Novus N322RHT User manual

TEMPERATURE AND HUMIDITY CONTROLLER
N322RHT
OPERATING MANUAL V1.7X H
Man 5001234
The N322RHT is a digital controller for relative humidity and temperature. Its 2 relay outputs can be
configured independently as control or alarm, either for temperature or relative humidity.
The humidity and temperature sensor, sold separately, is protected by a polyamide capsule and have 3 or
6 meters long cables.
The features of a particular model (mains supply, digital communication, etc) are identified by the label
placed on the controller body.
SPECIFICATIONS
Sensor Input: Humidity measurement
Range: 0 and 100 % RH;
Accuracy: Refer to Fig. 1;
Repeatability: ± 1 % RH;
Hysteresis:± 1 % RH;
Linearity error: << 1 % RH;
Stability: < 1 % RH / year;
Response time:Around 8 s to reach 63 % of a fast input change. Valid at 25 °C and 1 m/s airflow.
Sensor Input: Temperature measurement
Accuracy:Refer to Fig. 1;
Repeatability: ±0,1 °C;
Range: -20 and 100 °C;
Response time: up to 30 seconds in slow moving air.
Warm-up: ....................................................................................................................................... 15 minutes
Measurement resolution: RH: ..................................................................................... 1 %
T: ...................................................... 0.1º from –19,9 to 119.9º
Note: The equipment keeps its precision all over the range, despite the lack of display resolution in a part
of the range does not allow its visualization.
OUTPUT1: ................................................... Relay SPDT; 1 HP 250 Vac / 1/3 HP 125 Vac (16 A Resistive)
............................................................................................... Optional: Pulse, 5 Vdc, 25 mA max.
OUTPUT2:............................................................................................................. Relay: 3A / 250 Vac, SPST
POWER SUPPLY: Tension:........................................... 100~240 Vac/dc (± 10 %)
Optional: ..........................................24 Vdc/ac (12~30 Vdc/ac)
Frequency:................................................................. 50~60 Hz
Consumption: .................................................................... 5 VA
Dimensions: Width x Height x Depth: ............................................................. 75 x 33 x75 mm
Weight: ........................................................................................................ 100 g
Panel cut-out: ....................................................................................70 x 29 mm
Electronic module operating environment....................................................... 0 to 40 °C / 20 to 85 % UR
Sensor module operating environment: ...................................................... -20 to 100 °C / 0 to 100 % UR
Case: Polycarbonate UL94 V-2
Protection: box IP42, front panel IP65, sensors capsule IP40 (sold separately)
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.
Relative Humidity Accuracy at 25 °C
Temperature Accuracy
Sensor Operating Conditions
Fig. 1- RH and Temperature accuracies
IMPORTANT
The sensor used in this controller may be damaged or lose calibration if 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
and
0ft
, in
the configuration level of parameters.
ELECTRICAL WIRING
The figure below indicates the connection to the sensor, power supply and controller output, as well as a
connection example.
Fig. 2 – N322RHT terminals
Recommendations for installation
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
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
,
described below:
2
- Low alarm – OUTPUT 2 is turned on when the selected variable, as assigned for OUTPUT 2 in
the
(nt
parameter, falls below the
SP2
value.
3
- High alarm – OUTPUT 2 is turned on when the selected variable exceeds the value
programmed in
SP2
.
4
- Inside range alarm – OUTPUT 2 is turned on when the selected variable is within the range
defined by:
(
SP1
–
SP2
) and (
SP1
+
SP2
)
5
- Outside range alarm: OUTPUT 2 is turned on when the selected variable falls outside the
range defined by:
(
SP1
–
SP2
) and (
SP1
+
SP2
)
Functions
6
,
7
,
8
and
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.
Note: The action modes 6, 7, 8 and 9 are available to OUTPUT2 only when
(NT
is set to 0 or 3.
In a multiple stage application,
SP1
and
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
and
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.
OPERATION
The controller requires the internal parameters to be configured according to the intended use for the
instrument. The parameters are organized in 4 groups or levels:
Level Function
0 Measurement
1 Setpoint Adjustment
2 Configuration
3 Calibration
Upon power-up, the N322RHT display shows for 1 second its firmware version. This information is useful
when consulting the factory.
