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.
5
High 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
off
until
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 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.
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
.