NOVUS N323 User Manual

Page 2

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dl1

Dl2

Dl3

Delay 1, 2 and 3 - Delay time to start control. Upon power-on, control OUTPUT
1 is kept off until the time programmed in dl1

dl1

dl1 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.

of1

Of2

Of3

Off time 1, 2 and 3 - Defines the minimum off time for control OUTPUT.
Once OUTPUT 1 is turned off, it remains so for at least the time programmed
in of1

of1

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

of1

of1 to zero. Value in seconds, 0

to 999 s.

On1

On2

On3

On time 1, 2 and 3 - Defines the minimum on time for control OUTPUT 1.
Once turned on, OUTPUT 1 remains so for at least the time programmed in
on1

on1

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

on1

on1 to zero. Value in seconds,

0 to 999 s.

2t1

2t1
3t1

3t1

Timer T1

Time interval T1 for alarm temporization. Defines the temporization mode
and interval, as shown in Table 4. Adjustable from 0 to 1999 seconds.
Available only when outputs 2 or 3 are configured as alarms.

2t2

2t2
3t2

3t2

Timer T2

Time interval T2 for alarm temporization. Defines the temporization mode
and interval, as shown in Table 4. Adjustable from 0 to 1999 seconds.
Available only when outputs 2 or 3 are configured as alarms.

Add

Adress - Controllers with the optional RS485 Modbus RTU communication
interface have the Add

Add

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 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.

[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.

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.

In a multiple stage application, SP1

SP1

SP1,,,, SP2

SP2

SP2 and SP

SP3

3 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

dL1

dL1, dl2

dl2

dl2 and dL

dL3

3) 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).

Alarm Functions

There are eight distinct alarm functions implemented in OUTPUT 2 and 3, selected by the
parameter Ac2

Ac2

Ac2 and ac3

ac3

ac3, described below:

- Low temperature alarm – OUTPUT is turned on when the measured temperature falls

below the respective set point value.

- High temperature alarm – OUTPUT is turned on when the measured temperature

exceeds the respective set point value.

- Inside range alarm – OUTPUT 2 is turned on when the measured temperature is within

the range defined by:

(SP1

SP1

SP1 – SP2

SP2

SP2) and (SP1

SP1

SP1 + SP2

SP2

SP2) or (SP1

SP1

SP1 – SP3

SP3

SP3) and (SP1

SP1

SP1 + SP3

SP3

SP3)

- Outside range alarm: OUTPUT 2 is turned on when the temperature falls outside the

range defined by:

(SP1

SP1

SP1 – SP2

SP2

SP2) and (SP1

SP1

SP1 + SP2

SP2

SP2) or (SP1

SP1

SP1 – SP3

SP3

SP3) and (SP1

SP1

SP1 + SP3

SP3

SP3)

Functions 6

6, 7

7, 8

8 e 9

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.

Alarm Timer

Alarms can be configured for timed operation. Three operation modes can be programmed:
alarm delay, alarm timed pulse or alarm oscillator. Alarm temporization is available only for
outputs 2 and 3 and is configured through parameters: “2t1

2t1

2t1”, “3t1

3t1

3t1”, “2t2

2t2

2t2” and “3t2

3t2

3t2”.

Table 4 shows these advanced functions. Times T1 and T2 can be programmed from 0 to
1999 seconds. Programming 0 (zero) in the timer parameters T1 and T2 disables the timer
function.

The output status led P2 and P3 in the controller panel, signals when the control output is on.

Advanced

Function

ACTION

Normal Operation

Alarm Event

Alarm

Output

Delayed

1 to 1999 s

Alarm Event

Alarm

Output

Pulse

1 to 1999 s

Alarm Event

Alarm

Output

Oscillator

1 to 1999 s 1 to 1999 s

Alarm Event

Alarm

Output

Table 4 – Timer Alarm Functions 1 and 2

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

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.

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. 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: N323 - A - B - C, where:

A: Input Sensor:

NTC or Pt100 or Pt1000 or J/K/T (Thermocouples)

B: Digital communication:

blank or 485 (RS485, Modbus protocol)

C. Voltage rating:

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

TECHNICAL ASSISTANCE

If you encounter a problem with your controller, review the configuration with regard to inputs,
outputs, alarms, etc. If the problem persists, contact your supplier or Novus at
[email protected].

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