Motor Cable; Mains And Motor Connection - Grundfos CUE Series Installation And Operating Instructions Manual

6.4 Motor cable

To meet EN 61800-3, the motor cable must always
be a screened cable, whether an output filter is
installed or not.
The mains cable need not be a screened cable. See
figs 12, 13, 14 and 15.
1
Fig. 12 Example of installation without filter
1
Fig. 13 Example of installation with filter. The cable between
CUE and filter must be short
1
Fig. 14 Submersible pump without connection box. Frequency
converter and filter installed close to the well
1 2
Fig. 15 Submersible pump with connection box and screened
cable. Frequency converter and filter installed far away
from the well and connection box installed close to the
well
Symbol Designation
1 CUE
2 Filter
3 Connection box
4 Standard motor
5 Submersible motor
One line Unscreened cable
Double line Screened cable
4
2 4
2 5
3
5

6.5 Mains and motor connection

Check that the mains voltage and frequency
correspond to the values on the nameplate of CUE
and the motor.
The motor cable must be screened for CUE to meet
EMC requirements.
The supply voltage and frequency are marked on the CUE
nameplate. Make sure that CUE is suitable for the power supply
of the installation site.
6.5.1 Main switch
A main switch can be installed before the CUE cabinet according
to local regulations. See fig. 7.
6.5.2 Wiring diagram
The wires in the terminal box must be as short as possible.
Excepted from this is the protective conductor which must be so
long that it is the last one to be disconnected in case the cable is
inadvertently pulled out of the cable entry.
Fig. 16 Wiring diagram, three-phase mains connection
Terminal Function
91 (L1)
92 (L2) Three-phase mains supply
93 (L3)
95/99 (PE) Protective earth connection
96 (U)
Three-phase motor connection, 0-100 % of
97 (V)
mains voltage
98 (W)
For single-phase connection, use L1 and L2.
9