NOVUS N321S User Manual

Page 2

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Ky2

Histeresis 2

Overheating temperature hysteresis of sensor S2 (kt2

kt2

kt2). In

degrees.

Adjustable between 0.1 and 50.0 °C.

dly

Delay

Control start delay. After having the controller turned on, the
control output will be activated after the time programmed in this
parameter has lapsed.

Value in seconds, from 0 to 250 seconds.

0f1

Offset Sensor 1

Offset correction value for the temperature measured by the
sensor 1. This parameter allows for small adjustments in the
sensor 1 temperature reading. Measurement differences may
happen, for instance, when a temperature sensor is replaced.

Adjustable from -10.0 to 10.0 °C.

0f2

Offset Sensor 2

Offset correction value for the temperature measured by the
sensor 2. This parameter allows small adjustments to the sensor
2 temperature reading. Measurement differences may occur, for
instance, when a temperature sensor is replaced.

Adjustable from -10.0 to 10.0 °C.

spl

SP Low Limit

Lower limit of the setpoint value: defines the minimum value for
setpoint adjustment. In degrees.

Adjustable between -50 and 120 °C.

spk

SP High Limit

Upper limit of the setpoint: defines the maximum value for
setpoint adjustment. Must be defined with a value necessarily
higher than spl

spl

spl. In degrees.

Adjustable between -50 and 120 °C.

Add

Address

Modbus Address: used to define a unique network address in
instruments that are featured with the optional RS485 Modbus
RTU communication.

Address range is from 1 to 247.

Nível 3 – Calibration level

The N321S 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 10 seconds to access this level. This level contains also the

parameters for configurating 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 in
the following parameters.

[

Calibration Low Input 1 – Input 1 offset.

[

Calibration High Input 1 – Gain adjustment (full scale value).

[l2

Calibration Low Input 2 - Input 2 offset.

[k2

Calibration High Input 2 – Input 2 gain adjustment (full scale value).

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 2 - First part of the controller electronic serial number.

sn1

Serial number 1 - Second part of the controller electronic serial
number.

sn0

Serial number 0 - Third part of the controller electronic serial
number.

WORKING WITH THE CONTROLLER

While the solar collector is receiving energy, the temperature in the sensor S1
increases. When T1 – T2 is higher than the value specified in d0n

d0n

d0n, the pump will

be turned on, circulating the heated water down and storing it in the tank.

As the pump is operating, the hot water will circulate downwards and the cold water
goes upwards. Consequently, the temperature difference between S1 and S2 tends
to diminish. When this difference goes under the value configured in d0f

d0f

d0f, the

pump will be turned off and the water circulation will stop.

The signaler P1 at the front panel of the controller will light up when the control
output is activated.

Figure 2 – Front Panel

Indicator

Function

Sensor 1 temperature

Sensor 2 temperature

T1 T2

S1 – S2 (Differential Temperature)

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

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 change 1 to 999.

CONFIGURATION PROTECTION USAGE

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 987123465 is: 1936

As follows:

sn2

sn2= 987;

sn1

sn1= 123;

sn0

sn0= 465 =

1 + 9 + 3 + 6

How to use the master password:
1- Enter the master password value at PaS

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

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. Short circuited NTC sensor.

IND

ND = 0

0 or 1

•

Measured temperature is below minimum measurement
range of the sensor. Broken NTC.

IND

IND = 0

0 or 1

•

If the temperature in S1 or S2 exceeds the measurement
limit IND

IND

IND = 2

2, the differential value displayed is 0

DESIGNATION SYSTEM

N321S

-485

- 24V

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