NOVUS N321 Cooling and Heating Temperature Controller User Guide

NOVUS N321 Cooling and Heating Temperature Controller

Product Information

• Product Name: N321, N322, N323
• Manufacturer: NOVUS AUTOMATION
• Safety Alerts: The manual contains important safety information and precautions that must be followed to ensure personal safety and prevent damage to the device.

Specifications

• Protection Index: Housing
• IP42, Front
• IP65
• Certifications: CE, UKCA, UL

RS485 Interface:
The RS485 interface is not electrically isolated from the input circuit. In 24V power supply models (12~24 Vdc), it is also not isolated from the power supply circuit. However, in models with a 100~240 Vac/dc power supply, it is electrically isolated from the supply circuit.

Product Usage Instructions

Electrical Connections

• N321 Model: Refer to the figures in the manual for the connection terminals of the N321 sensor, power supply, and output.
• N322 Model: Refer to the figures in the manual for the connection terminals of the N322 sensor, power supply, and output. Note that the serial communication feature may not always be available in N322.
• N323 Model: Refer to the figures in the manual for the connection terminals of the N323 sensor, power supply, and output. Note that the serial communication feature may not always be available in N323.
• For all models (N321, N322, N323), when using a 2-wire connection for Pt100, terminals 11 and 13 must be interconnected. Also, ensure that all conductors have the same electrical resistance (cross-section) for proper cable resistance compensation.

Installation Recommendations:

• The manual provides installation recommendations that should be followed for proper installation of the device.

Operation:

• Configuration : Before using the controller, it needs to be configured. Configuration involves setting values for parameters that determine the device’s operation.
• Parameter Levels : The configuration parameters are organized into different levels called Parameter Levels.
• Level 0:  Temperature measurement.
• Level 1: Setpoint adjustment
• Level 2: Operation mode.
• Level 3: Calibration.
• Accessing Parameter Levels: To access a specific parameter level, follow these steps:
  • Level 1: Press the key for 1 second until SP1 parameter appears. Press again to return to the temperature measurement level.
  • Level 2: Press the key for 2 seconds until VNT parameter appears. Release the key to remain at this level. Press again to access other parameters of this level. After the last parameter, the controller returns to the temperature measurement level.
• Changing Parameter Values: To change parameter values, use the and keys until you get the desired values.
  Note: The manual may contain additional notes and information from NOVUS AUTOMATION.

SAFETY ALERTS

The symbols below are used in the device and throughout this manual to draw the user’s attention to valuable information related to device safety and use.

|
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CAUTION: Read the manual fully before installing and operating the device.| CAUTION OR HAZARD: Risk of electric shock.

All safety recommendations appearing in this manual must be followed to ensure personal safety and prevent damage to the instrument or system. If the instrument is used in a manner other than that specified in this manual, the device’s safety protections may not be effective.

INTRODUCTION

N321, N322, and N323 are temperature controllers for heating and cooling. They are distinguished by the number of outputs available:

• N321: It has 1 output channel: OUT1.
• N322: It has 2 output channels: OUT1 and OUT2.
• N323: It has 3 output channels: OUT1, OUT2, and OUT3.

The models are subdivided by the type of temperature sensor supported:

• NTC: Model accepting only the NTC sensor.
• Pt100: Model accepting only the Pt100 sensor.
• J/K/T: Model accepting only J, K and T sensors.

The features of each controller are in accordance with the purchase order and are shown on the label attached to the body of the controller itself.
Example of the label of an N323 model:

These models may have differences in power supply and the availability of an RS485 communication channel.

SPECIFICATIONS

Sensor Input: The choice of sensor is made at the time of purchase and shown on the controller identification label. There are three options:

NTC Input:

• Type: ………… NTC Thermistor, 10 kΩ @ 25 °C; β25/85 = 3435 K; 1 %
• Measurement range: ………………………… -50 to 120 °C (-58 to 248 °F)
• Measurement accuracy: ……. 0.6 °C/F between -19.9 and 99.9 °C/F
• ………………………………………………………………….. 1 °C/F elsewhere

Pt100 Input:

• Type: ………………………………………………………………….. Pt100, α = 385
• Measurement range: ………………………… -50 to 300 °C (-58 to 572 °F)
• Measurement accuracy: …………………… 0.2 % F.S. ± 2 °C @ 25 °C

J/K/T Input:

• Measurement range J: ………………………….. 0 to 600 °C (32 to 999 °F)
• Measurement range K: ………………………. -50 to 999 °C (32 to 999 °F)
• Measurement range T: ………………………. -50 to 400 °C (32 to 752 °F)
• Measurement accuracy: ……………………. 0.2 % F.S. ± 2 °C @ 25 °C

