LAC Ht40B, User Manual, Page: 16 / 30

16
6.1 Measurement
The right selection, the installation, the wiring, the location of sensor in the equipment and the corresponding setting of
parameters of the controller has the essential importance for the correct function. Parameters for the configuration of the
measurement input are in
configuration level , menu
InP1
.
Setting of input sensor
Set the corresponding input sensor in parameter
SEn1
. You will find the survey of input sensors in the chapter Technical
parameters , see page 28.
You can set the position of decimal point by parameter
dEC1
. For thermal sensors it is possible to display without decimal point
or with 1 decimal point.
Set the calibration of sensor with the parameter
CAL1
. The set value is added to process/measured value.
You can set the limit for set point value in configuration level , menu
SYS
, parameters
SP1L
and
SP1h
.
Important:
•
Thermocouple and RTD inputs have the detection of improperly wired sensor. When the sensor is open or broken, the
control output is turned OFF, the alarm output is activated.
Measuring range of process inputs
In configuration level , menu
InP1
, you can define the measuring range of the process inputs with parameters
rL 1
,
rh 1
and
dEC1
.
Example of setting process input:
You want the input signal 4 to 20 mA to be displayed in the range 6.0 to 24.0.
Set
dEC1
=
0.0
,
rL 1
= 6.0 a
rh 1
= 24.0. The distribution between the values 6.0 and 24.0 will be linear.
6.2 Controlling, the control output
You can select in the controller ON/OFF or PID controlling for heating. If PID controlling is set, you can use the autotuning of
PID parameters, see page
9 and the power limit function, see page 17.
The parameters for configuration of the control output 1 are in configuration level , menu
out1
.
ON/OFF controlling
ON/OFF control is selected by setting
ot1
=
ht2
. It is used for less exacting application. It is not possible to achieve zero
hysteresis value on principle. The process value rises and drops about set point value in the characteristic way.
Displaying
Of process
value
Input signal 4 mA 20 mA
6.0
24.0
Procees
value
time
Stp value
hysteresis
State of
control
output
time
ON
OFF