Novus N322RHT User Manual download pdf (Page 2)

Ac2

Ac2Ac2

Ac2

Action 2 - Control OUTPUT 2 action or Alarm functions:

0 Reverse control action (heating or humidification). (See (nt

(nt(nt

(nt

parameter below).

1 Direct control action (cooling or dehumidification).

2 Low (minimum value) alarm.

3 High (maximum value) alarm.

4 Alarm inside the range

5 Alarm outside the range.

6 Low alarm with initial blocking.

7 High alarm with initial blocking.

8 Inside the range alarm with initial blocking.

9 Outside the range alarm with initial blocking.

The section Working with the RHT Controller describes how these

functions work.

(nt

(nt(nt

(nt

Assigns the relay for each variable:

0 OUTPUT 1 = RH; OUTPUT 2 = RH;

1 OUTPUT 1 = RH; OUTPUT 2 = Temperature;

2 OUTPUT 1 = Temperature; OUTPUT 2 = RH;

3 OUTPUT 1 = Temperature; OUTPUT 2 = Temperature;

of1

of1of1

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

of1of1

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

of1 to zero. Value in seconds, 0

to 999 s.

on1

on1on1

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

on1on1

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

on1 to zero. Value in seconds, 0 to

999 s.

dl1

dl1dl1

dl1

Delay 1 - Delay time to start control. Upon power-on, control OUTPUT 1 is kept

off until the time programmed in dl1

dl1dl1

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

of2of2

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

of2of2

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 on2

on2 to zero. Value in

seconds, 0 to 999 s.

on2

on2on2

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

on2on2

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 of2

of2 to

zero.

dl2

dl2dl2

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

dL2dL2

dL2 seconds. Also, OUTPUT 2 is driven off whenever

OUTPUT 1 goes off. dL2

dL2dL2

dL2= 0

0 0

0 disables this function. Value in seconds, 0 to

250 s.

Add

AddAdd

Add

Adress – The parameter Add

Add 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

paspas

pas

Password - Enter the correct password to unlock write operations for the

parameters in the following levels.

[Al

[Al[Al

[Al

Calibration low - Offset value of the input. It adjusts the lower

measurement range of the sensor.

[Ak

[Ak[Ak

[Ak

Calibration High - Gain calibration. It adjusts the upper measurement

range of the sensor.

[JL

[JL[JL

[JL

Cold Junction Offset calibration - This parameter is available only for

thermocouple.

FA(

FA(FA(

FA(

Factory Calibration - Restores factory calibration parameters. Change

from 0 to 1 to restore the calibration parameters with factory values.

Prt

PrtPrt

Prt

Protection - Defines the levels of parameters that will be password

protected. See "Configuration Protection" for details.

Pa(

Pa(Pa(

Pa(

Password Change - Allows changing the current password to a new one.

Values from 1 to 999 are allowed.

Sn2

Sn2Sn2

Sn2

Serial number - First part of the electronic serial number of the instrument.

This is a read only parameter.

sn1

sn1sn1

sn1

Serial number - Second part of the electronic serial number of the

instrument. This is a read only parameter.

sn0

sn0sn0

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

Ac2Ac2

Ac2, described below:

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

OUTPUT 2 in the (nt

(nt(nt

(nt parameter, falls below the SP2

SP2 SP2

SP2 value.

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

value programmed in SP2

SP2SP2

SP2.

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

the range defined by:

(SP1

SP1SP1

SP1 – SP2

SP2 SP2

SP2) and (SP1

SP1SP1

SP1 + SP2

SP2 SP2

SP2)

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

outside the range defined by:

(SP1

SP1SP1

SP1 – SP2

SP2 SP2

SP2) and (SP1

SP1SP1

SP1 + SP2

SP2 SP2

SP2)

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.

In a multiple stage application, SP1

SP1SP1

SP1 and SP2

SP2SP2

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

dL1dL1

dL1 and

dL2

dL2dL2

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

PasPas

Pas When this parameter is presented, the correct password should be entered to allow

changes of parameters in the following levels.

Prt

PrtPrt

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(

PA(PA(

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

PASPAS

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

sn2sn2

sn2= 987; sn1

sn1sn1

sn1= 123; sn0

sn0sn0

sn0= 465 = 1 + 9 + 3 + 6

How to use the master password:

1- Enter the master password value at PaS

PaSPaS

PaS

prompt.

2- Go to PA(

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:

Overflow

Underflow

Sensor error

1 2

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