Then, the measured input variable is shown on the display. This is the parameter level 0(measurement
level).
To access level 1, press for 1 second until the “
SP1
” message shows up. Pressing again, the
“
SP2
” parameter is presented. To go back to level 0, press once more.
To access level 2 of parameters, press for 2 seconds until the “
RKT
” message is shown. Release the
key to remain in this level. Each new pressing on the key will advance to the next parameter in
the level. At the end of the level, the controller returns to the first level (0). Use the and keys to
alter a parameter value.
Notes: 1 A parameter configuration is saved when the key is pressed to advance to the next
parameter in the cycle. The configuration is stored in a non-volatile memory, retaining its
value when the instrument is de-energized.
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 – Setpoint Adjustment
In this level only the Setpoint (
SP1
and
SP2
) parameters are available, alternating the names with their
respective values. Adjust the desired value for each setpoint clicking on the and keys.
SP1
Set Point 1
Set Point adjustment for control OUTPUT 1.
SP1
value is limited to the values
programmed in
SPL
and
SPk
in the programming level (Parameter configuration,
level 2).
SP2
Set Point 2
Set Point adjustment for control OUTPUT 2.
SP2
value is limited to
the values
programmed in
SPL
and
SPk
Level 2 – Configuration - Parameters configuration Level
Contains the configuration parameters to be defined by the user, according to system requirements. Use
and keys to set the desired value. The display alternates the parameter name and respective
value.
rkt
RH - Temp
Defines how the variables, relative humidity and temperature, will be displayed:
0
Relative Humidity
1
Temperature
2
Toggles the indication every 2 seconds.
3
Toggles the indication every 3 seconds.
4
Toggles the indication every 4 seconds.
5
Toggles the indication 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 - Selects display indication for degrees Celsius or Fahrenheit.
0
- Temperature Celsius
1- Temperature in degrees Fahrenheit
0fk
Offset
Humidity
RH Offset - Offset value to be added to the displayed relative humidity to compensate
for sensor mismatches (when replacing a sensor, for instance). Adjustment range:
between –10.0 and 10.0 % of RH. Default value: 0.0
0ft
Offset
temperature
Temperature Offset - Offset value to be added to the measured temperature to
compensate for sensor mismatches. 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 SP2 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
sl1
.
ky1
Histeresis 1
OUTPUT 1 Hysteresis: defines the differential range between the
input variable value at
which the OUTPUT 1 is turned on and the value at which it is turned off. In degrees.
ky2
Histeresis 2
OUTPUT 2 Hysteresis
: defines the differential range between the input variable value at
which the OUTPUT 2 is turned on and the value at which it is turned off. In degrees.
Ac1
Action 1
Control action for OUTPUT 1 :
0
Reverse: For heating or humidification. Outputs turn on when variable is
lower than SP (See
(nt
parameter below).
1
Direct: For cooling or dehumidification. Output turns on when variable is
above SP.
2
Low (minimum value) alarm.
3
High (maximum value) alarm.
4
Low alarm with initial blocking.
5High alarm with initial blocking
Ac2
Action 2
Action 2 - Control OUTPUT 2 action or Alarm functions:
0
Reverse control action (heating or humidification). (See
(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
Control
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
Off time 1
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
. 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
to zero. Value in seconds, 0 to 999 s.
on1
on time 1
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
. 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 to zero. Value in seconds, 0 to 999 s.
dl1
Delay 1
Delay 1 - Delay time to start control. Upon power-on, control OUTPUT 1 is kept offuntil
the time programmed in
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
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
. 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
to zero. Value in seconds, 0 to 999 s.
on2
on time 2
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
. 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 to zero.
dl2
Delay 2
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
seconds. Also, OUTPUT 2 is driven off whenever OUTPUT 1 goes off.
dL2
=
0
disables this function. Value in seconds, 0 to 250 s.
Add
Address
Address – The parameter 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 adjusted and calibrated using traceable standards. 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.
(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. See
"Configuration Protection" for details.
Pa(
Password Change - Allows changing the current password to a new on
e. 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.
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
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
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
= 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 website www.novusautomation.com/warranty.