6
vacon • 92 Electrical cabling and connections
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
6.1.8 Installation of ferrite rings (option) on the motor cable
Slip only the phase conductors
through the window; leave the cable
screen below and outside the rings,
see Figure 40. Separate the PE
conductor. In case of parallel motor
cables, reserve an equal amount of
ferrite rings for each cable and feed
all the phase conductors of one cable
through one set of rings. The delivery
includes fixed sets of ferrite rings.
When ferrite rings are used to
attenuate the risk of bearing
damages, the number of ferrites has
to be 6…10 for a single motor cable
and 10 per cable when the motor is
supplied with parallel cables.
NOTE! The ferrite rings are only
additional protection. The basic
protection against bearing currents is
an insulated bearing.
Figure 40.
Installation of ferrite rings
6.1.9 Cable installation and the UL standards
To meet the UL (Underwriters Laboratories) regulations, a UL-approved copper cable with a
minimum heat-resistance of 90
°C must be used.
Use Class 1 wire only.
The units are suitable for use on a circuit capable of delivering not more than 100,000 rms
symmetrical amperes, 600 V maximum.
The tightening torques of the terminals are given in Table 40.
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