Operating Instructions ACU
7.4.3.1 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.
Frequency inverters ≤ 9.2 kW with integrated EMC filter comply with the emission
limits stipulated in EN 61800-3 if the motor cable is no longer than 10 m. Frequency
inverters ≤ 9,2 kW of Design 3 with integrated EMC filter comply with EN 61800-3 if
the motor cable is no longer than 20m. Customer-specific requirements can be met
using an optional filter.
7.4.3.2 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 recommended values for the use
of output filters.
Motor cable length with output filter
7.4.3.3 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 filtered 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. This must be considered in the projecting phase already.
If the motor cable length exceeds 300 m, please consult BONFIGLIOLI.
7.4.3.4 Group drive
In the case of a group drive (several motors at one frequency inverter), the total length shall be
divided across the individual motors according to the value given in the table. Please note that group
drive with synchronous servomotors is not possible.
Use a thermal monitoring element on each motor (e.g. PTC resistor) in order to avoid damage.
7.4.3.5 Speed sensor connection
Install sensor cables physically separate from motor cables. Comply the sensor manufacturer's
specifications.
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