3 Installation
3.6 Electrical Installation
82
DC1 Variable Frequency Drive
04/16 MN04020003Z-EN
www.eaton.com
3.6.1.4 Connecting the motor cable
The screened cables between the variable frequency drive and the motor
should be as short as possible.
Figure 44: Connection on motor side
▶
Connect the screening, on both sides and across a large area (360°
overlap), to the protective earth (PE)
.The power screening’s
protective earth (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
rubber grommet on the end of the shielding. Terminate the cable screen
across a large area at the end (PES).
Alternatively, you can twist the screen braid and connect it to the
protective earth with a cable lug. In order to prevent EMC interference,
this twisted screen connection should be as short as possible
(recommended value for the twisted cable screen: b
1/5 a).
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).
Figure 45: Screened connection cable in motor circuit
15 mm
(0.59’’)
PES
a
b
PES