Notes:

1. All input types are factory calibrated.
2. The thermocouples follow the NBR 12771/99 standard.
3. The Pt100 follow the NBR 13773/97 standard.
4. The operating range of the NTC sensor cable, which may come with the controller, is limited to -30 to 105 °C (-22 to 221 °F).
   Its typical length is 3 meters. It can be extended up to 100 meters. It is composed of 2 wires of 0.5 mm² section.
   The maximum error in the interchangeability of original NTC sensors is 0.75 °C. This error can be eliminated using the Offset parameter.

• Measurement resolution: ………….. 0.1° in the range -19.9 to 199.9°
• …………………………………………………………………………….. 1° elsewhere
• OUT1: ……………………………….. SPDT Relay: 1 HP 250 Vac / 30 Vdc /
• ………………………………………………………… 1/3 HP 125 Vac (16 A Res.)
• OUT2: …………………………….. SPST-NO Relay: 3 A / 250 Vac / 30 Vdc
• OUT3: …………………………….. SPST-NO Relay: 3 A / 250 Vac / 30 Vdc

Power supply:

• Voltage: …………………………….. 100 to 240 Vac/dc (± 10 %)
• Frequency: ………………………………………………….. 50~60 Hz
• Consumption: ……………………………………………………… 5 VA
• Optionally: ……………………………….. 24 V (12~30 Vdc/ac) (*)

(*) Note: Models with a 24 V power supply do not have electrical isolation between the power supply, input, and RS485 communication circuits.
In direct current (Vdc) supply networks, you must observe the polarity of the connection.

Dimensions:

• Width x height x depth: ………………………… 75 x 33 x 75 mm
• Panel cut-out: ……………………………………………. 70 x 29 mm
• Weight: ……………………………………………………………. 100 g
• Operation conditions:
• Operation temperature: ……………..0 to 40 °C (32 a 104 °F)
• Storage temperature: …………….. -20 to 60 °C (-4 a 140 °F)
• Relative humidity: ………………………………….. 20 to 85 % RH
• Connections for wires up to 4.0 mm².
• Housing: Polycarbonate UL94 V-2.
• Protection index: Housing: IP42 | Front: IP65.
• Certifications: CE, UKCA, UL.

The RS485 interface (when available on the controller) is NOT electrically isolated from the input circuit.
It is also NOT isolated from the power supply circuit in 24V power supply models (12~24 Vdc).
It is electrically isolated from the supply circuit in models with a 100~240 Vac/dc power supply.

ELECTRICAL CONNECTIONS

N321 MODEL
The figures below show the connection terminals for the N321 sensor, power supply, and output:

For Pt100, you must use a 3-wire Pt100 sensor, as shown in Figure 3. To use a 2-wire Pt100, use the connections shown in Figure 4. In it, terminals 11 and 13 of the controller are interconnected.
To compensate the Pt100 sensor cables properly, the conductors must all have the same electrical resistance (cross-section).

N322 MODEL
The figures below show the connection terminals for the N322 sensor, power supply, and output:

• The serial communication feature is not always available in N322.
  Pt100 3-wire. For 2-wire connection, terminals 11 and 13 must be interconnected. For proper cable resistance compensation, the conductors must all have the same electrical resistance (cross-section).

N323 MODEL
The figures below show the connection terminals for the N323 sensor, power supply, and output:

• The serial communication feature is not always available in N323.
  Pt100 3-wire. For 2-wire connection, terminals 11 and 13 must be interconnected. For proper cable resistance compensation, the conductors must all have the same electrical resistance (cross-section).

INSTALLATION RECOMMENDATIONS

• Input signal conductors should run through the plant separate from output and supply conductors. If possible, in grounded conduits.
• The power supply for the electronic instruments must come from a network dedicated to the instrumentation.
• It is recommended to use RC FILTERS (noise suppressor) in contactor coils, solenoids, etc.
• In control applications, it is essential to consider what can happen when any part of the system fails. The controller internal devices do not guarantee full protection.

OPERATION

Before use, the controller must be configured. To configure it, you must set values for the parameters that determine how the equipment operates.
These configuration parameters are organized in groups or Levels, called Parameter Levels.

Table 1 – Parameter levels
When you turn on the controller, the display shows the version of the equipment for 1 second. This information is important for eventual consultations with the manufacturer. Then, the controller starts presenting the temperature value measured by the sensor. This is level 0 or the Temperature Measurement level.

