TEMPERATURE AND HUMIDITY CONTROLLER
N323RHT
OPERATING MANUAL - V1.8x B
The 323RHT is a digital controller for relative humidity and temperature with three relay outputs
Relative Humidity Accuracy @ 25 °C
Temperature Accuracy
Sensor Operating Conditions
TIMER FUNCTION
T1
T2
ACTION
Normal operation
0
0 Delayed activation
0
1 to 1999 s
Temporary activation
1 to 1999 s
0 Sequential activation
1 to 1999 s
1 to 1999 s
Level
Function
0
Measurement
1
Setpoints Adjustment
2
Configuration
3
Calibration
Alarm Event
Alarm
Output
Alarm Event
Alarm
Output
T2
Alarm Event
Alarm
Output
T1
Alarm Event
Alarm
Output
T1
T2
T1
configurable independently for control or alarm. Timer functions are available to all three outputs.
A Relative Humidity and Temperature 3-meter probe is bundled with the instrument. The sensor is
protected by a polyamide capsule.
The features of a particular model (input sensor type, sensor range, mains supply, etc) are i dentified by
the label placed on the controller body.
SPECIFICATIONS
INPUT SENSOR: Humidity measurement
Range: 0 and 100 % (RH) (see Fig. 1);
Accuracy: See Fig. 1; Repeatability: ± 1 % RH;
Hysteresis: ± 1 % RH;
Linearity error: << 1 % RH;
Stability: < 1 % RH / year;
Response time: 4 seconds in the range from 10 to 90 %, with slow moving air. Outside
INPUT SENSOR: Temperature
Accuracy: Refer Fig. 1; Repeatability: ±0.1 °C;
Range: -40 and 120 °C (see Fig. 1);
Response time: up 30 seconds in slow moving air;
WARM-UP: ................................................................................................................................... 15 minutes
MEASUREMENT RESOLUTION: RH: ..................................................................................... 1 %
OUTPUT1: ........................................................... Relay SPDT; 1 HP 250 Vac / 1/3 HP 125 Vac (16 A Res.)
.................................................................................. Optional: Pulse, 5 Vdc, 25 mA max.
OUTPUT2: ...................................................................................................... Relay: 3 A / 250 Vac, SPST-NA
OUTPUT3: ...................................................................................................... Relay: 3 A / 250 Vac, SPST-NA
POWER SUPPLY: Tension: ........................................... 100 to 240 Vac/dc 10 %
Optional: ............................................................... 12 to 30 Vdc
Frequency:................................................................. 50~60 Hz
Consumption: .................................................................... 5 VA
Dimensions: Width x Height x Depth: ........................................................... 75 x 33 x 75 mm.
Weight: ........................................................................................................ 100 g
Panel cut-out: .................................................................................... 70 x 29 mm
Instrument operating environment: ................................................................... 0 to 40 °C / 20 to 85 % RH
Probe operating environment: .................................................................... -10 to 100 °C / 0 to 100 % RH
Case: Polycarbonate UL94 V-2, Protection: Box IP42; Front panel: IP65
Suitable wiring: Up to 4.0 mm²; RS-485 digital communication; RTU MODBUS protocol (Optional)
Serial interface not isolated from input circuitry.
Input circuitry isolated from power supply, except in the 24 V powered model.
IMPORTANT
The sensor used in this controller may be damaged or lose calibration if it is exposed to aggressive
atmospheres with high concentrations as Chloride Acid, Nitride Acid, Sulphuric Acid or Ammonia.
Acetone, Ethanol and Propylene Glycol may cause reversible measurement drifts.
Fine trimming in the indication of RH and Temperature are available at the parameters 0fk e 0ft, in the
configuration level of parameters.
this range, up to 48 hours.
T: ...................................................... 0.1º from –19.9 to 119.9º
Fig. 1 – RH and temperatures accuracies
Man 5001276
ELECTRICAL WIRING
The figure below indicates the connection to the sensor, power supply and controller output, as well as a
connection example.
Fig. 2 – N323RHT terminals – Relays share a common terminal (standard model)
It is important to follow the recommendations below:
The humidity sensor Conductors shall go through the system plant separately from the control and
feeding output conductors, if possible in grounded electrical ducts.
The controller feeding shall be preferably provided from a proper instrumentation network with a
phase different from the one used for the control output.
It is recommendable to use RC FILTERS (47 R and 100 nF, series) in contactor coils, solenoids, etc.
