Novus N321R User manual

TEMPERATURE CONTROLLER
N321R
OPERATING MANUAL V1.8x F
The N321R is a controller for cooling applications, with defrost function (forced compressor
shut-down). It accepts NTC, Pt100 and Pt1000 temperature probes, depending on the
product code (the user must observe the measurement range of the selected sensor). The
N321R control output is capable of driving a compressor load of up to 1 HP directly.
The features of a particular model (input sensor type, sensor range, mains supply, etc) are
identified by the label placed on the thermometer body.
SPECIFICATIONS
SENSOR INPUT:The sensor is chosen by the user at the time of purchase and is presented
on the upper side of the equipment box. The options are:
•Thermistor NTC, 10 k
Ω
@ 25 °C; Range: -50 to 120 °C (-58 to 248 °F);
Accuracy: 0.6 °C (1.1 °F);
Maximum error in the interchangeability of original NTC sensors: 0.75 °C (1.35 °F). This
error can be eliminated through the offset parameter of the equipment.
Note: For the NTC thermistor option, the sensor comes with the equipment. Its
operating range is limited to -30 to +105 °C (-222 to +221 °F). It has cable of 3 meters
in length, 2 x 0.5 mm², and can be extended up to 200 meters.
•Pt100; Range: -50 to 300 °C (-58 to 572 °F);
α
= 0,00385; 3 wires;
Accuracy: 0.7 °C (1.3 °F); according to IEC-751 standards;
•Pt1000; Range: –200 to 530 °C (-328 to 986 ºF);
α
= 0,00385; 3 wires;
Accuracy: 0.7 °C (1.3 °F).
Measurement Resolution:............................................................... 0.1 º from -19.9 to 199.9 º
..................................................................................... 1 ºC elsewhere
Note: The equipment keeps its precision all over the range, despite the lack of display
resolution in a part of the range does not allow its visualization.
OUTPUT1:...............................Relay SPDT; 1 HP 250 Vac / 1/3 HP 125 Vac (16 A Resistive)
POWER SUPPLY: .........................................100 to 240 Vac/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 x 75 mm
Weight: .......................................................................................100 g
Panel cut-out: ....................................................................70 x 29 mm
Environment: Operating temperature:........................0 to 40 °C (32 to 104 ºF)
Storage temperature: ........................ -20 to 60 °C (-4 to 140 ºF)
Relative humidity:.................................................20 to 85 % RH
Case Polycarbonate UL94 V-2
Protection: Box IP42, Frontal panel IP65
Suitable wiring: Up to 4.0 mm²
Serial interface not isolated from input circuitry.
Serial interface isolated from input circuitry, except in 24 V powered model.
ELECTRICAL WIRING
Fig. 01 below shows the controller connections to sensor, mains and outputs.
Fig. 01 - N321R terminals
* The serial communication interface is optional.
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.
Recommendations for the Installation
•Temperature sensor drivers must go through the plant separate system for drivers of
control output and power supply if possible electroducts terrified.
•The controller's power should come preferably a campus network for instrumentation or
different from that used by phase control output.
•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 / Voltage indication
2
Configuration
3 Calibration
Upon power-up, the controller 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 2of 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 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.
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 (SP) parameters are available, alternating the names with their
respective values. Adjust the desired temperature for each setpoint clicking on the and
keys.
U
Voltage
The screen voltage measurement. For values lower than 150 Vac and
higher than 254 Vac presents the message 0.
Function available only for model N321R-NTC-LVD.
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).
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. (factory default)
1
Temperature in degrees Fahrenheit.
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
.
kys
Histeresis
OUTPUT 1 Hysteresis: Defines the differential range between the OUTPUT
1 temperature value at which it is turned off. In degrees.
oft
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.
ont
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
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 compress
ors to start
simultaneously after the turn-on of a system with several controllers.
