TEMPERATURE CONTROLLER
N323R
OPERATING MANUAL V1.7x
The N323R is a Refrigeration controller designed to control the temperature of
refrigeration cases and coldrooms, embedding several specialized functions for best
system performance. The N323R can read two temperature probes (controller and
defrost probes) and has three relay outputs for controlling the compressor, the defrost
and the fan.
The controller can be ordered with optional features such as to comply with the
application’s requirements. The label on the instrument housing shows the complete
instrument configuration.
SPECIFICATIONS
PROBE INPUT: ....................................................................................2 Thermistor NTC
........................................................................................................ Type 10 k
Ω
@ 25 °C
.................................................................................Range: –50 to 120 °C (-58 to 248°F)
............................................................................................................... Accuracy: 0,6 °C
Two 3-meter probe cable are bundled with the instrument. The cable can be
extended up to 200 m. Sensor interchangeability: 0,75 °C. This error can be
compensated by the offset parameter in the controller.
Measurement Resolution: ...................................................0,1 °C from –19.9º to 199.9º
..................................................................................................................1 °C elsewhere
OUTPUT1: ...................... Relay SPDT; 1 HP 250 Vac / 1/3 HP 125 Vac (16 A Resistive)
...............................................Optionally: Pulse, 5 Vdc, 25 mA max.
OUTPUT2:........Relay SPST-NA, 3 A / 250 Vac (General use) ; 5A / 250Vac (Resistive)
OUTPUT3:.................. SPST-NA, 3 A / 250 Vac (General use) ; 5A / 250Vac (Resistive)
POWER SUPPLY:
............................... 100 to 240 Vca/dc
±
10 %
Optionally:.................................... 12 to 30 Vdc
Mains
frequency: ..............................50~60 Hz
Power
consumption: ................................ 5 VA
Dimensions:
Width x Height x Depth:...................................75 x 33 x75 mm
Weight: ........................................................................... 100 g
Panel
cut-out:.........................................................70 x 29 mm
ENVIRONMENT: .................................. Operating temperature: 0 to 40 ºC (32 to 122 ºF)
............................................................... Storage temperature: -20 to 60 ºC (-4 to 140 ºF)
.................................................................. 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
DIGITAL COMMUNICATION: ....................... RS-485, RTU MODBUS protocol (optional)
Serial interface not isolated from input circuitry.
Serial interface isolated from input circuitry, except in 24 V powered model.
INSTALLATION
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 inductor.
•
Use protection devices like circuit breakers and fuses.
ELECTRICAL WIRING
Figure 1 below shows the controller connections to sensor, mains and outputs.
Figure 1 – N323R terminals
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 N323R 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. Pressing
again to go back to level 0.
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 that 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.
3. While in the temperature measurement level, a momentary pressing on
the
key will show the Probe 2 temperature (evaporator temperature)
Level 1 – Setpoint Adjustment
In this level only the Setpoint (
SP
) 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
Case of coldroom temperate adjustment.
SP
value is limited to the
values programmed in
SPL
and
SPk
in the programming level
(Parameter configuration, level 2).
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
Unit
Temperature Unit. Selects display indication for degrees Celsius or
Fahrenheit
0
Temperature
Celsius.
(factory
default)
1
Temperature in degrees Fahrenheit.
Of1
Offset
Probe 1
Probe 1 Offset - Offset value to be added to the sensor 1 measured
temperature such as to perform fine adjustments to the value showed on
the display (after sensor replacement, for instance, if required).
Range: ± 0.1 to 10.0 degrees.
Of2
Offset
sensor 2
Probe 2 Offset - Offset value to be added to the sensor 2 measured
temperature to perform fine adjustments to the value showed on the
display (after sensor replacement, for instance, if required).
Range: ± 0.1 to 10.0 degrees.
Spl
SP Low Limit
SP Low Limit - Lower range for
SP
.
SPL
must be programmed with a
lower value than
spK
.
spK
SP High Limit
SP High Limit - Upper range for
SP
.
SPx
must be greater than
spl
.
Kys
Histeresis
OUTPUT 1 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.
(nt
Control
Defines the output position for the refrigeration relay.
0
Refrigeration at OUTPUT1 / Defrost at OUTPUT2. (factory default)
1
Refrigeration at OUTPUT2 / Defrost at OUTPUT1.
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.
0nt
on time
On time - Defines the minimum on time for refrigeration output. Once
turned on, OUTPUT 1 remains so for at least the time programmed in
ont
. This parameter is intended for refrigeration systems where
increased compressor life is desired. Value in seconds, 0 to 999 s.
0ft
Off time
Off time - Defines the minimum off time for control OUTPUT 1. Once
OUTPUT 1 is turned off, it remains so for at least the time programmed
in
oft
. This parameter is intended for refrigeration systems where
longer compressor life is desired. Value in seconds, 0 to 999 s.
df1
Defrost
Interval
Interval time between defrost cycles. Adjustable from 0 to 999s.
During this time, the defrost output remains off.
df1= 0
disables this function (no defrost cycles)
Dft
Defrost time
Defrost duration. Interval time during which the defrost output remains
on.
Value in minutes, 1 to 999.
