Burkert 8619 Operating Instructions Manual page 111

Type 8619
Parameters menu
Conductivity
Standard setpoint
Prebleed setpoint
"PBLIMITx"
CMD1
100%
0%
Title "Tdos
state" (see
Fig. 70)
"OFF": pending dosing
"BLEED": prebleed in progress
"ON": dosing in progress
"WAIT": waiting time; see page 123
Fig. 69: Combination of "ONOFF" and "TIME DOSING" functions on a conductivity measurement
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 section 9.19).
When prebleed is activated, enter the prebleed setpoint value:
- LIM CA1:Enter the prebleed setpoint for channel 1 on the associated "Time Dosing" function.
- LIM CA2:Enter the prebleed setpoint for channel 2 on the associated "Time Dosing" function.
The prebleed lowers the fluid conductivity to a value less than the standard setpoint value of the ON/OFF
regulator. The prebleed setpoint "LIM CAx", when enabled, takes priority over the standard setpoint of the
regulator
CMD SAFE: Confirm (select "Mode: ON") or do not confirm (select "Mode:OFF") the use of a fallback
position on the output when the "System switch" event (see section 9.8) has the state "ON". When use of
the fallback position is confirmed, enter a fallback position value of 0...100 % for each output.
29/06/2010
F2:ONOFF 13:40
µS/cm
250.0
1
PV
µS/cm
1 500.0
SP-PV:
0 %
0.00
CMD1
0
Off
F3 Dos.St
MENU SP
MANUAL
Press this dynamic key to
enter the setpoint value.
Fig. 70: Example of a view, in Process level, of the ONOFF function associated with a time dosing function
"OFF" "BLEED" "ON"
Time dosing cycle, priority on
Measured value of the process variable chosen
Value of the standard setpoint
Result of the ONOFF function
Associated Time dosing; dosing status is "Off".
See Fig. 69: Combination of "ONOFF" and "TIME DOSING" functions on a
conductivity measurement for the various states of a dosing operation
Change of status if "PBLIMIT" is
reached or "MAXONTIME" exceeded
"WAIT"
the controller
English
t
111