scigiene N322T User manual

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.

dly
Delay
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
simultaneouly after the turn-on of a system with several
controllers. Value in seconds, 0 to 250 s.
t1b
T1 Base Time base for t1:
0Seconds 1Minutes 2Hours
t2b
T2 Base Time base for t2:
0Seconds 1Minutes 2Hours
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
0Timer period and duration t1 and t2 act regardless of the
control output status.
1Timer 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.
For defrost applications, configure Fot=0.
Not used for thermocouple inputs.
dfh
defrost hold
Holds the temperature indication constant during the defrost time
plus the time defined in dFh. Not valid for thermocouple inputs.
0Display indicates actual temperature;
1a250 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:
0OUTPUT1 é turned off during defrost;
1OUTPUT1 remains ON during the defrost;
2OUTPUT1 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.
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
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.
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 0to 1to 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.
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. Ifwrong
or no password is entered, parameters in the following levels will be read only.
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 ] + [ higher digit of SN1 ] + [ higher 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 PaSprompt.
2- GotoPA( 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:
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
thesensor.Short circuited Pt100, Pt1000 or T/C. Broken NTC.