Novus N321R User Manual download pdf

TEMPERATURE CONTROLLER

N321R

OPERATING MANUAL V1.8x

Man 5001227

The N321R is a controller for cooling applications, with defrost function (forced compressor

shut-down). It accepts NTC, Pt100 and Pt1000 temperature probes, depending on the

product code (the user must observe the measurement range of the selected sensor). The

N321R control output is capable of driving a compressor load of up to 1 HP directly.

The features of a particular model (input sensor type, sensor range, mains supply, etc) are

identified by the label placed on the thermometer body.

SPECIFICATIONS

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

when placing the order):

Thermistor NTC, Type 10 k @ 25 °C; Range: –50 to 120 °C (-58 to 248 ºF);

Accuracy: 0.6 °C;

Sensor interchangeability: 0.75 °C. This error can be compensated by the offset

parameter in the controller.

Pt100; Type: Range: –50 to 300 °C; = 0,00385; 3-wire;

Accuracy: 0.7 °C; IEC-751;

Pt1000; Type: Range: –200 to 530 °C; = 0.00385; 3-wire;

Accuracy: 0.7 °C;

Note: Two 3-meter probe cable are bundled with the instrument. The cable can be extended

up to 200 m.

Measurement Resolution:.............................................................. 0.1 º from –19.9 to 199.9 º

..................................................................................... 1 ºC elsewhere

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

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

POWER SUPPLY: .............................................100 to 240 Vac/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 x 75 mm

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

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

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

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

Relative humidity: ................................................. 20 to 85 % RH

Case Polycarbonate UL94 V-2

Protection: Box IP42, Frontal panel IP65

Suitable wiring: Up to 4.0 mm²

Serial interface not isolated from input circuitry.

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

ELECTRICAL WIRING

Fig. 01 below shows the controller connections to sensor, mains and outputs.

Fig. 01 - N321R terminals

* The serial communication interface is optional.

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.

INSTALATION

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.

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 / Voltage indication

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” message shows up. Pressing

again to go back to level 0.

To access level 2 of parameters, press for 2 seconds until the “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.

Level 1 – Setpoint Adjustment

In this level only the Setpoint (SP) parameters are available, alternating the names with their

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

keys.

Voltage

The screen voltage measurement. For values lower than 150 Vac and

higher than 254 Vac presents the message 0.

Function available only for model N321R-NTC-LVD.

Set Point

Temperature adjustment for control OUTPUT 1. SP value is limited to the

values programmed in SPL and 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

Temperature Unit. Selects display indication for degrees Celsius or

Fahrenheit.

0 Temperature in degrees Celsius. (factory default)

1 Temperature in degrees Fahrenheit.

ofs

Sensor Offset - Offset value to be added to the measured temperature to

compensate sensor error.

spl

SP Low Limit - Lower range for SP. SPL must be programmed with a

lower value than spK.

spK

SP High Limit - Upper range for SP. SPx must be greater than spl.

kys

Histeresis

OUTPUT 1 Hysteresis: Defines the differential range between the OUTPUT

1 temperature value at which it is turned off. In degrees.

oft

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. This parameter is intended for refrigeration systems where longer

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

ont

On time - Defines the minimum on time for control OUTPUT 1. Once turned

on, OUTPUT 1 remains so for at least the time programmed in ont. For

thermocouple inputs this parameter is not available. This parameter is

intended for refrigeration systems where increased compressor life is desired.

For heating systems, program ont to zero. Value in seconds, 0 to 999 s.

dly

Delay

Delay time to start control. Upon power-on, control OUTPUT 1 is kept off

until the time programmed in 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.

dib

Defrost

Interval Base

Time base for dfi:

0 Seconds 1 Minutes 2 Hours

dtb

Defrost Time

Base

Time base for dft:

0 Seconds 1 Minutes 2 Hours

dfi

Defrost

interval

Interval between defrost cycles. Can be selected 0 to 999 seconds/

minutes/hours, according the value specified at dib.

Dft

Defrost time

Defrost duration. Can be 1 to 999 seconds / minutes / hours, according the

value specified at dtb.

dfh

Defrost hold

Hold the temperature indication throughout the defrost interval or the time

defined by this parameter.

0 Do not hold the indication during the defrost;

1 to 250 Time (seconds / minutes / hours) besides the defrost time the

indication will remain held.

1 2

Summary of Contents

Page 1 - OPERATION

TEMPERATURE CONTROLLER N321R OPERATING MANUAL V1.8x Man 5001227 The N321R is a controller for cooling applications, with defrost function (forced

Page 2

(pe Compressor Protect Enables compressor protection by voltage monitoring. If the network voltage is not between the SetPoints (PL and (PK. 0 Disabl

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