3 Installation
3.4 Correct EMC installation
DB1 variable frequency drive
11/20 MN040031EN
Eaton.com
59
3.4.1 EMC measures in the control panel
In order to have an installation that meets EMC requirements, make sure to
connect all the metallic parts in the devices and in the control panel to each
other across a large area and in a way that will make it possible to conduct
high frequencies. Mounting plates and control panel doors should be connec-
ted to the panel by means of short drain wires with an electrical contact esta-
blished across a large surface area.
Figure 31: Cable routing
￫
Do not make connections to painted surfaces (electrolytic oxida-
tion, yellow chromated).
￫
Route mains and motor cables in the control panel as close to
the ground potential as possible. This is because free moving
cables act as antennas.
￫
If routed in parallel, cables carrying high frequencies (e.g. shiel-
ded motor cables) and clean cables (e.g. mains supply cables,
control and signal cables) should be installed at a distance of at
least 100 mm from one another in order to avoid electromagne-
tic interference. You should also use separate cable entries if
there is a major difference in voltage. If control cables and
power cables need to cross, they should always do so at a right
angle (90°).
￫
Never lay control or signal cables
②
in the same duct as power
cables
①
.
Analog signal cables (measured values, set points, and correc-
tion values) must be routed inside shielded conduits.
≧
100 mm
(≧ 3.94“)
②
①
