NOVUS N322RHT User Manual

Page 2

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Ac2

Action 2 - Control OUTPUT 2 action or Alarm functions:

Reverse control action (heating or humidification). (See

(nt

parameter below).

Direct control action (cooling or dehumidification).

Low (minimum value) alarm.

High (maximum value) alarm.

Alarm inside the range

Alarm outside the range.

Low alarm with initial blocking.

High alarm with initial blocking.

Inside the range alarm with initial blocking.

Outside the range alarm with initial blocking.

The section Working with the RHT Controller describes how these
functions work.

(nt

Assigns the relay for each variable:

OUTPUT 1 = RH;

OUTPUT 2 = RH;

OUTPUT 1 = RH;

OUTPUT 2 = Temperature;

OUTPUT 1 = Temperature; OUTPUT 2 = RH;

OUTPUT 1 = Temperature; OUTPUT 2 = Temperature;

of1

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

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 to zero. Value in seconds, 0

to 999 s.

on1

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

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 to zero. Value in seconds, 0 to

999 s.

dl1

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

dl1

dl1 is elapsed. Its usage is intended to

prevent multiple compressors to start simultaneously after the turn-on of a
system with several instruments. Value in seconds, 0 to 250 s.

of2

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

of2

of2. For thermocouple inputs this parameter is not available. This
parameter is intended for refrigeration systems where increased compressor
life is an issue. For heating systems, program

on2

on2 to zero. Value in

seconds, 0 to 999 s.

on2

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

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

of2 to

zero.

dl2

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

dL2 seconds. Also, OUTPUT 2 is driven off whenever

OUTPUT 1 goes off.

dL2

dL2= 0

0 disables this function. Value in seconds, 0 to

250 s.

Add

Adress – The parameter

Add

Add is presented in instruments loaded with the

optional RS485 Modbus RTU communication interface.

Set a unique Modbus address for each equipment connected to the network.
Address range is from 1 to 247.

Level 3 – Calibration level

The N322RHT 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 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 electronic serial number of the instrument.

This is a read only parameter.

sn1

Serial number - Second part of the electronic serial number of the
instrument. This is a read only parameter.

sn0

Serial number - Third part of the electronic serial number of the instrument.
This is a read only parameter.

WORKING WITH THE RHT 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

Ac2

Ac2, described below:

2 - Low alarm – OUTPUT 2 is turned on when the selected variable, as assigned for

OUTPUT 2 in the

(nt

(nt parameter, falls below the SP2

SP2

SP2 value.

3 - High alarm – OUTPUT 2 is turned on when the selected variable exceeds the

value programmed in

SP2

SP2.

4 - Inside range alarm – OUTPUT 2 is turned on when the selected variable is within

the range defined by:

(

SP1

SP1 – SP2

SP2

SP2) and (SP1

SP1

SP1 + SP2

SP2

SP2)

5 - Outside range alarm: OUTPUT 2 is turned on when the selected variable falls

outside the range defined by:

(

SP1

SP1 – SP2

SP2

SP2) and (SP1

SP1

SP1 + SP2

SP2

SP2)

Functions

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.

In a multiple stage application,

SP1

SP1 and SP2

SP2

SP2 are configured to operate at different settings,

creating a progressive sequence for turning on the outputs (compressors or resistances) in
response to a system’s demand. The output delays for turning on the compressors (

dL1

dL1 and

dL2

dL2) cause the outputs to be turned on one by one, minimizing energy demand.
Another usage for multiple output controllers is in systems that require both direct and reverse
actions (for cooling and heating, simultaneously, for instance). In these applications, one
output is configured as reverse action and the other as direct action. The output status leds
P1 and P2 in the instrument panel signal the current action being performed.

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

The

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 factory default password 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: 1 9 3 6

as follows: 1 +

sn2

sn2= 987; sn1

sn1

sn1= 123; sn0

sn0

sn0= 465 = 1 + 9 + 3 + 6

How to use the master password:

Enter the master password value at

PaS

prompt.

2- Go to

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:

Overflow

Underflow

Sensor error

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