Grundfos DDI 209, Инструкция по установке и эксплуатации

Страница: 55 / 76

English (GB)
55
Result of weighting
In the example, the following values were entered as
reference points L
d
and H
d
:
L
d
: mA
min.
= 6 mA, Q
select mA min.
= 2 l/h
H
d
: mA
max.
= 16 mA, Q
select mA max.
= 8 l/h.
The curve for current input/current output now
passes through Q = 0 at < 6 mA, from Q = 2 l/h at
6 mA to Q = 8 l/h at 16 mA, and through Q = 8 l/h at
> 16 mA (curve 1d).
In the same way, it is possible to enter a current
weighting with a negative gradient. In order to do
this, the value pair for reference point L must first be
entered with the smaller mA value followed by
reference point H.
In the example, the following values were entered as
reference points L
e
and H
e
:
L
e
: mA
min.
= 2 mA, Q
select mA min.
= 12 l/h
H
e
: mA
max.
= 16 mA, Q
select mA max.
= 2 l/h.
The curve for current input/current output now
passes through Q = 0 at < 2 mA, from Q = 12 l/h at
2 mA to Q = 2 l/h at 16 mA, and through Q = 2 l/h at
> 16 mA (curve 1e).
Fig. 54 Result of weighting
TM
03
66
13
45
06
0 mA 4 mA 8 mA 12 mA 16 mA 20 mA
0
I
in
[mA]
Q [l/h]
1d
10 l/h
4 l/h
Q
select mA max. d
8 l/h
2 l/h
6 l/h
1e
Q
select mA max. e
Q
select mA min. d
Q
select mA min. e
Q
select mA max. d
Q
select mA max. e
Q
select mA min. e
Q
select mA min. d
I
in
[mA]
Note
The maximum flow rate of the pump
must not be exceeded!