Process Unit 73 LF - Knick

Process Unit 73 LF
0(4) mA
Output
2
Controller output Y [%]
100
ÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍ
50
ÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍ
0
ÍÍÍÍÍÍÍÍÍÍÍÍ
–50
Active
control range
Type C: Straightway valve (> setpoint)
For the straightway valve Type C, the analog controller
output operates in the manipulated variable
range 0 to -100 %. Here, -100 % corresponds to a
current of 20 mA.
The controller only outputs the manipulated variable
for the selected side. On the other side, the
setpoint of the manipulated variable cannot be
output and the output remains at 0 (4) mA.
20 mA
–100
0
50 100
Controlled variable X W [mS/cm]
The parameters of the controlled variable which
controls the controller are set with and .
Enter the setpoint and the neutral zone with the
scrolling and cursor keys (see Pg. 2–5) and confirm
the entries with .
Enter end of control, corner X, corner Y and reset
time for the right control range (: Controlled variable
> setpoint).
For a pure P-controller (reset time = 0 s), only the
parameters for the control range used must be
set. However, for the unused range, realistic
parameters must be entered, as otherwise the error
message “Warn Control Parameter” is output.
For use as a PI-controller (reset time 0 s), it is
mandatory that the parameters for the unused
range are also set. The manipulated variable of
both control ranges is influenced by the integration
time.
Feed Time Alarm
Open a Parameter Setting menu, select “Alarm
Settings” using , and confirm with .
Select “Feed Time Alarm” using and confirm
with . This menu item is only displayed if the
controller is turned on!
Enter the values for warning message (Warning
Limit Hi) and failure message (Failure Limit Hi)
using scrolling and cursor keys (see page 2–5)
and confirm your entries with .
9–40 Capabilities