NOVUS N322T Temperature Controller User Manual

NOVUS N322T Temperature Controller

The N322T is a 2-output digital electronic controller for heating and cooling applications. It is available with NTC thermistor input sensor, Pt100 or J/K/T type thermocouple. Sensor offset correction is provided. The 2 independent outputs can be used as control or alarm. Displays the Compressor Protection Function by Supply Voltage Monitoring, important in the protection of compressors for refrigeration systems.

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); Maximum error in the interchangeability of original NTC sensors: 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 cable of 3 m in length, 2 x 0.5 mm², and can be extended up to 200 m.

• 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 1832 °F); Accuracy: 3 °C (5.4 °F);
• Thermocouple type T; Range: -50 to 400 °C (-58 to 752 °F); Accuracy: 3 °C (5.4 °F);
• Thermocouples according to IEC-584 standards.

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

…………………………………………………………………………………..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 Resistive)
……………………………………………………………………………………… Optionally: Pulse, 5 Vdc, 25 mA max.
OUTPUT2: ……………………………………………………………………………… Relay: 3 A / 250 Vac, SPST-NA
POWER SUPPLY: Voltage: ……………………………………………………………. 100~240 Vac/dc (± 10 %)
Optionally: ………………………………………………………………..24 V (12~30 Vdc/ac)
Mains frequency: ………………………………………………………………………. 50~60 Hz
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 104 °F)
………………………………………………………………………Storage temperature: -20 to 60 °C (-4 to 140 °F)
………………………………………………………………………. Relative humidity: 20 to 85 % (non-condensing)
Housing: Polycarbonate UL94 V-2.
Protection degree: 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.

ELECTRICAL WIRING

The figure below indicates the connection to the sensor, power supply and controller output, as well as a connection example.

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.

Recommendations for the installation

• Temperature sensor drivers must go through the plant separate system for drivers of control output and power supply if possible electroducts terrified.
• The controller’s power should come preferably a campus network for instrumentation or different from that used by phase control output.
• 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 4 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 P for 1 second until the “SP” message shows up. To go back to level 0, press P 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 P 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 (SP1 and SP2) parameters are available, alternating the names with their respective values. Adjust the desired temperature for each setpoint clicking on the and keys.

U| Voltage – The screen voltage measurement. For values lower than 150 Vac and higher than 254 Vac presents the message 0.

Function available for model N322T-NTC-LVD.

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SP| Set Point – Temperature adjustment for control. SP value is limited to the values programmed in SPL and SPk in the programming level.

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.

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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 J 1 – Thermocouple K 2 – Thermocouple T

ofs| 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.
kys| 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.
ale| Alarm Enable :

0 Alarm disabled;

1 Buzzer alarm and output 2 pulsed (1 second);

2 Buzzer alarm and output 2 pulsed;

3 Output 2 pulsed (1 second);

4 Output 2 pulsed.

Function available for models N322T-NTC and N322TB-NTC.

For N322T-NTC model 1 and 2 parameter work as 3 and 4 parameters respectively.

Alarm function works only for fot = 2 parameter.

Alt| Alarm Time – Sets the time for which the alarm will be triggered.

1 to 255 seconds

To turn the alarm off before the programmed time, just press  for 1 second. Function available for models N322T-NTC and N322TB-NTC.

Alarm function works only for fot = 2 parameter.

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.

(nt| Control – Associates Setpoints and Outputs.

0 Setpoint is assigned to OUTPUT1 and Setpoint to OUTPUT2 (factory setting).

1 Setpoint is assigned to OUTPUT2 where as Setpoint is directed to OUTPUT1.

oft| Off time – Defines the minimum off time for control OUTPUT. Once OUTPUT 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 – Defines the minimum on time for control OUTPUT. Once turned on, OUTPUT 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.
Tib| T1 Base – Time base for t1 :

0 Seconds                          1 Minutes      2 Hours

t2b| T2 Base – Time base for t2 :

0 Seconds                          1 Minutes      2 Hours

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t1| Time 1 – Adjusts the interval between consecutive output relay pulses, from 0  to 999 units of t1b.
t2| Time 2 – Timer output pulse duration, adjustable between 1 and 999 units of t2b.
fot| Force timer :

0 Timer period and duration t1 and t2 act regardless of the control output status.

1 Timer output is activated together with the control output. When the control output is turned off, the timer works as configured in t1 and t2 , T2 first.

