Rievtech PR-6DC-DA-R - Page 179

179
en
Loop error at the time n;
generally applies: e = SP –
PV
Refer to SP and PV
"
SP
The parameter SP is the set-value
assignment w. For this parameter you
can use the analog output of a
different special function.
-10,000 to +20,000
PV
PV is the process value x and is
calculated as follows:
PV = (analog value on input * gain) +
offset.
You can connect the input for
example by means of an analog input
with a PT100 sensor.
"
The gain parameter has an effect on
PV
0.0 to 10.0
The offset parameter has an effect on
PV
-10,000 to +20,000
PV is restricted by the parameters
Min. and Max.
In each case: -10,000 to +20,000
The Dir parameter gives the action
direction of the controller.
Positive means: If set value > process
value then the process value is
increased; if set value < process
value then the process value is
reduced.
Negative means: If set value >
process value then the process value
is reduced; if set value < process
value then the process value is
increased.
e.g. heat regulation: if the set value is
greater than the process value (room
is too cold), the manipulated variable
increases the process value.
- or +