CABLING AND CONNECTIONS vacon • 43
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6
6.2.2.2 Installation of ferrite rings (+OCM) on the motor cable
Slip only the phase conductors through the rings; leave the cable screen below and outside the
rings, see Figure 24. Separate the PE conductor. In case of parallel motor cables, reserve an equal
amount of ferrite ring sets for each cable and feed all the phase conductors of one cable through
one set of rings.
Vacon's delivery consists of fixed sets of ferrite rings (option). When ferrite rings are used to
attenuate the risk of bearing damages, use always 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.
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