Burkert Type 8619 - Manual (Page 54)

52
Adjustmentandcommissioning
0%
100%
Fx: CMD1
PV parameter
Setpoint
non-inverted mode
hysteresis
0%
100%
Fx: CMD1
PV parameter
Setpoint
inverted mode
hysteresis
Figure 40 : Hysteresis operating, non-inverted and inverted
MAXONTIME: Enter the max. authorised duration of output control: after this period, the output is deactivated.
PREBLEED: Define (choose "ON") or not (choose "OFF") the ONOFF function for controlling a conductivity
function as a prebleed function associated with a time dosing function ("Time Dosing": see chap. 8.10.15). When
prebleed is activated, enter the prebleed setpoint value:
- PBLIMIT1: enter the prebleed setpoint for channel 1 on the associated "Time Dosing" function.
- PBLIMIT2: enter the prebleed setpoint for channel 2 on the associated "Time Dosing" function.
Prebleed lowers the conductivity of the fluid to a value below the standard setpoint value of the ON/OFF con-
troller. When activated, the prebleed setpoint, "PBLIMITx", overrides the standard setpoint of the controller.
A prebleed setpoint value lower than or equal to the conductivity setpoint value of the ON/OFF controller
must be entered.
0
1
conductivity
standard setpoint
t
CMD1
time dosing cycle, priority on the
controller
prebleed setpoint
"PBLIMITx"
"OFF" Title "Tdos state"
(see Figure 42)
"OFF" : pending dosing
"BLEED" : prebleed currently underway
"ON" : dosing currently underway
"WAIT" : waiting time; see page 64
"BLEED" "ON" "WAIT"
change of status if "PBLIMIT" is reached or
"MAXONTIME" exceeded
Figure 41 : Combination of "ONOFF" and "TIME DOSING" functions on a conductivity measurement
Type 8619
english