TEMPERATURE CONTROLLER
N322
OPERATING MANUAL - V1.8x F
Man 5001230
The N322 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 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 k
Ω
@ 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 (33.35 °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 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;
•
Pt1000; Range: –200 to 530 °C (–328 to 986 ºF);
α
= 0,00385; 3 wires;
Accuracy: 0.7 °C (1.3 °F);
•
Thermocouple type
J
; Range: 0 to 600 °C (32 to 1112 °F); Accuracy: 3 °C (5.4 °F);
•
Thermocouple type
K
; Range –50 to 120 °C (–58 to 248 °F); Accuracy: 3 °C (5.4 °F);
•
Thermocouple type
T
; Range: –50 to 120 °C (–58 to 248 °F); Accuracy: 3 °C (5.4 °F);
Thermocouples according to IEC-584 standards.
WARM-UP:
..................................................................................................... 15 minutes
MEASUREMENT RESOLUTION:
From –19.9 to 199.9 º with NTC, Pt100 and Pt1000: .................................................... 0.1
Elsewhere: .................................................................................................................. 1
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)
OUTPUT2:
........................................................................... Relay: 3 A / 250 Vac, SPST
POWER SUPPLY:
....................... 100~240 Vac (± 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: 74 x 32 x 75 mm
....................................................................... Panel cut-out: 70 x 29 mm; Weight: 100 g
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
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
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.
Fig. 1
below shows the controller connections to sensor, mains and outputs.
Fig. 1
– N322 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.
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 N322 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 “
SP1
” message shows up. 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
: 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.
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 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.
SP1
Set Point 1
Temperature adjustment for control OUTPUT 1.
SP1
value is limited to
the values programmed in
SPL
and
SPk
in the programming level
(Parameter configuration, level 2).
SP2
Set Point 2
Temperature adjustment for control OUTPUT 2.
SP2
value is limited to
the values programmed in
SPL
and
SPk
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
.
ky1
OUTPUT 1 Hysteresis
: defines the differential range between the
temperature value at which the OUTPUT 1 is turned on and the value at
which it is turned off. In degrees.
ky2
OUTPUT 2 Hysteresis
: defines the differential range between the
temperature value at which the OUTPUT 2 is turned on and the value at
which it is turned off. In degrees.
Ac1
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.
Ac2
Action 2 - Control OUTPUT 2 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.
