KROHNE OPTISENS PAC 050 EN - Manual (Page 20)

Manual OPTISENS PAC 050
OPTISENS PAC 050 20
For a pulse-pause controller you have to set the following parameters:
1) Set points S1 and S2
S1 refers to relay 1, S2 refers to relay 2.
2) P range and integral action time
Adjust a P range > 0. For a P controller set integral time = 0, for a PI controller set an integral time > 0.
3) Pulse-frequencies for S1 and S2
Both frequencies must be set to 00, otherwise the controller will act as an impulse-frequency controller.
4) The acting direction for S1 and S2
Select „raise“ if the dosage raises the measured value.
Select „lower“ if the dosage lowers the measured value.
5) Pulse + pause time
Define a period of time during which the relay is proportionally to the control deviation ON (pulse) or OFF
(pause), respectively.
6) Least pulse time
Set a minimum pulse time that the relay has to at least remain open to allow the actuator to react.
5.4 Activation and deactivation of the controller
The controller is activated and deactivated from the main display without any menus. Press key to switch
from Manual Mode (controller OFF) to Automatic Mode (controller ON) and vice versa. The actual mode is
indicated in the display.
WARNING
Make sure that the controller is deactivated before connecting dosing pumps or other actuators!
Main menu
.
. Basic settings
Basic settings .
. Turn-on delay
Turn-on delay Turn-on delay
ON
Turn-on delay
180 s
5.5 Turn-on delay
Set a delay time which has to pass before the controller is activated after start-up or power interrupt. This
allows the measurement to settle and prevents inappropriate dosage of chemicals.
5.6 External controller stop
You can activate or deactivate the controller with an external switch by using the digital input. This feature
requires no settings or adjustments. If the digital input is short- circuited, the controller stops, and the
message „external controller stop“ appears in the display.
NOTE This feature can also be used as lack-of water indication. Just connect a level sensor to the digital input.