To access level 1, press P for 1 second until SP1 parameter  appears. To return to the temperature measurement level, press again.
To access level 2, press for 2 seconds until VNT parameter appears. Release the key to remain at this level. To access the other parameters of this level, press again. After the last parameter, the controller returns to the temperature measurement level.
To change the parameter values, press the you get the desired values. Notes:

• The controller saves the programming when you move from one parameter to another.
• Only then will it be considered valid. If the keys are not used for a time longer than 20 seconds, the controller returns to the measuring level, finishing and saving the configuration done so far.

LEVEL 1 – SETPOINT ADJUSTMENT LEVEL
At this level, only the Setpoint parameter (SP) is displayed. It defines the desired temperature value for the system. The current value of SP is shown alternately with the parameter.
To program the desired value, use and keys.

Setpoint values for the action of outputs 1, 2 and 3. These values are limited to the values programmed in SPL and SPk in the Operation Mode cycle.
The available parameters are according to the model.

LEVEL 2 – OPERATION MODE LEVEL
Displays the sequence of the remaining parameters to be set. The parameters are shown alternately with their values.
The number of outputs depends on the controller model.

vnt
Unit| Temperature unit. It allows you to choose the display unit of the measured temperature.
0 Temperature in Celsius degrees.
1 Temperature in Fahrenheit degrees.|
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typ
Type| Type of temperature sensor to be used.
This parameter is only available in models for THERMOCOUPLE sensors, where you can choose between the J , K , and T thermocouples.
0 Thermocouple J
1 Thermocouple K
2 Thermocouple T|
ofs

Offset

| Correction value for temperature indication.

Allows you to make small adjustments to the temperature indication to correct measurement errors that appear, for example, when replacing the NTC temperature sensor.

|
spl

SP Low Limit

| Setpoint lower limit.
Must be defined with a value lower than spK.|
spK
SP High Limit| Setpoint upper limit.
Must be defined with a value higher than spl.|
A(1| Output 1 action type:|
Action 1| 0 Control with Reverse Action. Suitable for heating. Turns on the control output when the temperature is below SP.|
| 1 Control with Direct Action. Suitable for cooling. Turns on the control output when the temperature is above SP.|
A(2| Output 2 and 3 action type:

0 Control. Reverse action for heating.
1 Control. Direct action for cooling.
2 Minimum temperature alarm.
3 Maximum temperature alarm.
4 Within-range alarm.
5 Out-of-range alarm.
6 Minimum temperature alarm with blocking.
7 Maximum temperature alarm with blocking.

|

initial initial

|
Action 2|
A(3|
Action 3|
| 8 Within-range alarm with initial blocking.
9 Out-of-range alarm with initial blocking. Parameters available only for N322 and N323 models.|
(nt

Control

| Inversion between Setpoints and Outputs:
0 SP1 acts on OUTPUT 1 relay and SP2 acts on OUTPUT 2 relay. Factory setting.
1 SP1 acts on OUTPUT 2 relay and SP2 acts on OUTPUT 1 relay.
Parameter available only for the N322 and N323 models.|
Ky1 Ky2| Control hysteresis. Parameter that applies to both control and alarm.|
Ky3

Hysteresis

| Differential between the on and off point of the relay output configured as a control output. In degrees.|
dli| Delay time for both control start and alarm.|
dl2 dl3

Delay

| After the controller is turned on, the output (1, 2, or 3) will only be turned on after the time programmed in this parameter has elapsed.|
| Used in large refrigeration systems to prevent the simultaneous activation of compressors when returning of a power failure.|
| Value in seconds (from 0 to 250 seconds).|
| Parameters available only for N322 and N323

models.

|
of1| N321 Model:|
of2| Sets minimum off time for the output.|
of3

Off time

|
N322 and N323 Model:

Sets minimum off time for output 1 and, when in Control Mode (Reverse Action and Direct Action), for outputs 2 and 3.

|
| In either model, when turned off , the output will stay in this condition for at least the time programmed in this parameter.|
| Typically used to increase the lifespan of the compressor in a refrigeration system. For heating applications, program zero.|
| Not valid for thermocouples.|
| Value in seconds (0 to 999 seconds).|
on1| N321 Model:|
on2| Sets minimum on time for the output.|
on3o
n time| |
N322 and N323 Model:|
| Sets minimum on time for output 1 and, when in Control Mode (Reverse Action and Direct Action), for outputs 2 and 3.|
| In either model, when turned on , the output will stay in this condition for at least the time programmed in this parameter.|
| Typically used to increase the lifespan of the compressor in a refrigeration system. For heating applications, program zero.|
| Not valid for thermocouples.|
| Value in seconds (0 to 999 seconds).|
2t1| Time interval T1 for alarm timing.|
2t2
Timer T1| Defines the timed action of alarms, as shown in
Table 2.|
| Adjustable between 0 and 1999 seconds.|
| Parameter available when outputs 2 and 3 are configured as alarms.|
| Parameters available only for the N323 model.|
3t1 3t2
Timer T2| Time interval T2 for alarm timing.

