Settings; Setting The Dip Switches; Speed Settings - Grundfos Variable Speed Installation And Operating Instructions Manual

7. Settings

7.1 Setting the dip switches

Fig. 4 Dip switches
7.1.1 Dip switch settings
Switch ON
A mA
2-10 V
B
4-20 mA
Min. speed Min. speed
C
off
Speed
D control
external

7.2 Speed settings

7.2.1 Dip switch C
Minimum speed off / minimum speed 15 %
When dip switch C is in the ON position the
variable speed of the pump will have a range
from minimum speed = off to maximum speed
= 100 %. When dip switch C is in position OFF
the variable speed of the pump will have a range
from minimum speed = 15 % to a maximum
speed = 100 %.
Position
OFF Default
(V) DC mA
0-10 V 2-10 V
0-20 mA 4-20 mA
Min. speed
15 % off
Speed
Speed
control
control
manual %
external
dial
7.2.2 Dip switch D
Speed control external / speed control
maximum % dial
When dip switch D is in position ON, an
external V(DC)/mA signal will cause the pump
speed to vary and the dial on the terminal box
will function in the -5 % to +5 % mode. When dip
switch D is in position OFF, turning the manual
% dial will vary the pump speed. The pump will
not respond to an external V(DC)/mA signal
even if one is present. The terminal box and the
dial will function in the minimum to 100 % mode.
7.2.3 Multi function dial on terminal box
Offset dial (when dip switch D is on)
The Offset dial allows the user to fine-tune the
input signal. The input signal may be varied plus
or minus 1-5 %. This offset will affect the signal
through its entire range. The factory default is 0.
The offset setting cannot increase the output to
more than 100 % or less than the selected
minimum output of either 0 % or 15 %.
Example:
The measured input signal is 2.1 - 10.1 V and as
a result the pump does not shut off because the
signal does not drop to 2 V. The dial is set to
-5 % and the input signal is offset down to
2.0 - 9.6 V. The pump will now shut off; however
the pump will not reach the full 10 V speed now,
due to the offset.
Fig. 5 Offset in percent
9