Control characteristic for direct and inverse control action
Field R236 offers two control characteristics for selection which have the effects shown in the
following diagram.
5.5.3
Timer for cleaning function
This function can be used to implement a
simple cleaning routine. The user can specify
a time interval after which cleaning is to start;
i.e. only constant intervals can be defined.
There are other cleaning functions in
conjunction with the Chemoclean function
(version with four contacts, see chap. 5.5.4).
Note:
The timer and Chemoclean do not
work independently of each other.
Whilst one of the functions is active,
the other cannot be started.
X
X
– X
– X
w
w
w
w
100 %
100 %
Y
Y
REGEL03.CDR
direct =max
function
inverse =min
function
Fig. 5.9
Control characteristic of a
proportional-action
controller with direct and
inverse control action
Wiper and / or spray cleaning
system
active
inactive
Hold function
active
inactive
Cleaning time
(0 ... 999 s)
Pause time between
2 cleaning intervals
(1 ... 7200 min)
Clean-Hold
delay time
(0 ... 999 s)
Time
DIAGR-TI.CDR
Fig. 5.10
Relationship between
cleaning time, pause time
and hold delay time
Instrument configuration
Liquisys M CUM 223 / 253
34
Hauser
