NOVUS N322 User Manual
TEMPERATURE CONTROLLER
N322
OPERATING MANUAL - V1.8x
The N322 is a 2-output digital electronic controller for heating and cooling applications.
Level
Function
0
Temperature measurement
1
Setpoint Adjustment
2
Configuration
3
Calibration
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
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.
(nt
Control
Control - Associates Setpoints and Outputs.
0 Setpoint 1 is assigned to OUTPUT1 and Setpoint 2 to OUTPUT2
(factory setting).
1 Setpoint 1 is assigned to OUTPUT2 where as Setpoint 2 is
directed to OUTPUT1.
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):
NTC Thermistor, 10 k @ 25 °C; range: –50 to 120 °C (-58 to 248 °F);
Accuracy: 1.0 °C (1.1 °F), with original sensor;
Sensor interchangeability: 1 °C (1.35 °F). This error can be compensated by the
offset parameter in the controller.
Pt100 (= 385); Range: –50 to 300 °C (-58 to 572 °F);
Accuracy: 0.7 °C (1.3 °F); IEC-751.
Pt1000 (= 385); Range: –200 to 530 °C (-328 to 986 °F); Accuracy: 0.7 °C (1.3° F);
J, K or T thermocouple (IEC-584):
Type J: Range: 0 to 600 °C (32 to 1112 °F); Accuracy: 3 °C (5.4 °F);
Type K: Range: -50 to 1000 °C (-58 to 1832 °F); Accuracy: 3 °C (5.4 °F);
Type T: Range: -50 to 400 °C (-58 to 752 °F); Accuracy: 3 °C (5.4 °F);
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 199.9 º with NTC, Pt100 and Pt1000: .................................................... 0.1
Elsewhere: .................................................................................................................. 1
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 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
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.
Man 5001230
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:
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 deenergized.
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.
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.
of1
Off time 1
Off time 1 - 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 of1. 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 of1 to zero.
Value in seconds, 0 to 999 s.
on1
on time 1
On time 1 - Defines the minimum on time for control OUTPUT 1. Once
turned on, OUTPUT 1 remains so for at least the time programmed in
on1. 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 on1 to zero.
Value in seconds, 0 to 999 s.
dl1
Delay 1
Delay 1 - Delay time to start control. Upon power-on, control OUTPUT 1 is
kept off until the time programmed in dl1 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.
of2
Off time 2
Off time 2 - Defines the minimum off time for control OUTPUT 2. Once
OUTPUT 2 is turned off, it remains so for at least the time programmed
in of2. 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 on2 to zero.
Value in seconds, 0 to 999 s.
on2
on time 2
On time 2 - Defines the minimum on time for control OUTPUT 2. Once
turned on, OUTPUT 2 remains so for at least the time programmed in
on2. For thermocouple inputs this parameter is not available. This
parameter is intended for refrigeration systems where increased
compressor life is desired. Value in seconds, 0 to 999 s. For heating
systems, program of2 to zero.
dl2
Delay 2
Delay 2 - Delay time for OUTPUT 2 to turn on relative to OUTPUT 1.
This parameter defines a particular working mode, typically used in
multiple stage systems, where OUTPUT 2 is allowed to go on only if
OUTPUT 1 is already on for at least dL2 seconds. Also, OUTPUT 2 is
driven off whenever OUTPUT 1 goes off. dL2= 0 disables this
function. Value in seconds, 0 to 250 s.
Addr
Address
Address - Controllers with the optional RS485 Modbus RTU
communication interface have the Addr 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
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 restores 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.
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 the
sensor. Short circuited Pt100, 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
Multiple output controllers are suited for controlling multiple stage systems.
Other applications require OUTPUT 1 to be the control output and OUTPUT 2 to be the
alarm.
There are eight distinct alarm functions implemented in OUTPUT 2, selected by the
parameter Ac2, described below:
2 - Low temperature alarm – OUTPUT 2 is turned on when the measured
temperature falls below the SP2 value.
3 - High temperature alarm – OUTPUT 2 is turned on when the measured
temperature exceeds the value programmed in SP2.
4 - Inside range alarm – OUTPUT 2 is turned on when the measured
temperature is within the range defined by:
(SP1 – SP2) and (SP1 + SP2)
5 - Outside range alarm: OUTPUT 2 is turned on when the temperature falls
outside the range defined by:
(SP1 – SP2) and (SP1 + SP2)
Functions 6, 7, 8 e 9 are identical to the above ones except that they incorporate the Initial
Blocking feature, which inhibits the output if an alarm condition is present at start-up. The
alarm will be unblocked after the process reaches a non-alarm condition for the first time.
In a multiple stage application, SP1 and SP2 are configured to operate at different
temperatures, creating a progressive sequence for turning on the outputs
(compressors) in response to a system demand. The output delays for turning on the
compressors (dL1 and dL2) cause the compressors to be turned on one by one,
minimizing energy demand.
Another usage for multiple output controllers is in systems that require automatic
selection between cool and heat action. In these applications, one output is configured
as reverse action (heating) and the other as direct action (refrigeration). The output
status led P1 and P2 in the controller panel, signals when the control output in 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 ] + [ h igher 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 PaS prompt.
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:
WARRANTY
Warranty conditions are available on our web site www.novusautoamtion.com.
Loading...