Thermcraft XST-2-0-12-1V1-E28, Instruction Manual

Page: 71 / 260

3200 Series User Manual
Part No HA028651 Issue 11.0 July-12 39
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 2.49
Ω
external shunt.
See the table in section 0. 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 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
C with one decimal point.
8.1 Process Input Parameters
INPUT LIST I N P U T
Name Scrolling Display Parameter Description Value Default Access Level
IN . 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 IT S DISPLAY UNITS Display units shown on the
instrument none No units - only for custom linearisation o C L3
o C Celsius
o F Fahrenheit
o k Kelvin
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
M V. H I LINEAR INPUT
HIGH High limit for mV (mA) inputs -10.00 to +80.00mV 80.00 Conf
M V. Lo LINEAR INPUT
LOW Low limit for mV (mA) inputs -10.00 to +80.00mV -10.00 Conf
RNG.H I 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 IL T . T FILTER TIME Input filter time OFF to 100.0 seconds 1.6 L3
C J. typ CJC TYPE Configuration of the CJC type 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
S B . typ 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
oFF No sensor break will be detected on Conf
L3 R/O
on Open circuit sensor will be detected
Lat
Latching
C JC . i n CJC
TEMPERATURE Temperature measured at the
rear terminal block. Used in the
CJC calculation
Read only Conf
L3 R/O and
if T/C
P v. i n PV INPUT VALUE Current measured temperature Minimum display to maximum display range Conf
L3 R/O