AKD 5000
Installation
■
Electrical installation, selection of EMC-
correct cables
Braided screened/armoured cables are recommended
to optimise EMC immunity of the control cables and
the EMC emission from the motor cables.
The ability of a cable to reduce the in- and outgoing
radiation of electric noise depends on the transfer
impedance (Z
T
). The screen of a cable is normally
designed to reduce the transfer of electric noise;
however, a screen with a lower transfer impedance
(Z
T
) value is more effective than a screen with a
higher transfer impedance (Z
T
).
Transfer impedance (Z
T
) is rarely stated by
cable manufacturers, but it is often possible to
estimate transfer impedance (Z
T
) by assessing
the physical design of the cable.
Transfer impedance (Z
T
) can be assessed on the
basis of the following factors:
-
The conductibility of the screen material.
-
The contact resistance between the individual
screen conductors.
-
The screen coverage, i.e. the physical area
of the cable covered by the screen - often
stated as a percentage value.
-
Screen type, i.e. braided or twisted pattern.
Aluminium-clad with copper wire.
Twisted copper wire or armoured steel wire cable.
Single-layer braided copper wire with varying
percentage screen coverage.
This is the typical Danfoss reference cable.
Double-layer braided copper wire.
Twin layer of braided copper wire with a magnetic,
screened/armoured intermediate layer.
Cable that runs in copper tube or steel tube.
Lead cable with 1.1 mm wall thickness.
MG.50.R3.02 -
33
Содержание AKD 5001
Страница 12: ...AKD 5000 Introduction Ordering form AKD 5000 Series Typecode MG 50 R3 02 11 ...
Страница 25: ...AKD 5000 Type F IP54 MG 50 R3 02 24 ...
Страница 29: ...AKD 5000 Compact IP 54 AKD 5001 5006 200 240 V AKD 5001 5011 380 500 V MG 50 R3 02 28 ...
Страница 33: ...AKD 5000 MG 50 R3 02 32 ...
