3-20
3.3.3. Wiring and EMC guidelines
For effective interference suppression, do not route power and control cables in the same
conduit or trunking
To prevent radiated noise, motor cable should be put in a metal Conduit. Alternatively an
armored or shielded type motor cable should be used
Motor cable and signal lines of other control equipment should be at the least 30 cm
apart
For effective suppression of noise emissions the cable armor or shield must be grounded
at both ends to the motor and the inverter ground. These connections should be as short
as possible
L1(L)
L3
N
1. Protective Earth Conductor. Conductor size for
enclosure & Back plate must comply with the
local electrical standards. Min 10mm²
2. Back plate. Galvanised steel (Unpainted)
3. Ferrite core / Output reactor ferrite cores can
be used to reduce radiated noise due to long
motor cables. If ferrite core is used loop motor
wires, 3 times round the core. Install core as
close to the inverter as possible. Output
reactors provide additional benefit of reducing
dv/dt for protection of motor windings.)
4. Metal Cable clamp. no more than 150mm from
the inverter.
Note：
If no enclosure & back plate is used then connect
the cable shield by a good 360 degree termination
to the Inverter output terminal E.
5. Screened (Shielded four core cable)
6. Separate Protective Earth wire, routed outside
motor cable separated be at least 100mm.
Note：
This is the preferred method specially for large
output cables and long length.
Multi-core screened (3 core & protective earth)
can be used for small power and short length
7. Connect the cable shield by a good 360º
termination and connect to the motor
protective earth terminal. This link must be as
short as possible.
8. Motor Earth terminal(Protective Earth)
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