Controller N1200
NOVUS AUTOMATION
4 / 13
The determination of the PID parameters (Pb, Ir and Dt) is described
in the item DETERMINATION OF PID PARAMETERS of this manual.
LBD - LOOP BREAK DETECTION ALARM
The parameter defines a time interval, in minutes, within which the
PV is expect to react to a control output signal. If the PV does not
react properly within the time interval configured in
lbd.t
, the
controller interprets this as a control loop break and signals this
occurrence in the display.
A LBD event may be sent to any I/O channel. Simply configure the
LDB
function to the desired I/O channel: the selected output will be
activated when a
LDB
condition is detected. When the
lbd.t
parameter is programmed with 0 (zero), the
LDB
function is disabled.
The
LDB
is useful in system supervision and troubleshooting, allowing
early detection of problems in the actuator, power source or load.
HBD - HEATER BREAK
DETECTION
Available in the products identified with the suffix HBD. Visit our web
site for further information
www.novusautomation.com
.
SAFE OUTPUT VALUE WITH SENSOR FAILURE
This function defines an output value (user defined) to be assigned to
the control output in the event of a sensor failure.
When the input sensor is identified as broken, the controller forcing
MV to assume the user configured value in the
1E.ov
parameter.
When the parameter
1E.ov
is configured with 0.0 (zero) value, this
function is disabled and the control output is simply turned off upon
input sensor error.
USB INTERFACE
The USB interface is used for CONFIGURING or MONITORING the
controller. The
NConfig
software must be used for the configuration.
It makes it possible to create, view, save and open configurations
from the equipment or files in your computer. The tool for saving and
opening configurations in files makes it possible to transfer
configurations between pieces of equipment and to make backup
copies. For specific models, the
NConfig
software also makes it
possible to update the firmware (internal software) of the controller
through the USB.
For MONITORING purposes you can use any supervisory software
(SCADA) or laboratory software that supports the MODBUS RTU
communication on a serial communications port. When connected to
the USB of a computer, the controller is recognized as a conventional
serial port (COM x). Use the
NConfig
software or consult the
DEVICE MANAGER in the Windows CONTROL PANEL to identify
the COM port that was assigned to the controller. Consult the
mapping of the MODBUS memory in the controller’s communications
manual and the documentation of your supervisory software to
conduct the MONITORING process.
Follow the procedure below to use the USB communication of the
equipment:
Download the
NConfig
software from our website and install it on
your computer. The USB drivers necessary for operating the
communication will be installed together with the software.
Connect the USB cable between the equipment and the
computer. The controller does not have to be connected to a
power supply. The USB will provide enough power to operate the
communication (other equipment functions cannot operate).
Open the
NConfig
software, configure the communication and
start recognition of the device.
The USB interface IS NOT SEPARATE from the
signal input (PV) or the controller’s/indicator’s digital
inputs and outputs. It is intended for temporary use
during CONFIGURATION and MONITORING
periods. For the safety of people and equipment, it
must only be used when the piece of equipment is
completely disconnected from the input/output
signals. Using the USB in any other type of
connection is possible but requires a careful analysis
by the person responsible for installing it. When
MONITORING for long periods of time and with
connected inputs and outputs, we recommend using
the RS485 interface, which is available or optional in
most of our products.
INSTALLATION / CONNECTIONS
The controller must be fastened on a panel, following the sequence
of steps described below:
Prepare a panel cut-out of 45.5 x 45.5 mm;
Remove the mounting clamps from the controller;
Insert the controller into the panel cut-out;
Slide the mounting clamp from the rear to a firm grip at the
panel.
RECOMMENDATIONS FOR THE INSTALLATION
All electrical connections are made to the screw terminals at the
rear of the controller. They accept wire sizes from 0.5 to 1.5 mm
2
(16 to 22 AWG). The terminals should be tightened to a torque
of 0.4 Nm (3.5 lb in)
To minimize the pick-up of electrical noise, the low voltage DC
connections and the sensor input wiring should be routed away
from high-current power conductors. If this is impractical, use
shielded cables. In general, keep cable lengths to a minimum.
All electronic instruments must be powered by a clean mains
supply, proper for instrumentation.
It is strongly recommended to apply RC'S FILTERS (noise
suppressor) to contactor coils, solenoids, etc.
In any application it is essential to consider what can happen when
any part of the system fails. The controller features by themselves
can not assure total protection.
ELECTRICAL CONNECTIONS
The controller's internal circuits can be removed without undoing the
connections on the back panel.
The controller complete set of features is drawn in
Figure 1
. The
features loaded in a particular unit are shown on its label
Figure 1
- Connections of the back panel
