Vega VEGAMET 391, Руководство по эксплуатации, Страница: 47 / 68

N ote :
A
fter switching on or a failure
,
always two complete cycles must be
executed until a measured value di
ff
erence can be calculated and a
tendency can be outputted
.
T
he level in a basin should be monitored on rising tendency
. I
f the rise
is higher than
25
%
per minute
,
an additional emptying pumpt should
be switched on
. T
he max
.
reaction time should be one minute
. I
n case
of a probable failure
,
the pump should be switched o
ff .
S
elect in the
DTM
navigation section the menu items
" M eas . loop -
O utputs - R elay " .
l
E .
g
.
set for relay 1 the mode
"
R ising tendency
"
l
S
elect under
"
R eaction in case of failure
"
the option
"
S witching
condition o ff
"
l
E
nter the following values into the parameter
fi
elds
:
-
M
easured value more than
25
% /
min
.
-
M
ax
.
reaction time
1
min
.
T
he function of the tendency recognition is shown in detail in the
following diagram
. T
he previously described example is used as a
basis
.
t
t
m
t
m
t
m
t
m
120
180 240
ON
OFF
60
[sec]
1 2 3 4
5
...
... ... ...
100
75
50
25
0
%
...
F ig .
14
: E xample for tendency recognition
1 O ld average value = 25 % , new average value = 25 %
D i ff erence
< 25 %
-
>
R elay ON
2
O ld average value
= 25 %
, new average value
= 37
.
5 %
D i ff erence < 25 % - > R elay ON
3
O
ld average value = 37
.
5 %
,
new average value = 62
.
5 %
D i ff erence = 25 % - > R elay OFF
4 O ld average value = 62 . 5 % , new average value = 75 %
D i ff erence < 25 % - > R elay ON
5
tm -
>
max . reaction time
E xample
S etup
VEGAMET
391
•
4
…
20
m
A / HART
signal conditioning instrument
47
8
A
pplication examples
36032
-
EN
-
091116