N1500LC Indicator
NOVUS AUTOMATION
2/7
ALARMS
The indicator has 2 alarm outputs in the basic version and up to 4
alarms outputs optionally.
TYPE
PROMPT
ACTION
Disabled
Off
Alarm disabled
Open Semsor (
i
nput
Err
or
)
ierr
Alarm will go ON if sensor breaks
High Alarm
(
Lo
w
)
Lo
Alarm SP
PV
High Alarm
(
Hi
gh
)
Ki
Alarm SP
PV
Differential Low
(
diff
erential
Lo
w
)
Dif.lo
PV
ALreF
ALreF + Deviation
Differential High
(
diff
erential
Hi
gh
)
Dif.ki
PV
ALrEF + Deviation
ALrEF
Differential out of
range
(
dif
erencial
F
ora)
Dif f
PV
ALrEF + Deviation
ALrEF
ALrEF - Deviation
Differential within
range
(
diff
erential
With
in)
Dif d
PV
ALrEF + Deviation
ALrEF
ALrEF - Deviation
Table 2
- Alarm basic functions
Each alarm has a Warning Light in the front panel that shows when it
was activated.
Alarm Functions
The alarms can be set to operate in six different modes: Open
Sensor, Low alarm, High alarm, Differential low, Differential High or
Differential (Band). These modes are shown in
Table 2
and
described below.
Open Sensor
The alarm is triggered whenever the sensor breaks or is badly
connected or broken.
Low Alarm
The alarm relay is triggered whenever the measured value is
below
the alarm set point.
High Alarm
The alarm relay is triggered whenever the measured value is
above
the alarm set point.
Differential (or Band) out of range
For Differential alarm it is necessary to define two parameters:
Differential Alarm Reference Value (
ALrEF
) and Alarm Differential
Setpoint (Deviation).
The Differential out of range alarm occurs when the measured value
is outside the range defined by:
(
ALrEF
- Deviation)
and
(
ALrEF
+ Deviation)
Differential (or Band) within range
Same as previous, but acting within the range defined above.
Differential Low
Triggered whenever the measured value is
below
the set point by:
(
ALrEF
- Deviation)
Differential High
Triggered whenever the measured value is
above
the set point by:
(
ALrEF
+ Deviation)
Alarm Timer
The N1500LC allows programming of the Time Setting of Alarms,
being able to set delays in alarm condition; send a single pulse at the
time of trigger; or allow the generation of sequential pulses.
Table 3
shows these advanced functions. Times T1 and T2 can be
programmed from 0 to 6500 seconds and are defined when setting
up the device. For alarms with no time delays, set T1 and T2 with
value 0 (zero).
The Warning LEDs associated with the alarm always light up when
the alarm condition occurs, regardless of the current state of the
output relay, which may be de-energized momentarily due to a time
delay.
Advanced
Function
T1
T2
ACTION
Normal
Operation
0
0
Alarm Event
Alarm
Output
Delayed
0
1 s to
6500 s
Alarm Event
Alarm
Output
T2
Pulse
1 s to
6500 s
0
Alarm Event
Alarm
Output
T1
Oscillator
1 s to
6500 s
1 to 6500
s
Alarm Event
Alarm
Output
T1
T2
T1
Table 3
- Timer Alarm Functions
Initial Block Alarm
The initial blocking option inhibits the alarm from being recognized if
an alarm condition is present when the controller is first energized.
The alarm will be triggered only after the occurrence of a non alarm
condition followed by a new occurrence for the alarm. The initial
blocking is disabled for the sensor break alarm function.
SPECIAL FUNCTIONS
SPECIAL FUNCTION KEY AND DIGITAL INPUT
The
key (special function key) in the frontal panel of the
controller as well as the Digital Input may be assigned different
functions that will be chosen by the user during the setup. The
possible functions are:
zero
– Zero Function
Available only for the
key. It resets the scale. This function is
used to eliminate the influence of interference or small deviations in
the zero of a scale. Reset is only accomplished if the value shown in
the scale is within 2% of the end of scale. Zero is not lost if the scale
is turned off.
Note
: This function can be performed automatically using the
parameters
En
A.z
and
A.Z.rAn
.
Lo
– Displays Minimum
Set the
key, to at the first tap, displays the
minimum (Low)
value
the indicator measured since the last reset. On the second tap to show
the maximum (High) measured by the indicator since the last reset. On
the third ring, returns to normal display. Press the button for more than 5
seconds to reset, and the minimum and maximum values will be
erased, starting a new cycle.
xi
– Displays Maximum
Displays the
maximum (High)
value the indicator measured since
the last reset
.
Pkold
– Maximum value
The indicator will automatically work in the
Peak Hold
mode
whenever the
key or the Digital Input are programmed as
“
PkoLd
”.
This mode of operation mode the indicator always shows the
maximum value measured, since the last time the
key or the
Digital Input were pressed.
Each activation of the
key or digital input triggers a new Peak
Hold cycle, reinitializing the reading of the display to the current value
of the measure.