Drain down time – This parameter sets the time interval for keeping the
outputs off to allow optimum drying of the evaporator.

Value in minutes, 0 to 999.

Evaporator temperature for liberating the fan – after defrost and
water draining, the refrigeration is turned on. To keep warm air from
circulating in the system, demanding more energy to lower the
temperature, the N323R can be configured to maintain the fan output
off until the temperature cools below the value defined in frs

Range: : –50 to 120 °C (-58 to 248°F)

Fan maximum delay after draining – to assure product integrity, the
fan output will be unconditionally turned on after the time programmed
in fdl

fdl, regardless of the fact that the evaporator temperature may not

fdlfdl

have reached the temperature value defined in frs

Value in minutes, 0 to 999.

Fan behavior during refrigeration .

0000 Fan is active only when the compressor is on..

1111 Fan is active during the complete refrigeration cycle, even when the

compressor is turned off.

Fan behavior during defrost.

0

0 Fan is off during the defrost cycle.

00
1

1 Fan is active during the defrost cycle.

11

Fan deactivation due to evaporator heating – evaporator temperature
that turns the Fan off when the evaporator heats up (above temperature
defined in fss
compressor. The fan is allowed to turn on again when the temperature
drops 2 degrees below the value defined in this parameter.

Compressor function during a probe failure: This parameter fixes the
compressor operating mode in the event of the main probe failure.

0

0 Compressor is deactivated when probe 1 is in error.

00

1

1 Compressor is activated when probe 1 is in error

11

Defrost hold time (temperature indication hold): This is the time
interval following the end of the defrost cycle for the controller to display
actual control temperature. During the defrost cycle and the time defined
by dfh
to the start of the defrost cycle.

0000 : function disabled (shows actual temperature during the

1 to 250 : Time interval (sec., min. or hours) after the end of defrost for

fss), improving system efficiency and protecting the

fssfss

dfh, the display will be showing the last measured temperature prior

dfhdfh

defrost cycle);

the display to show the actual control temperature.

Dft.

DftDft

frs

frsfrs

frs.

frsfrs

Pas

Pas

PasPas

[l1

[l1

[l1[l1

[k1

[k1

[k1[k1

[l2

[l2

[l2[l2

[k2

[k2

[k2[k2

FA(

FA(

FA(FA(

Prt

Prt

PrtPrt

Pa(

Pa(

Pa(Pa(

Sn2

Sn2

Sn2Sn2
sn1

sn1

sn1sn1
sn0

sn0

sn0sn0

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

Calibration low input 1 – Zero value of the input 1. It adjusts the
lower measurement range of Probe 1.

Calibration High input 1 – Gain calibration. It adjusts the full scale
measurement range of the Probe 1.

Calibration low input 2 – Zero value of the input 2. It adjusts the
lower measurement range of of Probe 2.

Calibration High input 2 – Gain calibration. It adjusts the full scale
measurement range of the Probe 2.

Factory Calibration – Restores factory calibration parameters. The
value 1 restores the calibration parameters to the factory values.

Protection – Defines the levels of parameters that will be password
protected. See “Configuration Protection Usage” for details.

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

Serial number - First part of the instrument serial number.

Serial number - Second part of the instrument serial number.

Serial number - Third part of the instrument serial number.

CONTROLLER OPERATION

The controller turns on and off the compressor output such as to maintain the
temperature at the selected Setpoint. The front panel display shows the symbol
whenever the compressor is active.

Defrost

Function to eliminate the ice accumulated on the evaporator, for improving system
efficiency. The duration and interval of the defrost cycles are user configurable.
However, it may be unconditionally terminated depending on the evaporator
temperature as measured by Probe 2 (refer to the dfs

The defrost can be achieved by: 1) compressor deactivation; 2) electrical heater or

3) heat pump inversion.

In the first case, the refrigeration is turned off and the defrost happens naturally. In the
second case the defrost output drives an electrical resistance to generate heat and so
melt the ice. In this mode, the compressor output is also deactivated. In the third case,
heat pump inversion, the compressor is kept active and the defrost output commands
the valve that inverts the heat cycle.

During defrost, the case of coldroom temperature may be forced to reflect the last
temperature measured prior to entering the defrost cycle (refer to the dfh

The df1

df1 and dft

dft parameters define, respectively, the time interval between defrosts

df1df1

and the duration of the defrost cycle. The controller display shows the symbol to
indicate that a defrost cycle is in progress.

Manual defrost: The key allows that a defrost cycle be initiated of terminated
immediately. Pressing this key for 3 seconds will toggle the current defrost status.

Definition of the evaporator temperature that terminates the defrost. (dfs
parameter)

- Wait for ice building on the evaporator;

- Start a defrost cycle manually;

- Visually monitor the evaporator until there is no more ice on it.

- Check the Probe 2 temperature (momentary press on the key). This is the

correct temperature setting for the dfs

dftdft

dfs.parameter.

dfsdfs

dfs parameter)

dfsdfs

dfh parameter).

dfhdfh

dfs

dfsdfs

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 must be entered to

PasPas

allow 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

PA(PA(

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

CONFIGURATION PROTECTION USAGE

The PAS

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

PASPAS

password is 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.

MASTER PASSWORD

The master password allows user to define a new password for the controller, even if
the current password is unknown. The master password is based in the serial number
of the controller, and calculated as following:

[ 1 ] + [ higher digit of SN2 ] + [ higher digit of SN1 ] + [ highe r digit of SN0 ]
for example the master password for the device with serial number 987123 465 is: 1 9 3 6

as follows: 1 + sn2

How to use the master password:

1- Enter the master password value at PaS
2- Go to PA(
3- Now you can use this new password to access all controller parameters with modify

rights.

sn2= 987; sn1

sn2sn2

PA( parameter and enter the new password, which must not be zero (0).

PA(PA(

sn1= 123; sn0

sn1sn1

sn0= 465 = 1 9 3 6

sn0sn0

PaS prompt.

PaSPaS

ERROR MESSAGES

Probe 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: N323R - A - B - C, where:

A: Input Sensor: NTC
B: Digital communication: blank or 485 (RS485, Modbus protocol)
C. Voltage rating: blank (100-240 Vac/dc) or 24V (10-30 Vac/dc);