WORKING WITH THE CONTROLLER
The controller operates on the outputs OUTPUT1, OUTPUT2 and OUTPUT3 to lead the measured
variable (temperature or humidity) to the intended value, defined by the setpoint (SP1 , SP2 and SP3).
OUTPUT1, OUTPUT2 and OUTPUT3 can operate either as control outputs, when they operate directly on
the system load (resistance, compressor, humidifier, etc.) or as alarm outputs that operate notifying the
operator about the occurrence of any specific situation, defined by the user. The operation modes are
presented below and they can be defined on parameters a(1, a(2 and A(3 .
0- Reverse control action.
Activates the corresponding OUTPUT when the process variable (RH or temperature) is below the
setpoint of that output. Normally used for heating control.
1- Direct control action.
Activates the output whenever the process variable is above the setpoint for that output. The direct
action is used for refrigeration control.
2- Low Alarm.
Minimum value alarm, indicates that the process value is below the alarm setpoint defined for the
output.
3- High Alarm.
Maximum value alarm, indicates that the process is above the alarm setpoint defined for that output.
4- Low alarm with initial blocking.
Identical to the Low Alarm, with the addition of the initial blocking feature explained in Note 2 below.
5- High alarm with initial blocking.
Identical to the High Alarm, with the addition of the initial blocking feature explained in Note 2 below.
6- Inside Range Alarm.
Activates the output when the process variable is within the interval defined by:
(SP1 – SP2) and (SP1 + SP2) or (SP1 – SP3) and (SP1 + SP3 )
7- Outside Range Alarm.
Activates the output when the process variable is outside the interval defined by:
(SP1 – SP2) and (SP1 + SP2) or (SP1 – SP3) and (SP1 + SP3)
8- Inside the range alarm with initial blocking.
Identical to the inside the range alarm with the addition of the initial blocking feature, describe in
Note 2 below.
9- Outside the Range Alarm With Initial Blocking.
Identical to the outside the range alarm with the addition of the initial blocking feature, describe in
Note 2 below.
Note 1: The action modes 6, 7, 8 and 9 are available to OUTPUT 2 and OUTPUT 3 only. For OUTPUT 2
when (NT = 0, 1, 6 or 7. For OUTPUT 3 when (NT = 0, 2, 5 or 7.
Note 2: The Initial Blocking feature inhibits the alarm from being recognized if an alarm condition is
present when the controller is first energized. The alarm will be enabled only after the occurrence of a
non-alarm condition followed by a new occurrence for the alarm.
The Initial Blocking impedes (blocks) the alarm from being switched on in the beginning of the
control process. The alarm will only be unblocked after the passage of the variable measured by a non-
alarm condition. This feature is useful when, for example, a minimum alarm is programmed in a heating
process. Without the blocking, the process would start with an enabled alarm until the control setpoint is
achieved.
Output Timing
The controller allows for the Output Timing programming, where the user can establish three conditions:
output tripping delay, temporary activation and sequential activation.
The timing is available only for outputs 1, 2 and 3 and is programmed by means of the “1t1 ”, “2t1”,
“3t1”, “1t2” “2t2” and “3t2”.
The figures below represent these functions; T1 and T2 can vary from 0 to 1999 seconds and their
combinations determine the timing mode. For normal operation of the alarms, without timing, program 0
(zero).
On the front panel, the controllers P1, P2 and P3 light when the respective outputs are activated. During
the delay, the respective signaler remains flashing.
Table 1 – Timer alarm functions 1, 2 and 3
OPERATION
The controller shall be set up by the user before using. This consideration consists in the definition of the
values for the various parameters that determine the equipment operation mode.
These set up parameters are organized in groups or Levels, called parameter levels.
Upon power-up controller, the controller display shows for 1 second its firmware version. This information
is useful when consulting the factory.
Then, the temperature measured by the sensor is shown on the display. This is the parameter level 0 or
Temperature Measurement level.
For access to level 1 press for 1 second till the “SP1” parameter appears. Press again to go
back to the temperature measurement level.
To access level 2 of parameters, press for 2 seconds until the “rkT” message is shown. Release the
key to remain in this level. Press again to access other parameters from this level. After the last
parameter, the controller goes back to the temperature measurement level.
To change the parameters values, use the keys and until the achievement of the desired values.
Notes: 1 The programming is saved by the controller when the latter goes from one parameter
to the other and only then it is considered valid. The programming is stored in a
permanent memory, even if there is a power supply interruption.
2 If no keyboard activity is detected for over 20 seconds, the controller saves the current
parameter value and returns to the measurement level.
