N1500LC Indicator
NOVUS AUTOMATION
3/7
rSt
- Clears Maximum and Minimum
If configured with “
rSt
”, each activation of the
key or digital input
clear the memory for a new cycle of maximum and minimum values.
kold
– Freeze Measured Value
The
hold
function freezes the measured value showed in the display.
Each time the
key or the Digital Input is selected, there is a
change from
hold
to normal mode.
Whenever the indicator is in the
hold
mode, the message “
koLd
” will
be displayed so that the operator will be aware that the value
displayed is the frozen value and not the current reading.
tarE
– Tare Function
It
is available only in the Digital Input
configuration or through the
key. It changes indication to zero (0000.0), regardless of the
value applied to the input. It is used to eliminate indications of defined
values. In order to eliminate the tare, the user must press the
key.
AND
KEYS
The same
Tare
function available for the Digital Input can be quickly
applied by using the
key, which does not need to be set up. The
key is used to eliminate the tare applied.
The indicator accepts successive tares provided that the input signal
(gross weight) does not exceed the equipment end of scale.
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.
Available at terminals 29 and 30 of the rear panel of the device.
When this option is available, the retransmission is always enabled
and does not require any user intervention.
The PV values that define the scale of the 0 mA / 4 mA to 20 mA
retransmission can be programmed by the user in the
high and low
output limits
(
0v.lol
e
0v.kol
),at configuration level. These limits
can be defined freely, and you can make a retransmission with
increasing or decreasing behavior toward to the indicated value.
For a voltage output signal an external shunt (calibrated resistor)
should be installed at the analog output terminals, according to your
needs.
LOAD CELL POWER SUPPLY (AUXILIARY P. S.)
The indicator provides a voltage power supply of 10 Vdc to excite
field transmitters with 50 mA current capacity. Available at the back
panel terminals 16 and 17.
CUSTOMIZED LINEARIZATION
The indicator has five types of input for non-linear signals:
c.4-20
,
c.0-20
,
c.50
,
c.-20
e
c.20
For using these signals is necessary to adopt the
Custom
Linearization
option. This feature combines the input signal to 30
user-defined line segments; setting two points for each segment, a
start and end and the respective display values. Thus the indication
will have a non-linear behavior set by the input signal.
The following figure shows an input signal associated with four line
segments (
a
,
b
,
c
, and
d
) causing that the resulting indication can be
approximated to the ideal value (characteristic curve). The resulting
indication is as best as the best straight segments are chosen.
Figure 2
– Custom linearization for a nonlinear signal.
Note
: The non-linear input signal shall have
increasing
pattern.
CONFIGURATION PROTECTION
As a safety measure, parameter changes can be prevented through a
key combination performed at each level. With this protection, the
parameters are still displayed but cannot be changed.
To protect any level, just go to the level and press the keys
and
simultaneously for 3 seconds.
To unlock the level, press the keys
and
for 3 seconds.
The display will flash briefly to confirm locking or unlocking
level.
Inside the controller, the
PROT
key complements the protection
function. In the
OFF
position, the user can do and undo the protection
of cycles. In the
ON
position cannot make changes, if there are
protections cycles these cannot be removed; if there is not, they
cannot be promoted.
INSTALLATION
The indicator is designed to be panel mounted. Remove the two plastic
fixing clamps from the instrument, insert the unit into the panel cut-out
and slide firmly the fixing clamps from the rear against the panel.
Recommendations for installation
•
The wires of the input signals must be installed separated from
the output wires and power, if possible, in grounded conduits.
•
The power supply for the instruments must be provided from an
exclusive power source.
•
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.
•
Use of RC FILTERS (47 R and 100 nF, serial) are highly
recommended when driving solenoids, contactor coils or other
inductive loads.
ELECTRICAL CONNECTIONS
The whole inner part can be removed without the need to make any
disconnection.
Figure 3
shows the connection arrangement at the rear
panel of the indicator.
Figure 3
– Back Panel Terminals
Power Connection
First check if the voltage required by the indicator is compatible with
the voltage of instrument power supply. Provide adequate protection
devices.
Figure 4
– Power Connection
