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The supply voltage and frequency are marked on the
pump nameplate. The voltage tolerance must be
within - 10 %/+ 6 % of the rated voltage. Make sure
that the motor is suitable for the power supply
available at the installation site.
All pumps are supplied with 10 m cable and a free
cable end.
Warning
Before installation and the first startup of
the pump, check the cable visually to avoid
short circuits.
A possible replacement of the cable must
Caution
be carried out by Grundfos or a service
workshop authorised by Grundfos.
The pump must be connected to one of these two
controller types:
•
a control box with motor-protective circuit
breaker, such as Grundfos CU 100 control box
•
a Grundfos LC, LCD 107, LC, LCD 108 or LC,
LCD 110 pump controller.
See fig.
6
or
7
and the installation and operating
instructions for the selected control box or pump
controller.
In potentially explosive environments you have two
options:
•
Use float switches made for Ex environment and
a safety barrier in combination with either DC,
DCD or LC, LCD 108.
•
Use air bells in combination with LC, LCD 107.
For more information about the function of the
thermal switches, see section
8.1 Wiring diagrams
L
N
PE
PE
1
2
3
1
Fig. 6
Wiring diagram for single-phase pumps
8.4 Thermal
switches.
4
5
6
T2
T1
T3
˚
˚
160
C
150
C
L1
L2 L3
PE
PE
1
2
3
3
Fig. 7
Wiring diagram for three-phase pumps
8.2 CU 100 control box
The CU 100 control box incorporates a motor-
protective circuit breaker and is available with level
switch and cable.
Single-phase pumps
Connect a run capacitor to the control box.
For capacitor size, see the table:
Pump type
DP and EF
Start and stop levels
The difference in level between start and stop can be
adjusted by changing the free cable length.
Long free cable = large difference in level.
Short free cable = small difference in level.
Note
Observe the two following points.
•
To prevent air intake and vibrations, install the
stop level switch in such a way that the pump is
stopped before the liquid level is lowered below
the upper edge of the clamp on the pump.
•
Install the start level switch in such a way that the
pump is started at the required level. However,
the pump must always be started before the
liquid level reaches the bottom inlet pipe to the
pit.
Warning
The CU 100 control box must not be used
for Ex applications.
See section
8.3 Pump
4
5
6
T2
T1
T3
170
˚
C
150
˚
C
Run capacitor
[μF]
[V]
30
450
controllers.
15
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