Electrical Installation, Control Cables - Danfoss VLT FCD 303 Operating Instructions Manual

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
Switches S101-104
Bus line coils, leave switches ON
MG.04.B7.02 - VLT is a registered Danfoss trademark
®
VLT FCD Series
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.
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