2 The process will begin only when the key is pressed for more than 1 second to light up so the flag P3 if pressed again for more than 1 second, the process will be shut down indicating by a beep along with flags P1 and P2. When the temperature reach set point programmed for the first time, the flag P3 will flash indicating that the timer has been activated. When the scheduled time is reached, is disabled by turning the output 1 and P3 flag triggering the alarm as the ALE parameter. When this function is enabled, t1 and cnt are automatically zeroed and should remain at zero.

For defrost applications, configure Fot = 0. Not used for thermocouple inputs.

Function 2 available only for models N322T-NTC and N322TB-NTC.

dfh| Defrost hold – Holds the temperature indication constant during the defrost time plus the time defined in dFh. Not valid for thermocouple inputs.

0 Display indicates actual temperature;

1 a 250 Time, in seconds, minutes or hours, following the defrost, in which the indication remains constant, showing the temperature measured just before the defrost cycle.

When the defrost function is not used, configure dFh = 0 .

df(| Defrost compressor – Output (OUTPUT1 – compressor) behavior during defrost:

0 OUTPUT1 é turned off during defrost;

1 OUTPUT1 remains ON during the defrost;

2 OUTPUT1 acts regardless of the defrost cycle (controls the output normally, according to the programmed setpoint).

In refrigeration systems, OUTPUT1 is the normal compressor output. When defrost is not used, configure df( = 2.

Not valid for instruments with thermocouple input.

(pE| Compressor protect – Enables compressor protection by voltage monitoring. If the network voltage is not between the SetPoints (PL and (P K.

0 Disables compressor protection;

1 Enable compressor protection.

Function available only for model N322T-NTC-LVD.

(Pt| Compressor protect time – Determines a delay in the compressor shutting down when compressor protection’s activities by voltage monitoring. Adjustable time interval between adjustable between 5 to 30 seconds.

Function available only for model N322T-NTC-LVD.

(PL| CP low limit – Voltage lower limit used by the compressor protection. Voltage minimum value that the compressor can operate.

Parameter adjustable between 150 to 254 Vac must be obligatorily 10 Vac lower than the value set at the higher limit ((PH).

Function available only for model N322T-NTC-LVD.

(PH| CP high limit – Voltage lower limit used by the compressor protection. Voltage minimum value that the compressor can operate.

Parameter adjustable between 150 to 254 Vac must be obligatorily 10 Vac higher than the value set at the lower limit ((Pl).

Function available only for model N322T-NTC-LVD.

Add| Address – 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.

Level 3 – Calibration level
The controller is factory calibrated. The following parameters should be accessed only by experienced personnel. To enter this cycle, the P key must be kept pressed for 4 seconds.

Don’t press the and keys if you are not sure of the calibration procedures. Just press the P 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

The controller cycles the control output as to maintain the system temperature at the value configure in the Setpoint parameter. The display P1 sign is shown whenever the control output is activated. The timer output is typically used for the system defrost. The t1 and t2 parameters define, respectively, the interval and duration of the defrost cycles.
Manual Defrost: the key allows for the timer start or reset. Pressing this key for at least 1 second, the timer output is toggled.
The display P2 sign lights when the timer output is on. The timer output is usually used for defrost in refrigeration systems. In different applications it can be used to periodically start other loads, such as a mixer, fan, etc.

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.

1. Only calibration level is protected (factory configuration);
2. Calibration and Configuration levels are protected;
3. All levels are protected – calibration, Configuration and setpoints.

PAC 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

1. 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 password can be used only to define a new password for the controller.
2. 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 97123465 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. Now you can use this new password to access all controller parameters with modify rights.

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.

COMPRESSOR PROTECTION (N322T-NTC-LVD)
The controller constantly monitors the voltage of power network and shuts the compressor if this tension is not within limits. These limits are defined in parameters (PL and (Pk, adjustable between 150 and 254 Vac. In addition to turning the compressor off, the driver passes the signal on your display this occurrence: Toggles the indication of voltage value measured with the temperature value.
When the voltage exceeds limits (lower than 150 Vac and higher than 254 Vac) is signaling to indicate temperature alternating with the message 0.

WARRANTY

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

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