Grundfos DDI 209, Инструкция по установке и эксплуатации

Страница: 53 / 76

English (GB)
53
Fig. 52 Current input and current output with subsequent weighting
9.9.2 With calibrated pump
When calibrating the pump for your application and
using current signal control and/or current output,
proceed as follows:
1. Calibrate the pump.
2. Determine the maximum flow rate Q
cal
by taking
a reading on the pump: Q
cal
is the maximum
adjustable flow rate after calibration, e.g. in
manual mode, or the displayed flow rate in
continuous operation (press and hold down the
"Start/Stop" button for longer than 1 second).
3. To set the current input/current output weighting,
see section 9.9.3 Setting the weighting .
9.9.3 Setting the weighting
TM
03
66
08
45
06
0 mA 4 mA 8 mA 12 mA 16 mA 20 mA
0
I
in
[mA]
3a
3b
Q
select mA max. b
/
mA
max.
Q
select mA max. a
/
mA
max.
Q
select mA min.
/
mA
min.
Q [l/h]
10 l/h
4 l/h
8 l/h
2 l/h
6 l/h
Q
select mA max. a
/ mA
max.
Q
select mA max. b
/ mA
max.
Q
select mA min. a
/
mA
min.
I
in
[mA]
Note
For unweighted assignment (curves
1a and 2a, see fig. 50) select the
following reference points:
L: mA
min.
= 0 (4) mA / Q
select mA min.
=
0 l/h
H: mA
max.
= 20 mA / Q
select mA max.
=
Q
cal
.
Note
Q
cal
is not updated automatically when
the pump is re-calibrated. This protects
the user-defined value pairs.
After calibration, new weighting may be
required!
Note
The setting options for weighting
depend on the selected current signal
control. The parameters for 0-20 mA
and for 4-20 mA are independent of one
another. The weighting parameters are
modified and saved according to the
set operating mode.
Select the current control operating
mode used later (0-20 mA / 4-20 mA)
manually or via contact signal before
weighting. (Weighting of the control
output for manual control mode or
contact signal control is the same as
current weighting 4-20 mA.)