Defines the timed action of alarms, as shown in

Table 2.

Adjustable between 0 and 1999 seconds.

Parameter available when outputs 2 and 3 are configured as alarms.

Parameters available only for the N323 model.

|
Adr
Address| The controller with an RS485 serial communication interface features the Adr parameter at the Operation Mode level.|
| In this parameter, you define a communication address for each network element. The address set must be between 1 and 247.|

LEVEL 3 – CALIBRATION LEVEL
The controller leaves the factory already calibrated. When a recalibration is necessary, it must be performed by a specialized professional. To access this level, press the key for more than 3 seconds.
If you access it by accident, do not press the key, simply step through all the parameters, until the  controller returns to the measurement screen.

Pas
Password| Parameter to enter a password that will allow you to change the other parameters.
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[Al
Calibration Low| Allows to set the Offset of the measurement range. Adjusts the lower value of the sensor measurement range.
[Ak
Calibration High| Allows to calibrate the measure scale gain. Adjusts the upper value of the sensor measurement range.
[ J l
Cold Junction Calibration| Allows to calibrate the Cold Junction Offset. Only available for thermocouples.
FA(
Factory Calibration| Allows to return to the controller original calibration.
When changing from 0 to 1 , the original calibration will be restored, and the changes made during the calibration will be discarded.
Prt

Protection

| Allows to define the parameter levels to be protected.
Pa(

Password Change

| Allows to change the current password. You can set the password to a number between 1 and 999.
Sn2
Serial Number 2| Displays the first two digits of the electronic serial number of the controller.
sn1
Serial Number 1| Displays the middle three digits of electronic serial number of the controller.
sn0
Serial Number 0| Displays the last three digits of the electronic serial number of the controller.

OPERATION

N321 MODEL: OPERATION
The controller with a single output triggers this control output to bring the process temperature to the value set in parameter SP1 (Setpoint 1).
On the N323 front panel, the P1 flag will light when the control output is turned on.

N322 AND N323 MODELS: OPERATION
Controller models with multiple outputs have typical applications in alarm control and multi-stage power control.
In the alarmed control application, output 1 is used as the temperature control output, while outputs 2 and 3 are programmed to act as protection alarms or signaling.
In the multi-stage control application, the Setpoints of outputs 1, 2, and 3 are programmed to act at different temperatures. This allows you to trigger the compressors in a progressive sequence, increasing the refrigeration capacity as the temperature rises and reducing it when the temperature approaches the temperature programmed for SP1.
By using the compressor delay (dL1, dL2, and dL3), you ensure that, when returning from a power failure or when starting the system, the compressors will start according to the programmed timing. This allows you to reduce the energy demand.
Another typical application for the use of a multi-output controller concerns the automatic changeover of the hot/cold cycle, where one output will be programmed with Reverse Action and will command heating, and another will be programmed with Direct Action and will command cooling.

N322 AND N323 MODELS: ALARM FUNCTIONS
The N322 and N323 models have 8 alarm functions for outputs 2 and 3. A(2 and A(3 parameters can be programmed with the following values:

• 2 Minimum temperature alarm : The output turns on when the measured temperature is below the value programmed in the corresponding Setpoint (SP2 or SP3).

• 3 Maximum temperature alarm: The output turns on when the measured temperature is above the value programmed in the corresponding Setpoint (SP2 or SP3).

• 4 Within range temperature alarm: The output turns on when the measured temperature is within the temperature range defined by:
  (SP1 – SP2) and (SP1 + SP2)
  or
  (SP1 – SP3) and (SP1 + SP3)

• 5 Out-of-range temperature alarm: The output turns on when the measured temperature is outside the temperature range defined by:
  (SP1 – SP2) and (SP1 + SP2)
  or
  (SP1 – SP3) and (SP1 + SP3)

Functions 6, 7, 8, and 9 are identical to the functions mentioned in this section, but they have the Initial Alarm Blocking feature, which blocks the alarm (does not allow it to activate) when the controller initiates control already in an alarm condition.
The alarm will be unblocked after the equipment goes through a non-alarm condition.
Although they have the same operation and alarm functions, the N322 and N323 models have a different number of outputs (2 outputs for the former; 3 outputs for the latter), which should be considered while reading the above explanation.
Therefore, the N322 model will not show the dL3 and SP3 parameters, for example. Other differences may exist.

