Novus N321 User Manual download pdf

TEMPERATURE CONTROLLER

N321

OPERATING MANUAL - V1.8x

Man 5001222

The N321 is a temperature 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 output 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.

SPECIFICATIONS

INPUT SENSOR: The input sensor type can be chosen form the 4 options below

(specified when placing the order):

 NTC Thermistor, 10 k @ 25 ºC; range: –50 to 120 ºC (-58 to 248 ºF);

Accuracy: 1.0 ºC (1.1 °F), with original sensor;

Sensor interchangeability: 1 ºC (1.35 ºF). This error can be compensated by the

offset parameter in the controller.

 Pt100 (= 385); Range: –50 to 300 ºC (-58 to 572 ºF);

Accuracy: 0.7 ºC (1.3 ºF); IEC-751.

 Pt1000 (= 385); Range: –200 to 530 ºC (-328 to 986 ºF); Accuracy: 0,7 ºC (1.3 ºF);

 J, K or T thermocouple (IEC-584):

 Type J: Range: 0 to 600 ºC (32 to 1112 ºF); Accuracy: 3 ºC (5.4 ºF);

 Type K: Range: -50 to 1000 ºC (-58 to 1832 ºF); Accuracy: 3 ºC (5.4 ºF);

 Type T: Range: -50 to 400 ºC (-58 to 752 ºF); Accuracy: 3 ºC (5.4 ºF);

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 –19.9º to 199.9º display units with NTC, Pt100 and Pt1000: ...................... 0.1

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

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

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

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

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.

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

Fig. 1 – N321 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

Temperature measurement

Setpoint Adjustment

Configuration

Calibration

Upon power-up, the N321 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” message shows up.

Pressing again to go back to level 0.

To access level 2 of paramenters, 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 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 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) parameter is available, alternating the name

with its respective value. Adjust the desired temperature for setpoint by clicking on

the and

keys.

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

1 - Temperature in degrees Fahrenheit

typ

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.

0 - Thermocouple type J

1 - Thermocouple type K

2 - Thermocouple type T

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.

ky1

OUTPUT 1 Hysteresis: defines the differential range between the

temperature value at which the OUTPUT 1 is turned on and the

value at which it is turned off. In degrees.

Act

Control action for OUTPUT 1 :

0 Reverse: For heating applications. Outputs turn on when

temperature is lower than SP.

1 Direct: For cooling applications. Output turns on when

temperature is above SP.

oft

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. For thermocouple inputs this parameter is not

available. This parameter is intended for refrigeration systems

where longer compressor life is desired. For heating systems,

program oft to zero. Value in seconds, 0 to 999 s.

ont

on time

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

Delay1

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 simultaneouly

after the turn-on of a system with several controllers. Value in

seconds, 0 to 250 s.

Add

Address

Adress - Controllers with the optional RS485 Modbus RTU

communication interface have the Add parameter at the

Configuration level. Set a unique Modbus address for each

equipment connected to the network. Address range is from 1 to 247.

1 2

Summary of Contents

Page 1 - OPERATION

TEMPERATURE CONTROLLER N321 OPERATING MANUAL - V1.8x Man 5001222 The N321 is a temperature controller for heating and cooling applications

Page 2 - KEYBOARD

Level 3 – Calibration level The controller is factory calibrated. The following parameters should be accessed only by experienced personnel. To e

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Novus N321 User Manual

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