Operating & Mounting instructions – 8 074 143.03/03 – Page 78
2.) Control, mains supply and motor discharge should be separated, if possible
3.) Never install control lines, mains wires or motor cable in a common cable conduit!!
If control lines have
to cross power
cables, they should
do so at right
angles.
4.) Use only screened control lines (exception: relay contacts and digital inputs, if installed
completely separate from the power cables). The screen must always be grounded bilaterally
(exception: in case of earth circuit problems due to transient currents that heat the screen, only
the signal input side is grounded or a parallel compensating wire is installed).
Control lines
should be
separated from
motor cables by
a distance of at
least 30 cm.
5.) The primary function of the motor cable screen is to improve the connection between motor and
inverter, so that as little interfering current as possible flows past the filter to the mains earth.
Therefore, a screened 4-pole motor cable must be used and the screen must be connected
at both ends in accordance with the valid HF rules. The screening material (copper or steel) is less
important than good at both ends connection.
General connecting information:
1.) Power wiring with individual wires should always be
installed close to the corresponding PE conductor.
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