18
Figures 42 and 43 show installations with and without filter and
where to use screened and unscreened cable.
Fig. 42
Example of installation without filter
Fig. 43
Example of installation with filter. The cable between
the CUE and filter must be short.
Fig. 44
Submersible pump without connection box. Variable
frequency drive and filter installed close to the well.
Fig. 45
Submersible pump with connection box and screened
cable. Variable frequency drive and filter installed
close to the well.
14. Operating modes
The following operating modes are set on the control panel in
menu OPERATION, display 1.2. See section
10.5.2
.
Example:
Max. curve operation can for instance be used in
connection with venting the pump during installation.
Example:
Min. curve operation can for instance be used in
periods with a very small flow requirement.
15. Control modes
The control mode is set on the control panel in menu
INSTALLATION, display 3.1. See section
1
7
.7.1
.
There are two basic control modes:
•
Uncontrolled operation (open loop)
•
Controlled operation (closed loop) with a sensor connected.
See sections
15
.1
and
15
.2
.
15.1 Uncontrolled operation (open
loop)
Example:
Operation on constant curve can for instance be used
for pumps with no sensor connected.
Example:
Typically used in connection with an overall control
system such as the MPC or another external controller.
T
M
0
3 880
2 250
7
T
M
0
3 880
3 2507
T
M
04
3579 4608
T
M
04
3580
460
8
Operating mode Description
Normal
The pump is running in the control mode
selected.
Stop
The pump has been stopped (green indicator
light is flashing).
Min.
The pump is running at minimum speed.
Max.
The pump is running at maximum speed.
T
M
03 88
13 25
07
Min. and max. curves.
The pump speed is kept at a given
set value for minimum and maximum
speed, respectively.
Unscreened cable
Screened motor cable
M
CUE
Unscreened cable
Screened motor
cable
M
CUE
Filter
M
CUE and filter close to well
CUE
Screened
cable
Unscreened
drop cable
Unscreened
cable
Filter
CUE
Screened
cable
* Both ends of the screened cable between filter and
connection box must be connected to ground.
Connection
box*
M
Screened
cable
Unscreened
drop cable
Unscreened
cable
Filter
Min.
Max.
T
M
03 8
479 1
60
7
Constant curve.
The speed is kept at a set value in
the range between the min. and max.
curve.
The setpoint is set in %
corresponding to the required speed.
Grundfos.bk Page 18 Friday, July 30, 2010 10:10 PM
Grundf
os CU
E
35
