Super Systems 3 Series - Manual (Page 32)

Operations Manual Series 3
32
8. Temperature (or Process) Input
Parameters in the input list configure the input to match your sensor. These parameters provide the following features:
Input Type and
linearisation
Thermocouple (TC) and 3-wire resistance thermometer (RTD) temperature detectors
Linear input (-10 to +80mV). 0-10V using external voltage divider. mA assumes a 2.49Ω external
shunt.
See the table in section 8.1.1. 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 12Ω.
User calibration Either by simple offset or by slope and gain. See section 8.2. 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
8.1 Process Input Parameters
C with one decimal point.
INPUT LIST I N P U T
Name Scrolling Display Parameter Description Value Default Access Level
I N . T Y P INPUT TYPE Selects input linearisation and range See section 8.1.1. for input types available Conf
L3 R/O
U N I T S DISPLAY UNITS Display units shown on the
instrument none No units - only for custom linearisation o L3 C
o Celsius C
o Fahrenheit F
o Kelvin k
PErc %
D E C . P DISPLAY POINTS Decimal point position nnnn No DP nnnn Conf
L3 R/O
nnn.n One DP
nn.nn Two DP
RNG.HI RANGE HIGH
LIMIT Range high limit for thermocouple
RTD and mV inputs 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 From the low limit of the selected input type to the ‘High
Range Limit’ parameter minus one display unit. Conf
L3 R/O
PV.OFS
PV OFFSET A simple offset applied to all input
values.
See section 8.2. Generally one decimal point more than PV L3
F I L T . T FILTER TIME Input filter time OFF to 100.0 seconds 1.6 L3
C J . t y p CJC TYPE Configuration of the CJC type Auto Automa
tic Auto
0 o Fixed at
0
C
o C
S B . t y p
SENSOR BREAK
TYPE
Defines the action which is applied
to the control output if the sensor
breaks (open circuit).
See also section 8.1.2 50 o Fixed at 50 C
o C
on
Conf and if
T/C
L3 R/O
oFF No sensor break will be detected
on Open circuit sensor will be detected
C J C . i n
P v . i n
CJC
TEMPERATURE
PV INPUT VALUE
Temperature measured at the rear
terminal block. Used in the CJC
calculation
Current measured temperature
Lat
Latching
Conf
L3 R/O
and if
T/C
Conf
L3 R/O Conf
L3 R/O
Read
only
Minimu
m
display
to
maximu
m
display
range
m v . i n MILLIVOLT
INPUT VALUE Millivolts measured at the rear PV
Input terminals xx.xx mV - read only Conf
L3 R/O