Eaton PowerXL DB1 Installation Manual page 58

3 Installation
3.5 Electrical Installation
3.5.1.2 Connecting the motor cable
54
The screened cables between the variable frequency drive and the motor
should be as short as possible.

Figure 21: Connection on motor side
▶ Connect the shielding, on both sides and across a large area
(360° overlap), to the protective earth (PE) .
The cable protective earth shield (PES) connection should be in the
immediate proximity of the variable frequency drive and directly on the
motor terminal box.
▶ Prevent the screen earth kit from becoming unbraided, i.e. by pushing
the separated plastic covering over the end of the shielding or with a rub-
ber grommet on the end of the shielding. Connect the shielding braid
onto the end across a large area (PES).
Alternatively, you can twist the shielding braid and connect it to the pro-
tective earth using a cable lug. In order to prevent EMC interference, this
twisted shielding connection should be as short as possible (recom-
mended value for the twisted cable shielding: b ≧ 1/5 a).
15 mm
(0.59'')
PES
Figure 22: Screened connection cable in motor circuit
Screened, four-wire cable is recommended for the motor cables. The green-
yellow conductor in these cables must be used to connect the motor's and
variable frequency drive's PE terminals, minimizing the loads on the cable
screen (high equalizing currents).
DB1 Variable Frequency Drives 09/17 MN040031EN www.eaton.com
PES
a
b