Electrical Installation, Control Cables - Danfoss VT2800 Series Design Manual

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VLT 2800 Series

Electrical installation, control cables

Control cables must be screened/armoured. The
screen must be connected to the frequency converter
chassis by means of a clamp. Normally, the screen
must also be connected to the chassis of the
controlling unit (use the instructions for the unit in
question). In connection with very long control cables
and analogue signals, in rare cases depending on
the installation, 50/60 Hz earth loops may occur
because of noise transmitted from mains supply
cables. In this connection, it may be necessary
to break the screen and possibly insert a 100 nF
capacitor between the screen and the chassis.
MG.28.E9.02 - VLT is a registered Danfoss trademark
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