TEMPERATURE CONTROLLER
N322T
OPERATING MANUAL - V1.7x A
The N322T is a 2-output digital electronic 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 2 independent
outputs 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 options below
(specified when placing the order):
yNTC Thermistor, 10 kΩ@ 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.
yPt100 (α= 0,00385); Range: –50 to 300 °C (-58 to 572 °F);
Accuracy:0,7°C(1.3°F);IEC-751.
yPt1000 (α= 0,00385); Range: –200 to 530 °C (-328 to 986 °F);
Accuracy:0,7 °C (1.3°F);
yJ, 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 199.9º 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.
ELECTRICAL WIRING
Figure 1 below shows the controller connections to sensor, mains and outputs.
Figure 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.
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, contactors, 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 4 groups or
levels:
Level Function
0 Temperature measurement
1 Setpoint Adjustment
2 Configuration
3 Calibration
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 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.
2If 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.
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
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.
Act
Control action for OUTPUT 1:
0Reverse: For heating applications. Outputs turn on when
temperature is lower than SP.
1Direct: For cooling applications. Output turns on when
temperature is above SP.
(nt
Control - Associates Setpoints and Outputs.
0Setpoint is assigned to OUTPUT1 and Setpoint to
OUTPUT2 (factory setting).
1Setpoint 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
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.
