scigiene N323R Operating Manual

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 kΩ @ 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)
............................... 100 to 240 Vca/dc ±10 %
POWER SUPPLY:
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
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
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.
Case of coldroom temperate adjustment. SP value is limited to the
SP
values programmed in SPL and SPk in the programming level
Set Point
(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
the parameter name and respective value.
Temperature Unit. Selects display indication for degrees Celsius or
Unt
Fahrenheit
Unit
0 Temperature Celsius. (factory default)
1 Temperature in degrees Fahrenheit.
Probe 1 Offset - Offset value to be added to the sensor 1 measured
Of1
temperature such as to perform fine adjustments to the value showed on
Offset
the display (after sensor replacement, for instance, if required).
Probe 1
Range: ± 0.1 to 10.0 degrees.
Probe 2 Offset - Offset value to be added to the sensor 2 measured
Of2
temperature to perform fine adjustments to the value showed on the
Offset
display (after sensor replacement, for instance, if required).
sensor 2
Range: ± 0.1 to 10.0 degrees.
SP Low Limit - Lower range for SP. SPL must be programmed with a
Spl
lower value than spK.
SP Low Limit
SP High Limit - Upper range for SP. SPx must be greater than spl.
spK
SP High Limit
OUTPUT 1 Hysteresis: defines the differential range between the
Kys
temperature value at which the OUTPUT is turned on and the value at
Histeresis
which it is turned off. In degrees.
Defines the output position for the refrigeration relay.
(nt
Control
0 Refrigeration at OUTPUT1 / Defrost at OUTPUT2. (factory default)
1 Refrigeration at OUTPUT2 / Defrost at OUTPUT1.
Delay time to start control. Upon power-on, control OUTPUT 1 is kept off
Dly
until the time programmed in dly is elapsed. Its usage is intended to
Delay
prevent multiple compressors to start simultaneously after the turn-on of
a system with several controllers. Value in seconds, 0 to 250 s.
On time - Defines the minimum on time for refrigeration output. Once
key 0nt
turned on, OUTPUT 1 remains so for at least the time programmed in
on time
ont. This parameter is intended for refrigeration systems where
increased compressor life is desired. Value in seconds, 0 to 999 s.
key is pressed to
Off time - Defines the minimum off time for control OUTPUT 1. Once
0ft
OUTPUT 1 is turned off, it remains so for at least the time programmed
Off time
in oft. This parameter is intended for refrigeration systems where
longer compressor life is desired. Value in seconds, 0 to 999 s.
Interval time between defrost cycles. Adjustable from 0 to 999s.
df1
During this time, the defrost output remains off.
Defrost
Interval
df1= 0
Defrost duration. Interval time during which the defrost output remains
Dft
on.
Defrost time
Value in minutes, 1 to 999.
and keys to set the value. The display alternates
disables this function (no defrost cycles)