dl1
Dl2
Dl3
Delay 1, 2 and 3
- 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 controllers. Value in seconds, 0 to 250 s.
of1
Of2
Of3
Off time 1, 2 and 3
- 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
. 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
On2
On3
On time 1, 2 and 3
- 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.
2t1
3t1
Timer T1
Time interval
T1
for alarm temporization. Defines the temporization mode
and interval, as shown in Table 4. Adjustable from 0 to 1999 seconds.
Available only when outputs 2 or 3 are configured as alarms.
2t2
3t2
Timer T2
Time interval
T2
for alarm temporization. Defines the temporization mode
and interval, as shown in Table 4. Adjustable from 0 to 1999 seconds.
Available only when outputs 2 or 3 are configured as alarms.
Add
Address
- Controllers with the optional RS485 Modbus RTU communication
interface have the
Add
parameter at the Configuration level. Set a unique
Modbus address for each equipment connected to the network. Address range
is from 1 to 247.
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 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 temperature 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 controller electronic serial number.
sn1
Serial number
- Second part of the controller electronic serial number.
sn0
Serial number
- Third part of the controller electronic serial number.
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.
In a multiple stage application,
SP1,
SP2
and
SP3
are configured to operate at different
temperatures, creating a progressive sequence for turning on the outputs (compressors) in
response to a system demand.
The output delays for turning on the compressors (
dL1
,
dl2
and
dL3
) cause the
compressors to be turned on one by one, minimizing energy demand.
Another usage for multiple output controllers is in systems that require automatic selection
between cool and heat action. In these applications, one output is configured as reverse
action (heating) and the other as direct action (refrigeration).
Alarm Functions
There are eight distinct alarm functions implemented in OUTPUT 2 and 3, selected by the
parameter
Ac2
and
ac3
, described below:
2
- Low temperature alarm – OUTPUT is turned on when the measured temperature falls
below
the respective set point value.
3
- High temperature alarm – OUTPUT is turned on when the measured temperature
exceeds the respective set point value.
4
- Inside range alarm – OUTPUT 2 is turned on when the measured temperature is within
the range defined by:
(
SP1
–
SP2
)
and
(
SP1
+
SP2
)
or
(
SP1
–
SP3
)
and
(
SP1
+
SP3
)
5
- Outside range alarm: OUTPUT 2 is turned on when the temperature falls outside the
range defined by:
(
SP1
–
SP2
)
and
(
SP1
+
SP2
)
or
(
SP1
–
SP3
)
and
(
SP1
+
SP3
)
Functions
6
,
7
,
8
e
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.
Alarm Timer
Alarms can be configured for timed operation. Three operation modes can be programmed:
alarm delay, alarm timed pulse or alarm oscillator. Alarm temporization is available only for
outputs 2 and 3 and is configured through parameters: “
2t1
”, “
3t1
”, “
2t2
” and “
3t2
”.
Table 4 shows these advanced functions. Times T1 and T2 can be programmed from 0 to
1999 seconds. Programming 0 (zero) in the timer parameters T1 and T2 disables the timer
function.
The output status led P2 and P3 in the controller panel, signals when the control output is on.
Advanced
Function
T1
T2
ACTION
Normal Operation
0
0
Alarm Event
Alarm
Output
Delayed
0
1 to 1999 s
Alarm Event
Alarm
Output
T2
Pulse
1 to 1999 s
0
Alarm Event
Alarm
Output
T1
Oscillator
1 to 1999 s 1 to 1999 s
Alarm Event
Alarm
Output
T1
T2
T1
Table 4
– Timer Alarm Functions 1 and 2
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
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 password for a brand new device is
111
.
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:
Measured temperature exceeded maximum allowed range for the
sensor. Broken Pt100, Pt1000 or T/C. Short circuited NTC sensor.
Measured temperature is below minimum measurement range of the
sensor. Short circuited Pt100, Pt1000 or T/C. Broken NTC.
PRODUCT IDENTIFICATION
The label attached to the controller case identifies the model and the optional present in the
product, as described below:
MODEL:
N323 - A - B - C
, where:
A
: Input Sensor:
NTC
or
Pt100
or
Pt1000
or
J/K/T
(Thermocouples)
B
: Digital communication:
blank
or
485
(RS485, Modbus protocol)
C
. Voltage rating:
blank
(100-240 Vac/dc) or
24V
(24 Vac/dc);
TECHNICAL ASSISTANCE
If you encounter a problem with your controller, review the configuration with regard to inputs,
outputs, alarms, etc. If the problem persists, contact your supplier or Novus at
.
WARRANTY
Warranty conditions are available on our website
www.novusautomation.com/warranty
.
