NOVUS N323 TEMPERATURE CONTROLLER, Electronic Thermostats User Manual

NOVUS N323 TEMPERATURE CONTROLLER, Electronic Thermostats

INTRODUCTION

The N323 is a 3-output digital electronic controller for heating and cooling applications. It is available with an NTC thermistor input sensor, Pt100, 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 are identified by the label placed on the controller body.

SPECIFICATIONS

INPUT SENSOR: The sensor is chosen by the user at the time of purchase and is presented on the upper side of the equipment box. The options are:

•  Thermistor NTC, 10 kΩ @ 25 °C;
• Range: -50 to 120 °C (-58 to 248 °F);
• Accuracy: 0.6 °C (1.1 °F);

The maximum error in the interchangeability of original NTC sensors: is 0.75 °C (1.35 °F). This error can be eliminated through the offset parameter of the equipment.

Note: For the NTC thermistor option, the sensor comes with the equipment. Its operating range is limited to -30 to +105 °C (-222 to +221 °F). It has a cable of 3 meters in length, 2 x 0.5 mm², and can be extended up to 200 meters.

Pt100; Range: -50 to 300 °C (-58 to 572 °F); α= 0.00385; 3 wires;
Accuracy: 0.7 °C (1.3 °F); according to IEC-751 standards;

• Thermocouple type J; Range: 0 to 600 °C (32 to 1112 °F); Accuracy: 3 °C (5.4 °F);
• Thermocouple type K; Range -50 to 1000 °C (-58 to 248 °F); Accuracy: 3 °C (5.4 °F);
• Thermocouple type T; Range: -50 to 400 °C (-58 to 248 °F); Accuracy: 3 °C (5.4 °F);
• Thermocouples according to IEC-584 standards

Measurement resolution: …………………………………………………………………. 0.1° from -19.9 to 199.9°

…………………………………………………………………………….. 1° elsewhere

Note: The equipment keeps its precision all over the range, despite the lack of display resolution in a part of the range does not allow its visualization.

• OUTPUT1: …………………………………… Relay SPDT; 1 HP 250 Vac / 1/3 HP 125 Vac (16 A Res.)
• OUTPUT2: ………………………………………………………………………… Relay: 3 A / 250 Vac, SPST-NA
• OUTPUT3: ………………………………………………………………………… Relay: 3 A / 250 Vac, SPST-NA
• POWER SUPPLY: Tension: …………………………….100~240 Vac/dc (± 10 %)
• Optionally …………………………………. 24 V (12~30 Vdc/ac)
• Mains frequency: ………………………………………. 50~60 Hz
• Power consumption: ………………………………………….5 VA
• DIMENSIONS: Width x Height x Depth: ………………………………………. 75 x 33 x 75 mm
• Panel cut-out: ……………………………………………………………. 70 x 29 mm
• Weight: ………………………………………………………………………………. 100 g

ENVIRONMENTAL CONDITIONS:

• Operating temperature: ………….0 to 40 °C (32 to 104 °F)
• Storage temperature: …………….. -20 to 60 °C (-4 to 140 °F)
• Relative humidity: ……………………………………. 20 to 85 % RH

1. Suitable wiring: Up to 4.0 mm².
2. Case: Polycarbonate UL94 V-2;
3. Protection: box: IP42, front panel: IP65
4. RS-485 digital communication; RTU MODBUS protocol (optional)
5. Serial interface not isolated from input circuitry.
6. Serial interface isolated from input circuitry, except in 24 V powered model.

ELECTRICAL WIRING

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

The serial communication feature is not always present in the controller. 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.

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, contractors, etc.
• Installing RC filters (47 R and 100 nF, series combination) is strongly recommended at contactor coils or any other inductors.

OPERATION

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

Upon power-up, the controller 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 parameter level 0 (temperature measurement level).

To access level 1, press for 1 second until the “SP1” message shows up. Pressing again, the “SP2” parameter is presented. Pressing again, the “SP2” parameter is presented. To go back to level 0, press once more. 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 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:

•  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.
•  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.

SP1| SetPoint 1, 2 and 3. Temperature adjustment for control OUTPUT. SP value is limited to the values programmed in SPL and SPk in the programming level (Parameter configuration, level 2).
---|---
Sp2
Sp3

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..

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

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Unt| Temperature Unit – Selects display indication for degrees Celsius or Fahrenheit.

0 Temperature in degrees Celsius

1 Temperature in degrees Fahrenheit

0fs| Sensor Offset – Offset value to be added to the measured temperature to compensate sensor error.
spl| SP Low Limit – Lower range for SP1 and SP2. SPL must be programmed with a lower value than spK.
spK| SP High Limit – Upper range for SP1 and SP2. SPx must be greater than

spl.

ky1 ky2

Ky3

| 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.
A(1| 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.

