NOVUS n1500lc - Manual (Page 3)

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4 PROCESS VARIABLE INPUT - PV
The process variable (PV) input type is configured through the frontal keypad according to the codes
shown in Table 1 (refer to INPUT TYPE parameter "in.typ"). All input types are factory calibrated
and no additional calibration is required.
Type Code Measurement Range
Non-linear 4-20 mA c.4-20
Non-linear 0-20 mA c.0-20
Linear 4-20 mA 4-20 a
Linear 0-20 mA 0-20 a
Linear 0 – 50 mV c. 50
Non-linear -20 a 20 mV c. -20
Non-linear 0 – 20 mV C. 20
Linear 0 – 50 mV 50
Linear -20 a 20 mV -20 . 20
Linear 0 –20 mV 20
Programmable indication range.
Three maximum range options:
-32000 to +32000
0 to 60000
0 to 120000 (only even values are shown)
Non linear signals will be linearized according to the
programmed custom linearization.
Table 1 - Input type codes
5 ALARMS
The indicator has 2 alarm outputs in the basic version and up to 4 alarms outputs optionally.
Each alarm has a corresponding LED message in the front panel to show alarm status.
5.1 ALARM FUNCTIONS
The alarms can be set to operate in seven different modes. These modes are shown in Table 2 and
described below. The alarm can also be set as ‘disabled’.
5.1.1 Sensor break - Ierr
The alarm is triggered whenever the sensor breaks or is badly connected.
5.1.2 Low alarm - Lo
The alarm relay is triggered whenever the measured value is below the alarm set point.
5.1.3 High alarm - Ki
The alarm relay is triggered whenever the measured value is above the alarm set point.
Differential low – Dif.lo
Deviation alarm. Alarm relay is triggered whenever the difference (deviation) between the Process
Variable and the reference value (AlrEF) is lower than the values defined in SP.AL. For this function,
the triggering point is defined as:
(ALrEF – SP.AL)
Differential High – Dif.ki
Deviation alarm. Alarm relay is triggered when the difference (deviation) between the Process
Variable value and the reference value (AlrEF) is greater than the value defined in SPAL. For this
function, the triggering point is defined as:
(ALrEF + SP.AL)
4.1.6 Differential (or Band) out of range – Dif.ov
Deviation alarm. Alarm relay is triggered when the difference (deviation) between the Process
Variable value and the reference value (AlrEF) has its modulus greater than the value configured in
SPAL. For this function, the triggering point is defined as:
(ALrEF – SP.AL) and (ALrEF + SP.AL)