Level 1 – Setpoints Adjustment
SP1
Set Point 1
Set point adjustment for control OUTPUT 1. The setting range is limited by the values
in SL1 and Sk1 (this parameter belong to the Configuration level).
SP2
Set Point 2
Set point adjustment for control OUTPUT 2. The setting range is limited by the values
in SL2 and Sk2.
SP3
Set Point 3
Set point adjustment for control OUTPUT 3. The setting range is limited by the values
in SL3 and Sk3.
rkt
RH - Temp
Defines how the variables, relative humidity and temperature, will be displayed:
0 Humidity
1 Temperature
2 Toggles the indications of relative humidity and temperature every 2 seconds.
3 Toggles the indications of relative humidity and temperature every 3 seconds.
4 Toggles the indications of relative humidity and temperature every 4 seconds.
5 Toggles the indications of relative humidity and temperature every 5 seconds.
For options 0 and 1, a fast click on the , key forces the other variable to be
displayed for 10 seconds.
Unt
Unit
Temperature Unit - Allows the user to choose the measured temperature presentation
unit.
0 Temperature in degrees Celsius.
1 Temperature in degrees Fahrenheit
0fk
Offset Humidity
Correction value for humidity indication. Allows the user to perform small adjustments on
the relative humidity indication, trying to correct measurement errors that appear, for
example, in the sensor replacement. Adjustment range: between –10.0 and 10.0 % of
RH. Default value: 0.0
0ft
Offset
temperature
Correction value for Temperature indication. Allows the user to perform small adjustments
on the relative temperature indication, trying to correct measurement errors that appear,
for example, in the sensor replacement. Adjustment range: between –10.0 and 10.0 % of
RH. Default value: 0.0
Sl1
SP Low Limit 1
Lower limit value for SP1 (minimum value with which SP1 can be configured). Sl1
must be programmed with a lower value than sK1.
Sk1
SP High Limit 1
Upper limit for Sp1 (maximum allowed value for Sp1). sK1 must be programmed with
a value lower than the one configured in sl1 .
Sl2
SP Low Limit 2
Lower limit value for SP2 (minimum value with which S P2 can be configured). Sl2
must be programmed with a lower value than sK2.
Sk2
SP High Limit 2
Upper limit for Sp2 (maximum allowed value for Sp1). sK2 must be programmed
with a value lower than the one in sl2.
Sl3
SP Low Limit 3
Lower limit value for SP3 (minimum value with which S P3 can be configured). Sl3
must be programmed with a lower value than sK3.
Sk3
SP High Limit 3
Upper limit for Sp3 (maximum allowed value for Sp3). sK3 must be programmed
with a value lower than the one in sl3.
Ac1
Action 1
Control action for OUTPUT 1:
0 Reverse: For heating or humidification;
1 Direct: For cooling or dehumidification;
2 Low (minimum value) alarm;
3 High (maximum value) alarm;
4 Low alarm with initial blocking;
5 High alarm with initial blocking.
Ac2
Action 2
Control OUTPUT 2 and OUTPUT 3 action:
0 Reverse control action (heating or humidification);
1 Direct control action (cooling or dehumidification);
2 Low (minimum value) alarm;
3 High (maximum value) alarm;
4 Low alarm with initial blocking;
5 High alarm with initial blocking;
6 Alarm inside the range;
7 Alarm outside the range;
8 Inside the range alarm with initial blocking;
9 Outside the range alarm with initial blocking;
10 Free Timer (available only for AC3).
The section Working With The Controller describes how these functions work.
Ac3
Action 3
(nt
Control
Defines the outputs positioning in relation to the variables.
0 OUTPUT 1 = RH; OUTPUT 2 = RH and OUTPUT 3 = RH
1 OUTPUT 1 = RH; OUTPUT 2 = RH and OUTPUT 3 = Temperature
2 OUTPUT 1 = RH; OUTPUT 2 = Temperature and OUTPUT 3 =RH
3 OUTPUT 1 = RH; OUTPUT 2 = Temperature and OUTPUT 3 =Temperature
4 OUTPUT 1 = Temperature; OUTPUT 2 = RH and OUTPUT 3 = RH
5 OUTPUT 1 = Temperature; OUTPUT 2 = RH and OUTPUT 3 = Temperature
6 OUTPUT 1 = Temperature; OUTPUT 2 = Temperature and OUTPUT 3 = RH
7 OUTPUT 1 = Temperature; OUTPUT 2 = Temperature and OUTPUT 3 =
Temperature
Ky1
Ky2
Ky3
Hysteresis
Control hysteresis: Differential between the point of switching on and off the relay of
the output, set up as a control output.
