10
6. Converter function
Caution
• The converter function is selectable only for the DC current output type.
• When using this controller as a converter, take 1 second into consideration since
input/output response time is approx. 1 second.
• When switching from converter function to controller function, the control parameter and
values set by converter function are held even if the function is switched to controller
function.
So, correct the control parameters and values which has been set by converter function to
the values necessary for the controller function after switching to the controller function
.
The converter function of this instrument converts each input (thermocouple, RTD, DC voltage and DC
current input) value to “4 to 20mA DC” using the control parameter of the controller, and outputs it.
When this instrument is used as a converter, follow steps (1) to (7) described below.
After steps (1) to (7) are finished, this instrument can be used as a converter.
(1) Wire this controller (Power supply, Input and Output).
(2) Turn the power of this controller ON.
(3) Enter “Auxiliary function setting mode 2” by pressing the
and
key (for approx. 3sec).
(4) Select the sensor type from “Input type selection (
)”.
(5) Set the high limit of the value that is going to be converted during “Scaling high limit setting (
)”.
(6) Set the low limit of the value that is going to be converted during “Scaling low limit setting (
)”.
(7) Select “Converter (
)” from “Controller/Converter function selection (
)”.
• To activate the alarm action by Converter function, set the alarm type to Process alarm.
If converter function is selected from “Controller/Converter function selection” in Auxiliary function setting
mode 2, the parameter below is automatically set. (Table 6-1)
However, this is applied only to the DC current output type.
(Table 6-1)
Setting item
Set value
Setting item
Set value
SV
Scaling low limit
Alarm value setting
0
Proportional band
100.0%
Loop break alarm action time
0 seconds
Integral time
0 seconds
Loop break alarm action span
0
Derivative time
0 seconds
Direct/Reverse action selection
Direct action
Manual reset setting
0.0
7. Running
After mounting and wiring in the control panel (DIN rail) are completed, operate the unit following the
procedures below.
(1) Turn the power supply to the KT7 Series ON.
For approx. 3sec after power is turned on, the character of the sensor type and temperature unit are
indicated on the PV display, and the input range high limit value is indicated on the SV display.
(If any other value is set during the scaling high limit value setting, SV display indicates it)
During this time, all outputs and LED indicators are in OFF status.
After that, PV display indicates actual temperature and SV display indicates the SV (main set value).
(2) Input each set value.
Input each set value, referring to “5. Setup”.
(3) Turn the load circuit power ON.
Control action starts so as to keep temperature of the control target at the SV.
