3 Installation
3.6 Electrical Installation
108
DA1 Variable Frequency Drives
08/18 MN04020005Z-EN
www.eaton.com
Screened, four-wire cable is recommended for the motor cables. The green-
yellow line of this cable connects the protective ground connections from the
motor and the variable frequency drive and therefore minimizes the
equalizing current loads on the screen braid.
The following figure shows the construction of a four-wire, screened motor
line (recommended specifications).
Figure 73: Four-core, screened motor supply cable
a
Cu screen braid
b
PVC outer casing
c
Flexible wire (copper strands)
d
PVC core insulation, 3 x black, 1 x green–yellow
e
Textile braid and PVC fillers
If there are additional subassemblies in a motor feeder (such as motor
contactors, overload relays, motor chokes, sine wave filters or terminals), the
shielding of the motor cable can be interrupted close to these subassemblies
and connected to the mounting plate (PES) with a large area connection.
Free or non-shielded connection cables should not be any longer than about
300 mm.
b
a
e
d
c
