vacon • 42
Installation
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4.6.3
EMC grounding
For the EMC levels C1 and C2, it is necessary to have a 360º grounding of the shield on both ends of
the motor cable. The EMC grounding clamps must be suited to the output cable diameter to give a
360º contact with the cables. To make a 360° connection with the grounding clamp, expose the
shield of the motor cables.
Figure 26. 360º grounding
4.6.4
Installation of ferrite rings (+OCM) on the motor cable
Route only the motor phase conductors through the ferrite rings. Do not route the PE/ground wire
through the ferrite rings. Leave the cable screen below and outside the rings. Mount the PE/ground
wire or pigtail on the ground busbar.
In case of parallel motor cables, reserve an equal amount of ferrite ring sets for each cable. Route
all the phase conductors of one cable through one set of rings.
The delivery consists of fixed sets of ferrite rings (option). When ferrite rings are used to attenuate
the risk of bearing damage, always use two ferrite ring sets per motor cable.
NOTE!
The ferrite rings are only additional protection. The basic protection against bearing currents
is an insulated bearing.
Figure 27. Installation of ferrite rings on motor cables
1
5
5
9
8
_
0
0
PE
+OCM
1
5
6
0
1
_
0
0
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Summary of Contents for NXP series
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