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VLT
®
5000 Series
■
Earthing of braided screened/armoured control
cables
Generally speaking, control cables must be braided
screened/armoured and the screen must be con-
nected by means of a cable clamp at both ends to
the metal cabinet of the unit.
The drawing below indicates how correct earthing is
carried out and what to be done if in doubt.
Correct earthing
Control cables and cables for serial communication
must be fitted with cable clamps at both ends to en-
sure the best possible electrical contact
Wrong earthing
Do not use twisted cable ends (pigtails), since these
increase the screen impedance at high frequencies.
Protection with respect to earth potential be-
tween PLC and VLT
If the earth potential between the VLT frequency
converter and the PLC (etc.) is different, electric
noise may occur that will disturb the whole system.
This problem can be solved by fitting an equalising
cable, to be placed next to the control cable. Mini-
mum cable cross-section: 16 mm
2
For 50/60 Hz earth loops
If very long control cables are used, 50/60 Hz earth
loops may occur. This problem can be solved by
connecting one end of the screen to earth via a
100nF capacitor (keeping leads short).
Cables for serial communication
Low-frequency noise currents between two VLT fre-
quency converters can be eliminated by connecting
one end of the screen to terminal 61. This terminal
is connected to earth via an internal RC link. It is
recommended to use twisted-pair cables to reduce
the differential mode interference between the con-
ductors.
MG.51.A1.02 - VLT is a registered Danfoss trade mark
58
Summary of Contents for ARIETE
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