A(2| Action 2 – Control OUTPUT 2 and OUTPUT3 action or Alarm functions:

0 Reverse control action (heating).

1 Direct control action (cooling).

2 Low (minimum) temperature alarm.

3 High (maximum) temperature alarm.

4 Alarm for temperature inside the range

5 Alarm for temperature outside the range.

6 Low temperature alarm with initial blocking.

7 High temperature alarm with initial blocking.

8 Inside range alarm with initial blocking.

9 Outside range alarm with initial blocking.

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

A(3
(nt| Control – Inversion between Setpoints and Outputs.

0 SP1 is assigned to OUTPUT 1 and SP2 to OUTPUT 2 (factory setting).

1 SP1 is assigned to OUTPUT 2 where as SP2 is directed to OUTPUT 1.

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dl1 Dl2 Dl3| 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 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.
0f1 0f2

0f3

| 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 0f1. 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 0f1 to zero. Value in seconds, 0 to 999 s.
0n1

0n2 0n3

| 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 0n1. 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 0n1 to zero. Value in seconds, 0 to 999 s.
2t1 3t1

Timer T1

| 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.
2t2 3t2

Timer T2

| 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.
Adr| Address – Controllers with the optional RS485 Modbus RTU communication interface have the Adr parameter at the Configuration level. Set a unique Modbus address for each equipment connected to the network. Address range is from 1 to 247.

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 3 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| Password – Enter the correct password to unlock write operations for the parameters in the following levels.
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[Al| Calibration low – Offset value of the input. It adjusts the lower measurement range of the sensor.
[Ak| Calibration High – Gain calibration. It adjusts the upper measurement range of the sensor.
[JL| Cold Junction Offset calibration – This parameter is available only for thermocouple.
FA(| Factory Calibration – Restores factory calibration parameters. Change from

0 to 1 to restore the calibration parameters with factory values.

Prt| Protection – Defines the levels of parameters that will be password protected. See “Configuration Protection” for details.
Pa(| Password Change – Allows changing the current password to a new one. Values from 1 to 999 are allowed.
Sn2| Serial number – First part of the controller electronic serial number.
sn1| Serial number – Second part of the controller electronic serial number.
sn0| Serial number – Third part of the controller electronic serial number.

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, SP2 and SP3 are configured to operate at different temperatures, creating a progressive sequence for turning on the outputs (compressors) inresponse to a system demand. The output delays for turning on the compressors (dL1, dl2 and dL3) cause th 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 revers action (heating) and the other as direct action (refrigeration).

Alarm Functions

1. There are eight distinct alarm functions implemented in OUTPUT 2 and 3, selected by the parameter A(2 and a(3, described below:
2.  Low-temperature alarm – OUTPUT is turned on when the measured temperature falls below the respective set point value.
3.  High-temperature alarm – OUTPUT is turned on when the measured temperature exceeds the respective set point value.
4.  Inside range alarm – OUTPUT 2 is turned on when the measured temperature is within the range defined by: (SP1 – SP2) and (SP1 + SP2) or (SP1 – SP3) and (SP1 + SP3)
5.  Outside range alarm: OUTPUT 2 is turned on when the temperature falls outside the range defined by:(SP1 – SP2) and (SP1 + SP2) or (SP1 – SP3) and (SP1 + SP3) Functions 6, 7, 8 e 9 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”, “3t1”, “2t2” and “3t2”. 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

0

|

0

| Alarm Output

Alarm Event

Delayed

|

0

|

1 to 1999 s

| Alarm

Output              T2

Alarm Event

Pulse

|

1 to 1999 s

|

0

| Alarm

Output              T1

Alarm Event

Oscillator

|

1 to 1999 s

|

1 to 1999 s

| Alarm

Output            T1             T2             T1

Alarm Event

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 When this parameter is presented, the correct password should be entered to allow changes of parameters in the following levels. Prt Defines the level of parameters that will be password protected:

•  Only calibration level is protected (factory configuration);
•  Calibration and configuration levels are protected;
•  All levels are protected – calibration, configuration and SP.

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

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

•  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 passwordcan be used only to define a new password for the controller.
• – 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 ] + [ higher digit of SN0 ]  for example the master password for the device with serial number 97123 465 is: 1 9 3 6 as follows: 1 + sn2= 97; sn1= 123; sn0= 465 = 1 9 3 6

How to use the master password:

1. Enter the master password value at PaS prompt.
2. Go to PA( parameter and enter the new password, which must not be zero (0).
3.  Use this new password.

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 or T/C. Short circuited NTC sensor.

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 | ·      Measured temperature is below minimum measurement range of the sensor.

·      Short circuited Pt100 or T/C. Broken NTC.

WARRANTY
Warranty conditions are available on our website www.novusautomation.com/warranty

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