N323 MODEL: ALARM TIMER
The N323 model allows you to program a timer for alarms. You can set 3 conditions:

• Delay on alarm triggering,
• Pulse when triggering, or
• Triggering as sequential pulses.

Timing is only available for outputs 2 and 3 and can be programmed using the following parameters: 2t1, 3t1, 2t2, and 3t2. The figures in Table 2 represent these functions.
T1 and T2 can range from 0 to 1999 seconds, and their combinations determine the timing mode. For the alarms to have normal operation, without timings, program 0 (zero).
P2 and P3 flags light up whenever an alarm condition occurs, regardless of the status of the output relays. During the delay, the respective signal flag remains blinking.

CONFIGURATION PROTECTION

The purpose of the configuration protection system is to prevent undue changes to the parameters and, consequently, to its operating mode. This system is composed of parameters that define the protection degree to be adopted: Total or partial.
Parameters that define the level of protection:
Pas Parameter to enter a password to allow changes to the other parameters.
Prt Parameter to define the levels of parameters to be protected.

• Only the Calibration level is protected (factory setting option).
• The Calibration and Configuration levels are protected.
• All levels are protected: Calibration, Configuration, and SP.

PA ( Parameter to change the current password. You can set the password to a number between 1 and 999.

CONFIGURATION PROTECTION OPERATION
The PAS parameter appears at the beginning of the protected level. If you enter the password correctly, you can change the parameters of the protected levels. If you do not enter the password correctly or simply pass by this parameter, the parameters of the protected levels can only be viewed and not changed.
Important notes:

• When you enter an incorrect password 5 consecutive times, the equipment will prevent new attempts for 10 minutes.
  If you do not remember the current password, you can enter a master password, which only allows you to set a new password.

• The equipment leaves the factory with password 111.

MASTER PASSWORD

The master password, which allows you to set a new password for the controller, uses the serial number of the equipment. It is composed as follows:
[ 1 ] + [ largest number of SN2 ] + [ largest number of SN1 ] + [ largest number of SN0 ] The master password for an equipment with serial number 97123465 is: 1936
Example: 1 + sn2 = 97; sn1 = 123; sn0 = 465 = 1 + 9 + 3 + 6

HOW TO USE YOUR MASTER PASSWORD

• In the Pas parameter, enter the master password.
• In the PA( parameter, enter any new non-zero (0) password.
• Use the new password.

ERROR INDICATION
On the display, the controller shows messages that correspond to problems related to temperature measurement. Whenever they are displayed, the control output relay will be turned off immediately.

|

• The temperature has exceeded the upper limit of the sensor range.
• Pt100 or T/C sensor broken. NTC sensor short- circuited.

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• The temperature has exceeded the lower limit of the sensor range.
• Pt100 or T/C sensor short-circuited. Broken NTC sensor.

SERIAL COMMUNICATION (1.8 VERSION)
The controller can optionally be supplied with an RS485 serial communication interface, asynchronous, for communication with a supervisor software.

FEATURES

• Signals compatible with RS485 standard.
• 2-wire connection between 1 master and up to 31 slave controllers in bus topology. When using multi-output converters, you can reach up to 247 nodes.
• Maximum connection distance: 1000 meters.
• Rate: 9600 bps
• Data bits: 8
• Parity: None
• Stop bits: 1

The RS485 signals are:

??
C| Optional       connection        that        improves communication performance.
GND

Table 4 – RS485

PARAMETER CONFIGURATION
To use serial communication, you must set the following parameter: addr: Controller communication address.

COMMUNICATION PROTOCOL
The equipment supports the slave MODBUS RTU protocol, available in most supervision software on the market.
The Modbus commands available are the following:

• 03 – Read Holding Register
• 06 – Preset Single Register

Command 03 (Read Holding Register) reads up to 4 consecutive registers.

REGISTER TABLE
The following are the most used registers. For complete information, refer to the Register Table for Serial Communication, available for download in the product page.

Range: From spll to the value set in spkl.
0001| PV| Read: Measured temperature variable. Write: Not allowed.
Range: Equals the range of the sensor used by the equipment.

WARRANTY

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

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