Installation
M-Max Series Adjustable Frequency Drive MN04020003E—October 2013 www.eaton.com 35
Prevent the shielding from becoming unbraided, for example,
by pushing the separated plastic covering over the end of the
shielding or with a rubber grommet on the end of the
shielding. As an alternative, in addition to a broad area cable
clip, you can also twist the shielding braid at the end and
connect to protective ground with a cable clip. To prevent
EMC disturbance, this twisted shielding connection should
be made as short as possible (see figure below).
Screened Connection Cable
Shielded, 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
frequency inverter and therefore minimizes the equalizing
current loads on the shielding braid.
Connection with Twisted Cable Shielding
(Recommended value for twisted cable shielding: b 1/5 a)
Twisted shielding braid should be connected with a ring
cable terminal (see figure on Page 33) on PES.
The following figure shows the construction of a four-wire,
shielded motor line (recommended specifications).
Four-Core Shielded Motor Supply Cable
If there are additional subassemblies in a motor circuit (for
example, motor contactors, relays, motor reactor, sinusoidal
filters, or terminals), interrupt the shielding of the motor
cable in the vicinity of these subassemblies. Connect this
over a broad surface area with the mounting plate (PES).
Free or non-shielded connection cables should not be any
longer than about 11.81 in (300 mm).
0.59 in
(15 mm)
PES
U/T1
V/T2
W/T3
a
b
PES
Item
Number Description
1 Cu shield braid
2 PVC outer sheath
3 Drain wire (copper strands)
4 PVC core insulation, 3 x black, 1 x green–yellow
5 Textile and PVC fillers
1
2
3
45
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