NOVUS N323R User Manual

N323r, Specifications, Installation

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TEMPERATURE CONTROLLER

N323R

OPERATING MANUAL V1.7x

Man 5001283

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 k

Ω

@ 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 not isolated from input circuitry.

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

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.

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

Temperature measurement

Setpoint Adjustment

Configuration

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

SP” message shows up. Pressing

again to go back to level 0.

To access level 2 of paramenters, press

for 2 seconds until the “uNT

uNT

uNT” message is

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

advance to 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.

3. While in the temperature measurement level, a momentary pressing on

the

key will show the Probe 2 temperature (evaporator temperature)

Level 1 – Setpoint Adjustment

In this level only the Setpoint (SP

SP) parameters are available, alternating the names with

their respective values. Adjust the desired temperature for each setpoint clicking on the

and

keys.

Set Point

Case of coldroom temperate adjustment. SP

SP value is limited to the

values programmed in SPL

SPL

SPL and SPk

SPk

SPk in the programming level

(Parameter configuration, level 2).

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

Unit

Temperature Unit. Selects display indication for degrees Celsius or
Fahrenheit

0 Temperature Celsius. (factory default)
1

1 Temperature in degrees Fahrenheit.

Of1

Offset
Probe 1

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.

Of2

Offset
sensor 2

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.

Spl

SP Low Limit

SP Low Limit - Lower range for SP

SP. SPL

SPL

SPL must be programmed with a

lower value than spK

spK

spK.

spK

SP High Limit

SP High Limit - Upper range for SP

SP. S

SPx

Px must be greater than spl

spl

spl.

Kys

Histeresis

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.

(nt

Control

Defines the output position for the refrigeration relay.

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

Refrigeration at OUTPUT2 / Defrost at OUTPUT1.

Dly

Delay

Delay time to start control. Upon power-on, control OUTPUT 1 is kept off
until the time programmed in dly

dly

dly is elapsed. Its usage is intended to

prevent multiple compressors to start simultaneously after the turn-on of
a system with several controllers. Value in seconds, 0 to 250 s.

0nt

on time

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

ont. This parameter is intended for refrigeration systems where
increased compressor life is desired. Value in seconds, 0 to 999 s.

0ft

Off time

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

oft. This parameter is intended for refrigeration systems where

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

df1

Defrost
Interval

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

df1= 0

disables this function (no defrost cycles)

Dft

Defrost time

Defrost duration. Interval time during which the defrost output remains
on.
Value in minutes, 1 to 999.

df(

defrost
Compressor

Compressor output behavior during the defrost cycle:

Always off;

Always on ;

Compressor output works normally, turning on and off to maintain
the temperature.

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