NOVUS N323R User Manual

Page 2

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Dfs

Temperature for finalizing the defrost clycle – evaporator
temperature value as measured by sensor 2 which terminates the
defrost cycle, regardless of the time configured in

Dft

Range:–50 to +120 degrees

(-58 to 248°F)

NOTE: the defrost cycle will not initiate if the evaporator temperature is
the value defined in this parameter.

ddt

Drain down time – This parameter sets the time interval for keeping the
outputs off to allow optimum drying of the evaporator.

Value in minutes, 0 to 999.

frs

Evaporator temperature for liberating the fan – after defrost and
water draining, the refrigeration is turned on. To keep warm air from
circulating in the system, demanding more energy to lower the
temperature, the N323R can be configured to maintain the fan output
off until the temperature cools below the value defined in

frs

frs.

Range: : –50 to 120 °C (-58 to 248°F)

fdl

Fan maximum delay after draining – to assure product integrity, the
fan output will be unconditionally turned on after the time programmed
in fdl

fdl

fdl, regardless of the fact that the evaporator temperature may not

have reached the temperature value defined in frs

frs

Value in minutes, 0 to 999.

foc

Fan behavior during refrigeration .

Fan is active only when the compressor is on..

Fan is active during the complete refrigeration cycle, even when the

compressor is turned off.

fod

Fan behavior during defrost.

Fan is off during the defrost cycle.

Fan is active during the defrost cycle.

fss

Fan deactivation due to evaporator heating – evaporator temperature
that turns the Fan off when the evaporator heats up (above temperature
defined in

fss

), improving system efficiency and protecting the

compressor. The fan is allowed to turn on again when the temperature
drops 2 degrees below the value defined in this parameter.

Coe

Compressor function during a probe failure: This parameter fixes the
compressor operating mode in the event of the main probe failure.

Compressor is deactivated when probe 1 is in error.

Compressor is activated when probe 1 is in error

Dfh

defrost hold

Defrost hold time (temperature indication hold): This is the time
interval following the end of the defrost cycle for the controller to display
actual control temperature. During the defrost cycle and the time defined
by dfh

dfh

dfh, the display will be showing the last measured temperature prior

to the start of the defrost cycle.
0

function disabled (shows actual temperature during the

defrost cycle);

1 to 250 : Time interval (sec., min. or hours) after the end of defrost for

the display to show the actual control temperature.

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.

[l1

Calibration low input 1 – Zero value of the input 1. It adjusts the
lower measurement range of Probe 1.

[k1

Calibration High input 1 – Gain calibration. It adjusts the full scale
measurement range of the Probe 1.

[l2

Calibration low input 2 – Zero value of the input 2. It adjusts the
lower measurement range of of Probe 2.

[k2

Calibration High input 2 – Gain calibration. It adjusts the full scale
measurement range of the Probe 2.

FA(

Factory Calibration – Restores factory calibration parameters. The
value 1 restores the calibration parameters to the factory values.

Prt

Protection – Defines the levels of parameters that will be password
protected. See “Configuration Protection Usage” for details.

Pa(

Password Change - Allows changing the current password to a new
one. Values from 1 to 999.

Sn2

Serial number - First part of the instrument serial number.

sn1

Serial number - Second part of the instrument serial number.

sn0

Serial number - Third part of the instrument serial number.

CONTROLLER OPERATION

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.

Defrost
Function to eliminate the ice accumulated on the evaporator, for improving system
efficiency. The duration and interval of the defrost cycles are user configurable.
However, it may be unconditionally terminated depending on the evaporator
temperature as measured by Probe 2 (refer to the dfs

dfs

dfs parameter)

The defrost can be achieved by: 1) compressor deactivation; 2) electrical heater or

3) heat pump inversion.

In the first case, the refrigeration is turned off and the defrost happens naturally. In the
second case the defrost output drives an electrical resistance to generate heat and so
melt the ice. In this mode, the compressor output is also deactivated. In the third case,
heat pump inversion, the compressor is kept active and the defrost output commands
the valve that inverts the heat cycle.

During defrost, the case of coldroom temperature may be forced to reflect the last
temperature measured prior to entering the defrost cycle (refer to the dfh

dfh

dfh parameter).

The df1

df1

df1 and dft

dft

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 3 seconds will toggle the current defrost status.

Definition of the evaporator temperature that terminates the defrost. (dfs

dfs

parameter)
- Wait for ice building on the evaporator;
- Start a defrost cycle manually;
- Visually monitor the evaporator until there is no more ice on it.
- Check the Probe 2 temperature (momentary press on the

key). This is the

correct temperature setting for the dfs

dfs

dfs.parameter.

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 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

The PAS

PAS

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: 1 9 3 6

as follows: 1 + sn2

sn2

sn2= 987; sn1

sn1

sn1= 123; sn0

sn0

sn0= 465 = 1 9 3 6

How to use the master password:

1- Enter the master password value at PaS

PaS

prompt.

2- Go to PA(

PA(

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

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, 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.

PRODUCT IDENTIFICATION

The label attached to the controller case identifies the model and the optional present in
the product, as described below:

MODEL: N323R - A - B - C, where:

A: Input Sensor:

NTC

B: Digital communication:

blank or 485 (RS485, Modbus protocol)

C. Voltage rating:

blank (100-240 Vac/dc) or 24V (10-30 Vac/dc);

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