NOVUS N321 User Manual
TEMPERATURE CONTROLLER
N321
OPERATING MANUAL - V1.8x
The N321 is a temperature controller for heating and cooling applications. It is
Level
Function
0
Temperature measurement
1
Setpoint Adjustment
2
Configuration
3
Calibration
SP
Set Point
Temperature adjustment for control OUTPUT 1. SP value is limited
to the values programmed in SPL and SPk in the programming
level (Parameter configuration, level 2).
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 SP. SPL must be programmed
with a lower value than spK.
spK
SP High Limit - Upper range for SP. 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.
Act
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.
oft
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. 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 1.
Once turned on, OUTPUT 1 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
Delay1
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.
Add
Address
Adress - 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.
available with NTC thermistor input sensor, Pt100, Pt1000 or J/K/T type
thermocouple. Sensor offset correction is provided. The output 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 4 options below
(specified when placing the order):
NTC Thermistor, 10 k @ 25 ºC; range: –50 to 120 ºC (-58 to 248 ºF);
Accuracy: 1.0 ºC (1.1 °F), with original sensor;
Sensor interchangeability: 1 ºC (1.35 ºF). This error can be compensated by the
offset parameter in the controller.
Pt100 (= 385); Range: –50 to 300 ºC (-58 to 572 ºF);
Accuracy: 0.7 ºC (1.3 ºF); IEC-751.
Pt1000 (= 385); Range: –200 to 530 ºC (-328 to 986 ºF); Accuracy: 0,7 ºC (1.3 ºF);
J, 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 –19.9º to 199.9º display units with NTC, Pt100 and Pt1000: ...................... 0.1
elsewhere: ......................................................................................................... 1
OUTPUT1: ........... Relay SPDT; 1 HP 250 Vac / 1/3 HP 125 Vac (16 A Resistive)
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 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
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.
Man 5001222
Fig. 1 below shows the controller connections to sensor, mains and outputs.
Fig. 1 – N321 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:
Upon power-up, the N321 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 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 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 (SP) parameter is available, alternating the name
with its respective value. Adjust the desired temperature for setpoint by clicking on
the and keys.
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.
Level 3 – Calibration level
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 0 to 1 to 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.
DISPLAY
OUTPUT STATUS LED
KEYBOARD
Measured temperature exceeded maximum allowed range for
the sensor. Broken Pt1000 or T/C. Short circuited NTC sensor.
Measured temperature is below minimum measurement range of
the sensor. Short circuited Pt1000 or T/C. Broken NTC.
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.
WORKING WITH THE CONTROLLER
The N321 energizes the output relay such as to maintain the process temperature
on the setpoint value defined by the user. The output status led P1 signals when
the control output is on.
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. If wrong
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- Go to PA( 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:
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.
System failure should always be taken into account when designing a control
panel to avoid irreversible damage to equipment or people.
WARRANTY
Warranty conditions are available on our web site www.novusautomation.com.
Fig. 2 – Frontal Panel
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