Vega VEGAMET 391, Руководство по эксплуатации, Страница: 43 / 68

P
robable failures of the pumps can be processed in addition via the
digital inputs
.
W
ith this pump control
,
there are two di
ff
erent versions
:
l
P
ump control 1
: T
he upper switching point determines the switch
-
o
ff
point for the relay
,
whereas the lower switching point
determines the switch
-
on point
l
P
ump control
2
: T
he upper switching point determines the switch
-
on point for the relay
,
whereas the lower switching point
determines the switch
-
o
ff
point
T
wo pumps should empty the vessel when a certain level is reached
.
A
t
80
% fi
lling
,
the pump with the shortest running time should switch
on
. I
f the level nevertheless increases
,
a second pump should switch
on at
90
% . B
oth pumps should switch o
ff
again at
10
% fi
lling
.
S
elect in the
DTM
navigation section the menu items
"
M eas . loop -
O
utputs
- R
elay "
.
l
S
et mode
" P ump control 2 "
for relay
1
and
2
.
l
E
nter the switching points for the concerned relays as follows
:
-
R
elay
1
upper switching point
=
80
.
0
%
-
R
elay
1
lower switching point
=
10
.
0
%
-
R
elay
2
upper switching point
=
90
.
0
%
-
R
elay 2 lower switching point
=
10
.
0
%
T
he function of pump control
2
is shown in detail in the following
diagram
. T
he previously described example is used as a basis
.
Rel. 1: 80% On
On
Off
Off
On
Rel. 2: 90% On
Rel. 1, 2: 10% Off
10 30 20 20 15
t [h]
5
Rel. 1
Rel. 2
F ig . 12 : E xample of a pump control 2
W
ith a pump control
,
there is also the option of switching on pump
monitoring
. F
or this
,
a return signal on the respective digital input is
required
. T
he assignment of the digital inputs to the relais is preset
:
l
D
igital input
1
- R
elay
1
l
D
igital input
2
- R
elay
2
l
D
igital input
3
- R
elay
3
E xample
S etup
VEGAMET
391
•
4
…
20
m
A / HART
signal conditioning instrument
43
8
A
pplication examples
36032
-
EN
-
091116