Value in seconds, 0 to 250 s.
dib
Defrost
Interval Base
Time base for
dfi
:
0
Seconds
1
Minutes
2
Hours
dtb
Defrost Time
Base
Time base for
dft
:
0
Seconds
1
Minutes
2
Hours
dfi
Defrost
interval
Interval between defrost cycles. Can be selected 0 to 999 seconds/
minutes/hours, according the value specified at
dib
.
Dft
Defrost time
Defrost duration. Can be 1 to 999 seconds / minutes / hours, according the
value specified at
dtb
.
dfh
Defrost hold
Hold the temperature indication throughout the defrost interval or the time
defined by this parameter.
0
Do not hold the indication during the defrost;
1
to
250
Time (seconds / minutes / hours)
besides the defrost time
the indication will remain held.

(pe
Compressor
Protect
Enables compressor protection by voltage monitoring. If the network voltage
is not between the SetPoints
(PL
and
(PK
.
0
Disables compressor protection.
1
Enable compressor protection.
Function available only for model N321R-NTC-LVD.
(Pt
Compressor
Protect Time
Determines a delay in the compressor shutting down when compressor
protection's activities by voltage monitoring. Adjustable time interval
between adjustable between 5 to 30 seconds.
Function available only for model N321R-NTC-LVD.
(PL
CP Low Limit
Voltage lower limit used by the compressor protection. Voltage minimum
value that the compressor can operate.
Parameter adjustable between 150 to 254 Vac must be obligatori
ly 5 Vac
lower than the value set at the higher limit (
(PH
).
Function available only for model N321R-NTC-LVD.
(PH
CP High Limit
Voltage lower limit used by the compressor protection. Voltage minimum
value that the compressor can operate.
Parameter adjustable between 150 to 254 Vac must be obligatorily 5 Vac
higher than the value set at the lower limit (
(Pl
).
Function available only for model N321R-NTC-LVD.
Add
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.
Level 3 – Calibration Level
The controller inputs are factory calibrated and recalibration should only be done by qualified
personnel. If you are not familiar with these procedures do not attempt to calibrate this.
Press the key for 3 seconds to access this level. This level contains also the
parameters for configuration the protection.
If you have entered this level accidentally, go through all the parameters without
making any changes until the controller returns to the measurement 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.
Uol
Voltage Calibration - Offset adjustment for calibrating the voltage
indication.
Function available only for model N321R-NTC-LVD.
[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.
WORKING WITH THE CONTROLLER
The controller turns on and off the compressor output such as to maintain the temperature at
the selected Setpoint. The front panel display shows the symbol whenever the
compressor is active.
The defrost process of this controller is executed by stopping the compressor. This
procedure is done every time interval defined by the user. The control output remains off by
time also defined by the user. During the defrost procedure the temperature indication can
be held by adjusting the parameter
dfk
.
The
df1
and
dft
parameters define, respectively, the time interval between defrosts and
the duration of the defrost cycle. The controller display shows the symbol to indicate that
a defrost cycle is in progress.
Manual defrost: The key allows that a defrost cycle be initiated of terminated
immediately. Pressing this key for 1 second will toggle the current defrost status.
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 must 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 SP.
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
The
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 987123 465 is: 1936
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 - Use this new password.
ERROR MESSAGES
Probe 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 or Pt1000. Short circuited NTC sensor.
•Measured temperature is below minimum
measurement range of the
sensor.
•Short circuited Pt100 or Pt1000. Broken NTC.
COMPRESSOR PROTECTION (N321R-NTC-LVD)
The controller constantly monitors the voltage of power network and shuts the compressor if
this tension is not within limits. These limits are defined in parameters
(PL
and
(Pk
,
adjustable between 150 and 254 Vac. In addition to turning the compressor off, the driver
passes the signal on your display this occurrence: Toggles the indication of voltage value
measured with the temperature value.
When the voltage exceeds limits (lower than 150 Vac and higher than 254 Vac) is signaling
to indicate temperature alternating with the message
0
.
WARRANTY
Warranty conditions are available on our website www.novusautomation.com/warranty.