Adjustable between 0.1 and 50.0.
dli
dl2
dl3
Delay
Time of delay for starting the control. After the controller has been switched on, the
output (1, 2 or 3) will only be switched on when the time programmed in this
parameter has passed. Used in large refrigeration systems to impede simultaneous
routing of compressors upon recovery of power supply interruption.
Value in seconds, 0 to 250 s.
Of1
of2
of3
Off time
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. This parameter is useful in
extending compressor life in refrigeration systems. For heating systems, program
of1 to zero.
Value in seconds, 0 to 999 s.
on1
on2
on3
on time
Defines the minimum on time for control OUTPUT 1. Once turned on, OUTPUT 1
remains so for at least the time programmed in on1. This parameter is intended for
refrigeration systems where increased compressor life is desired. For heating
systems, program on1 to zero. Value in seconds, 0 to 999 s.
Value in seconds, 0 to 999 s.
1t1
2t1
Timer T1
Time interval T1 for alarm temporization. Defines the temporization mode and
intervals, as shown in Table 1. Not available when outputs 1 and 2 are configured as
direct action. Adjustable from 0 to 1999 seconds.
3t1
Timer T1
Time interval T1 for temporization. Defines the temporization mode and intervals for
OUTPUT 3 (see Table 1). Not available when OUTPUT 3 is configured as direct
action. Adjustable from 0 to 1999 seconds. If AC3 is configured as Free Timer, the
unit of time is given in minutes.
Timer output activation duration (timer).
1t2
2t2
Timer T2
Time interval T2 for alarm temporization. Defines the temporization mode and
intervals, as shown in Table 1. Not available when outputs 1 and 2 are configured as
direct action. Adjustable from 0 to 1999 seconds.
3t2
Timer T2
Time interval T2 for temporization. Defines the temporization mode and intervals, as
shown in Table 1. Not available when OUTPUT 3 is configured as direct action.
Adjustable from 0 to 1999 seconds. If AC3 is configured as Free Timer, the unit of
time is given in minutes.
Interval between the timer output activation operations (timer).
Add
Address
The controllers with incorporated serial communication interface RS485 present the
parameter Add in their programming level. In this parameter, the user defines a
communication address for each network element. The defined address shall be
between 1 and 247.
pas
Password - Enter the correct password to unlock write operations on the parameters
in the following levels.
(rk
RH Calibration low. Offset calibration for RH.
(tp
T Calibration low. Offset calibration for Temperature.
Prt
Protection - Defines the levels of parameters that will be password protected.
Pa(
Password Change - Allows changing the current password to a new one. Values
from 1 to 999 are allowed.
Sn2
Shows the first two digits of the controller electronic serial number.
sn1
Shows the three central digits of the controller electronic serial number.
sn0
Shows the three last digits of the controller electronic serial number.
Indicates that: the measurement exceeded the upper level of the sensor range.
Possible sensor problem.
Indicates that: the measurement exceeded the lower level of the sensor range.
Possible sensor problem.
Sensor problem. Revise sensor wiring. If problem persists, contact the factory.
This level contains the 3 setpoints, SP1, SP2 and SP3. They define the RH and the temperat ure for the
process. The display shows the parameter name alternating with the current value. Set the desired value
by pressing the keys and .
Level 2 – Configuration Level
Presents a sequence of other parameters that shall be defined by the user. The parameters are shown
alternately with the respective values. In order to obtain the desired values, use the keys and .
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 3 seconds.
In case of accidental access, the keys and shall not be pressed; Just pass through all
parameters, till the controller goes back to the measuring screen.
ERROR MESSAGES
The controller shows messages on the display that correspond to the problems related to the humidity
measurement. The control output relay is immediately switched off, when they are shown.
Note 3: The correct use of the delays dL1 and dL2 contributes to a smooth start-up following a energy
fail; the compressors will be turned on in sequence, according to the programmed temporization, reducing
the energy demand after power-up.
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 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 dig it of SN2 ] + [h igher digi t of S N1 ] + [highe r digit of SN0 ]
For example the master password for the device with serial number 987123465 is: 1 9 3 6
As follows: 1 + sn2= 987; sn1= 123; sn0= 465 = 1 + 9 + 3 + 6
How to use the master password:
1- Enter the master password value at PaS prompt.
2- Go to 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.
WARRANTY
Warranty conditions are available on our web site www.novusautomation.com.
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