English
INSTALLATION AND CONNECTION
PE
SCu
W
U
V
(a)
Symmetrical shielded cables: three concentric conductors with or without a
ground conductor, symmetrically manufactured, with an external shield of copper
or aluminum
SCu
PE
PE
PE
U
V
W
AFe
PEs
oo
oo
o
o
o
o
o
o
o
o
o
o
o
o
o
oo
ooooooo
o
o
o
o
o
o
o
o
o
o
o
o
o
oo
oo
o
V
U
W
(b)
Alternative for conductors up to 10 mm²
SCu
= copper or aluminum external shielding.
AFe
= steel or galvanized iron.
PE
= ground conductor.
Note 1:
Cable shielding shall be grounded at both ends (inverter and motor). Use 360º connections for a low impedance to high-frequencies.
Refer to
.
Note 2:
For using the shield as a protective ground, it shall have at least 50% of the power cables conductivity. Otherwise, add an external
ground conductor and use the shield as an EMC protection.
Note 3:
Shielding conductivity at high-frequencies shall be at least 10% of the power cables conductivity.
Figure 3.15:
Motor connection cables recommended by IEC 60034-25
3.2.4.3.2 Connection of the Motor Cable Shield to Ground
Inverters of the CFW900 series include clamps and grounding plates that simplify the connection of the control
cables and motor cable shield, enabling a low impedance connection for high frequencies.
shows an
example of motor cable connection using these materials in an inverter with IP2X protection rating. The connection
on inverters with UL type 1 protection rating is similar.
Figure 3.16:
Detail of the motor cable shield connection
36 | CFW900
Summary of Contents for CFW900
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