Super Systems 3L Series - Manual (Page 23)

Series 3L Indicators
23
6. Process Input
Parameters in the input list configure the input to match your sensor. These parameters provide the following
features:-
Input Type and
linearization Thermocouple (TC) and 3-wire resistance thermometer (RTD) temperature detectors
Linear input (-10 to +80mV) through external shunt or voltage divider, mA assumes a
2.49
Ω external shunt.
See the table in section 6.1.1. for the list of input types available
Display units and
resolution The change of display units and resolution will all the parameters related to the process
variable
Input filter First order filter to provide damping of the input signal. This may be necessary to prevent
the effects of excessive process noise on the PV input from causing poor control and
indication. More typically used with linear process inputs.
Fault detection Sensor break is indicated by an alarm message ‘Sbr’. For thermocouple it detects when
the impedance is greater than pre-defined levels; for RTD when the resistance is less
than 12
Ω.
User calibration Either by simple offset or by slope and gain. See section 12.2. for further details.
Over/Under range When the input signal exceeds the input span by more than 5% the PV will flash
indicating under or over range. If the value is too high to fit the number of characters on
the display ‘HHHH’ or ‘LLLL’ will flash. The same indications apply when the display is
not able to show the PV, for example, when the input is greater than 999.9
o
C with one
decimal point.
6.1 Process Input Parameters
INPUT LIST I N P U T
Name Scrolling
Display Parameter Description Value Default Access
Level
IN.TYP INPUT TYPE Selects input linearization
and range See section 6.1.1. for input types available Conf
L3 R/O
UNITS DISPLAY
UNITS Display units shown on the
instrument none No units - only for custom
linearisation
o C L3
For a full list of units see section 6.1.2.
DEC.P DISPLAY
POINTS Decimal point position nnnnn - No decimal point to n.nnnn - four
decimal points nnnnn Conf
L3 R/O
INP.HI LINEAR
INPUT HIGH High limit for mV (mA) inputs
(1)
-10.00 to +80.00mV 80.00 Conf
INP.LO LINEAR
INPUT LOW Low limit for mV (mA) inputs
(1)
-10.00 to +80.00mV -10.00 Conf
RNG.HI RANGE HIGH
LIMIT Range high limit for
thermocouple RTD and mV
inputs
(1)
From the high limit of the selected input
type to the ‘Low Range Limit’ parameter
minus one display unit. Conf
L3 R/O
RNG.LO RANGE LOW
LIMIT Range low limit for
thermocouple RTD and mV
inputs
(1)
From the low limit of the selected input
type to the ‘High Range Limit’ parameter
minus one display unit. Conf
L3 R/O
(1) See section 6.1.3 for an example of how to adjust the above four parameters.
PV.OFS PV OFFSET A simple offset applied to all
input values.
See section 6.1.3. Generally one decimal point more than PV L3
FILT.T FILTER TIME Input filter time constant
(first order digital filter) OFF to 100.0 seconds 1.6 L3
FILT.D DISPLAY
FILTER Provides a filter for the
displayed value Off No display filter Off L3
1 Zero the least significant digit
2 Zero the two least significant digits
CJ.TYP CJC TYPE Configuration of the CJC
type
(only shown for
thermocouple inputs) Auto Automatic Auto Conf and if
T/C
L3 R/O
0 o C Fixed at 0 o C
50 o C Fixed at 50 o C
SB.TYP SENSOR
BREAK TYPE Defines the action which is
applied to the output if the
sensor breaks (open circuit) oFF No sensor break will be detected on Conf
L3 R/O
on Open circuit sensor will be
detected
Lat Latching
SB.DIR SENSOR
BREAK Defines the direction in
which the PV will range. up Up scale. Output goes to
maximum up Conf