3 Installation
3.6 Electrical Installation
70
DC1-S…20…, DC1-S…OE1 Variable Frequency Drives
05/21 MN040058EN
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 41: 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).
Figure 42: 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).
15 mm
(0.59’’)
PES
a
b
PES
Summary of Contents for PowerXL
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