Process Unit 73 LF - Knick

Process Unit 73 LF
Pulse Length Controller
(with option 353 only)
The pulse length controller controls valves used
as actuators.
closed
Contact
open
ON
time
Period
The pulse length controller switches the contacts
on, the ON time depending on the controller output.
The period is constant. It can be separately defined
for each of the two control ranges to adjust for
two different valve types, for example.
A minimum ON time is maintained even if the controller
output takes corresponding values. This
helps to allow for the reaction time of a valve, for
example.
If you define a minimum ON time of 0 s, for technical
reasons a minimum ON time of 0.25 s is effective.
Pulse Frequency Controller
(with option 353 only)
The pulse frequency controller controls (frequency
controlled) feeding pumps used as actuators.
closed
Contact
open
ON time
60/(max. pulse frequency) [s]
The pulse frequency controller varies the frequency
at which the contacts are switched on.
You can define a maximum pulse frequency
[p/min]. It depends on the feeding pump in use.
The maximum value to be entered is 120 p/min.
ON time is constant.
It is automatically calculated from the user-defined
maximum pulse frequency:
ON time [s] = 30 / max. pulse frequency [p/min]
How to configure the digital controller
Open a Parameter Setting menu, select “Limits/
Controller” using , and confirm with .
Press to select “Controller” and confirm with
.
Press or to open the “Controller” submenu.
Press or to select the controller type and
confirm with .
To set the control parameters, press or
to open the “Control Parameters” submenu.
9–36 Capabilities