Indicator N1500G
NOVUS AUTOMATION
3/6
If an alarm situation occurs, the respective alarm status LEDs in the
front panel will light regardless of the relay alarm blocking status.
5.2.5.
Tare
This function is used to zero the display. The tare residual values is
subtracted or added to the total measured value. This function is
generally used with load cells and strain gauges and applies to linear
4-20 mA, 0-50 mV and 0-5 V inputs.
5.3.
PROCESS VARIABLE RETRANSMISSION
As an option, the indicator can be supplied with an isolated 0-20 mA
or 4-20 mA analog output for Process Variable (PV) retransmission.
The PV values which define the range of the 0-20 mA or 4-20 mA
retransmission can be programmed by the user in the
high and low
indication limits
.
Note – PV retransmission does not take an action of the special
Hold
and
Peak Hold
functions.
5.4.
CUSTOMIZED LINEARIZATION
The indicator features three types of input signals that allow for
custom linearization, this is, the user can configure the device in
order to obtain accurate indications for electrical signals with non-
linear and ever increasing characteristics. The three types of input
signal are:
c.0
c.0
c.0
c.0-
-
-
-50
50
50
50
,
c.4
c.4
c.4
c.4-
-
-
-20
20
20
20
and
c.0
c.0
c.0
c.0-
-
-
-5
5
5
5
. When selected, the indicator
creates the Custom Linearization Cycle.
The input signal must be divided in segments (maximum 19), defined
in order to minimize the error between the input signal and the
corresponding indication. In the
Custom Linearization
cycle
the user
finds the parameter
inp.01
inp.01
inp.01
inp.01
which corresponds to the start point of
the first segment and must set the minimum value of the input signal.
Then the parameter
ovt.01
ovt.01
ovt.01
ovt.01
that corresponds to the desired
indication for this first point. Soon after
inp.02
inp.02
inp.02
inp.02
which is the starting
point of the second segment and
ovt.02
ovt.02
ovt.02
ovt.02
the respective indication.
In
Inp.o1
Inp.o1
Inp.o1
Inp.o1
must always set the minimum value of the selected signal
type: 0.0 mV for
c.0
c.0
c.0
c.0-
-
-
-50
50
50
50
, 4.0mA for
c.4
c.4
c.4
c.4-
-
-
-20
20
20
20
and 0.0 V for
c.0
c.0
c.0
c.0-
-
-
-5
5
5
5
.
For linearization’s that do not require all 19 segments, simply set the
maximum value of the selected input type to the last required
segment. Note: The Lower Indication Limit and Upper Indication Limit
parameters must be set before these Custom Linearization settings.
In this mode the sampling rate is 4 measurements per second.
6.
INSTALLATION
6.1.
PANEL ASSEMBLY
The indicator is composed of two parts: the fixing base and the front
part with main circuits. The base must be removed from the front and
fixed onto a wall by means of four designed holes as shown in
Figure 1.
90
266
4X 4mm
3X 12mm
Figure 1
- Mounting the indicator in the panel cut-out.
The front part is only attached to the fixing base after all electrical
wire connections are done.
6.2.
ELECTRICAL CONNECTIONS
The internal electronics can be removed from the front panel without
any cable disassembly. The input signals and power connections are
shown in
Figure 2
.
Figure 2
- Back panel terminals
Note: The left side of the indicator is removable. It is fixed there
a label containing the connections.
6.2.1.
Recommendations for Installation
•
Input signal wires should be laid out away from power lines and
preferably inside grounded conduits.
•
Instrument mains (line) supply should be suitable for this purpose
and should not be shared.
•
In controlling and monitoring applications, possible consequences
of any system failure must be considered in advance. The internal
alarm relay does not warrant total protection.
•
RC filters (47
Ω
and 100 nF) are highly recommended for valve
and contactor coils, etc.
6.2.2.
Sensor or input signal connection
These connections should be properly done and terminals must be
well tightened. Thermocouples must be installed with proper
extension or compensation cables.
Pt100 RTDs must be 3-wire connected and the wires connected
should have the same electrical resistance (same wire gauge) for
correct cable length compensation. Four-wire RTDs can be
connected by disconnecting the fourth wire. Two-wire RTDs can be
connected by shortening terminals 7 and 8 and connecting the Pt100
to terminals 8 and 9.
7.
OPERATION
For best results this indicator requires correct setting of parameters
as input type (T/C, Pt100, 4-20 mA, etc), alarms actuation point,
alarm function, etc.
These parameters are divided in five levels or groups of parameters
which we will refer to as CYCLES.
Cycle
Access
1- Work
free access
2- Alarms
reserved access
3- Functions
4- Configuration
5- Calibration
Table 4
- Parameters Cycles
The work cycle has free access. All other cycles require a certain
combination of key strokes to be accessed. The combination is:
and
keys pressed simultaneously
