NOVUS N322T User Manual
TEMPERATURE CONTROLLER
N322T
OPERATING MANUAL - V1.8x
The N322T is a 2-output digital electronic controller for heating and cooling applications. It is available
Level
Function
0
Temperature measurement
1
Setpoint adjustment / Voltage indication
2
Configuration
3
Calibration
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.
SP
Set Point - Temperature adjustment for control. SP value is limited to the values
programmed in SPL and SPk in the programming level.
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 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.
with NTC thermistor input sensor, Pt100, Pt1000 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 input sensor type can be chosen form the options below (specified when
placing the order):
NTC Thermistor, 10 k @ 25 °C; range: –50 to 120 °C (-58 to 248 °F);
Accuracy: 0.6 °C (1.1 °F), with original sensor;
Sensor interchangeability: 0.75 °C (1.35 °F). This error can be compensated by the offset
parameter in the controller.
Pt100 (= 0.00385); Range: –50 to 300 °C (-58 to 572 °F);
Accuracy: 0.7 °C (1.3 °F); IEC-751.
Pt1000 (= 0.00385); Range: –200 to 530 °C (-328 to 986 °F);
Accuracy: 0.7 °C (1.3° F);
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 –19.9 to 199.9 º with NTC, Pt100 and Pt1000: ........................................................................... 0.1
Elsewhere: ....................................................................................................................................... 1
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: ........................................ 100~240 Vac/dc (± 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: 75 x 33 x 75 mm
............................................................................................ Panel cut-out: 70 x 29 mm; Weight: 100 g
ENVIRONMENT: .................................................... Operating temperature: 0 to 40 °C (32 to 122 °F)
.................................................................................. Storage temperature: -20 to 60 °C -4 to 140 °F)
.....................................................................................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.
Man 5001237
ELECTRICAL WIRING
Fig. 1 below shows the controller connections to sensor, mains and outputs.
Fig. 1 - N322T 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.
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 N322T 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. 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: 1 A parameter configuration is saved when the key is pressed to advance to the
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.
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 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.
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
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;
3 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 (PK.
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
pas
Password - Enter the correct password to unlock write operations for the
parameters in the following levels.
[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.
Measured temperature exceeded maximum allowed range for the sensor.
Broken Pt100, Pt1000 or T/C. Short circuited NTC sensor.
Measured temperature is below minimum measurement range of the sensor.
Short circuited Pt100, Pt1000 or T/C. Broken NTC.
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 4 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.
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 ] + [ highe r digit of SN1 ] + [ high er digit of SN0 ]
for example the master password for the device with serial number 987123465 is: 1 9 3 6
as follows: 1 + sn2= 987; 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:
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.
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.
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 web site www.novusautomation.com.
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