6.4.3.1 Length of motor cables, without filter
Permissible length of motor cable without output filter
The specified lengths of the motor cables must not be exceeded if no output filter is
installed.
The frequency inverters ≤ 9.2 kW with integrated EMC filter comply with the emission
limits of the product standard EN 61800
-
3 up to a motor cable length of 10 m. The
frequency inverters ≤ 9.2 kW with integrated EMC filter comply with the emission limits
stipu
lated in EN 61800-3 if the motor cable is not longer than 20 m. Customer-
specific
requirements can be met by means of an optional filter.
6.4.3.2 Motor cable length, with output filter dU/dt
Longer motor cables can be used after taking appropriate technical measures, e.g.
use of low-capacitance cables and output filters. The following table contains recom-
mended values for the use of output filters.
Motor cable length with output filter
6.4.3.3 Motor cable length, with sinus filter
Motor cables can be much longer if sinus filters are used. By conversion in sinus-
shaped currents, high-frequency portions which might limit the cable length are fil-
tered out. Also consider the voltage drop across the cable length and the resulting
voltage drop at the sinus filter. The voltage drop results in an increase of the output
current. Check that the frequency inverter can deliver the higher output current. Th
must be considered in the projecting phase already.
If the motor cable length exceeds 300 m, please consult BONFIGLIOLI.
06/13 Operating Instructions ACU 57
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