AUX E&H Series Betriebsanleitung PDF herunterladen (Seite 44)

5.6.4 ChemoClean function

Just like the timer function, ChemoClean can

also be used to start a cleaning cycle.

However, ChemoClean supports different

cleaning and rinse intervals.

Thus, irregular cleaning with different repeat

cycles is possible, and cleaning times with

post-rinse times can be individually defined.

Note:

• Use relays 3 (water) and

4 (cleaner) for the ChemoClean

function.

• Abortion of the cleaning process is

always followed by a post-rinse

time.

• When “Economy” is selected,

cleaning is performed with water

only.

5.5.5 Neutralisation controller

Note:

Use relays 1 and 2 for the

neutralisation control.

Neutralisation control means that the pH value

of a medium is held constant by adding acid

or alkali as required. This task requires two

separate actuating signals – one for acid and

one for alkali.

The neutralisation controller is a controller

with two relay contacts specifically tailored to

this application. A P(ID) controller is available

to handle this task.

The controller gain K

p

for acid and alkali can

be separately adjusted. Integral action time T

n

and derivative action time T

v

apply to both

controllers (compared to chap. 5.5.2, p. 39).

The “neutral zone” is located between the set-

point 1 and setpoint 2. In the case of a control-

ler without an integral component (P, PD),

there is no alkali or acid dosing ink the “neu-

tral zone” (Y = 0, see Fig. 5.16). In the case of

a controller with an integral component (PI,

PID), there is constant alkali/acid dosing (Y

new

=Y

old

). The behaviour of the I component

within the “neutral zone” depends on the

process type (Inline / Batch).

The “neutral zone” can be shifted in the X

direction as desired via the set points 1 and 2.

Hold

Water

Cleaner

CHEMO.CDR

t

0

t

1

t

2

t

3

t

4

t

5

t

1

cleaning start

t

2

– t

1

pre-rinse time

t

3

– t

2

cleaning time

t

4

– t

3

post-rinse time

t

5

– t

4

hold dwell period

Fig. 5.15 Cleaning cycle sequence

NEUTRA.CDR

Y [%]

Regulating contact 1

for alkali

Regulating contact 2

for acid

neutral

zone

X

100

50

0

Set point

Setpoint 1

Setpoint 2

Fig. 5.16

Characteristic of a

proportionalneutralisation

controller

Instrument configuration Liquisys M CPM 223 / 253

42 Endress+Hauser

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 91 92

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