Schneider Altivar 28 Manual De Usario página 61

Wiring
Wiring recommendations
Power
Observe the cable cross-sectional areas recommended in the standards.
The speed controller must be earthed, in order to comply with regulations concerning high leakage
currents (over 3.5 mA). When the use of an upstream "residual current device" for protection is required
by the installation standards, a "type B" device must be used, which will operate even in the presence of
DC components. If the installation has several speed controllers on the same line, each controller must
be earthed separately. If necessary, fit a line choke (consult the catalog).
Keep the power cables separate from circuits in the installation with low level signals (detectors, PLCs,
measuring apparatus, video, telephone).
Control
Keep the control circuits and the power cables apart. For control and speed reference circuits, we
recommend using shielded twisted cables with a pitch of between 25 and 50 mm, connecting the
shielding to ground at each end.
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